SAKAMOTO KAZUYOSHI
| Emeritus Professor etc. | Emeritus Professor |
Researcher Information
Career
Educational Background
- 1970
東京教育大学大学院, 理学研究科, 化学専攻, Japan - 1967
The University of Electro-Communications, 電気通信学研究科, 通信機械工学専攻, Japan - 1967
The University of Electro-Communications, Graduate School, Division of Electro Communications - 1964
The University of Electro-Communications, Faculty of Electro-Communications, 電波通信学科, Japan - 1964
The University of Electro-Communications, Faculty of Electro Communications
Research Activity Information
MISC
- Cortical potentials associated with voluntary, reflex, and spontaneous blinks as bilateral simultaneous eyelid movement
Kenichi Kaneko; K. Mito; H. Makabe; M. Takanokura; K. Sakamoto
Movement-related cortical potentials (MRCPs) associated with the contraction of m. orbicularis oculi related to three types of blinks (voluntary, reflex, and spontaneous) were measured for 12 normal subjects. The purpose of the present study was to estimate the role of the cerebral cortex in close association with the blinks caused by bilateral simultaneous eyelid movements. MRCPs were recorded by surface electrodes placed over the frontal to the parietal regions. The mean amplitude and the duration of the MRCPs for the three types of blinks were evaluated by an averaging technique for each subject. MRCPs for the voluntary blinks were evoked in all subjects. For the reflex and the spontaneous blinks, however, a clear negative rising deflection from the baseline was not obtained. The maximum amplitude of the MRCPs for the voluntary blinks was localized at the vertex region, though there was no significant difference between the durations of the MRCPs for the vertex region and for the other regions. Moreover, the positive potential following the voluntary and the spontaneous blinks was recognized in the parietal region. These results suggest that only the voluntary blinks are caused by the neural activation of the supplementary motor area (SMA), and in addition, the neural activation related to visual recognition is considered to be elicited by the voluntary and the spontaneous blinks., Dec. 2004, Electromyography and Clinical Neurophysiology, 44, 8, 455-462, English, 0301-150X, 15646002, 11044236489 - Cortical potentials associated with voluntary, reflex, and spontaneous blinks as bilateral simultaneous eyelid movement
Kenichi Kaneko; K. Mito; H. Makabe; M. Takanokura; K. Sakamoto
Movement-related cortical potentials (MRCPs) associated with the contraction of m. orbicularis oculi related to three types of blinks (voluntary, reflex, and spontaneous) were measured for 12 normal subjects. The purpose of the present study was to estimate the role of the cerebral cortex in close association with the blinks caused by bilateral simultaneous eyelid movements. MRCPs were recorded by surface electrodes placed over the frontal to the parietal regions. The mean amplitude and the duration of the MRCPs for the three types of blinks were evaluated by an averaging technique for each subject. MRCPs for the voluntary blinks were evoked in all subjects. For the reflex and the spontaneous blinks, however, a clear negative rising deflection from the baseline was not obtained. The maximum amplitude of the MRCPs for the voluntary blinks was localized at the vertex region, though there was no significant difference between the durations of the MRCPs for the vertex region and for the other regions. Moreover, the positive potential following the voluntary and the spontaneous blinks was recognized in the parietal region. These results suggest that only the voluntary blinks are caused by the neural activation of the supplementary motor area (SMA), and in addition, the neural activation related to visual recognition is considered to be elicited by the voluntary and the spontaneous blinks., Dec. 2004, Electromyography and Clinical Neurophysiology, 44, 8, 455-462, English, 0301-150X, 15646002, 11044236489 - Development of a Mobility aid for the Visually Impaired Using Haptic Generator
Nov. 2004, Proceedings of The 5th International Conference on Machine Automation ICMA2004, 85-88 - ３種類の瞬目に関連する大脳皮質誘発電位の研究
Nov. 2004, 日本福祉工学会第７回大会論文講演集, 43-44 - 等尺性収縮時における測定位置と筋音図の関係
Nov. 2004, 日本福祉工学会第７回大会講演論文集, 41-42 - 生理的振戦による関節機能評価と関節傷害評価研究
Nov. 2004, 日本福祉工学会第７回大会講演論文集, 13-14 - 生理的振戦による膝関節機能の評価研究
Nov. 2004, 生体医工学, 42, 289 - Psychophysiological evaluation of simulator sickness evoked by a graphic simulator
BC Min; SC Chung; YK Min; K Sakamoto
The present study investigated the effects of simulator sickness, as an important bias factor on evaluation of emotional changes under the controlled condition of driving a car for 60 min at a constant speed (60 km/h) in a graphic simulator. Simulator sickness was measured and analyzed every 5 min using both subjective evaluation and physiological signals. Results of the subjective evaluation showed there was a significant difference between the rest and the driving conditions 10 min after the main experiment started and that the level of difference increased linearly with time. Analysis of the central and the autonomic nervous systems showed the significant differences in delta, theta, alpha and beta bands of an electroencephalogram (EEG), skin temperature, and the R-R interval between the rest and the driving conditions after about 5 min from the start of driving. In particular, there was the highest correlation between parameter of theta and subjective evaluation, and thus theta was considered an effective physiological parameter for numerically evaluating simulator sickness. The results indicate that physiological changes due to simulator sickness can be a bias factor in evaluation of human sensibility. (C) 2004 Elsevier Ltd. All rights reserved., ELSEVIER SCI LTD, Nov. 2004, APPLIED ERGONOMICS, 35, 6, 549-556, English, 0003-6870, 15374762, WOS:000224215900006 - Development of a Mobility aid for the Visually Impaired Using Haptic Generator
Nov. 2004, Proceedings of The 5th International Conference on Machine Automation ICMA2004, 85-88 - Psychophysiological evaluation of simulator sickness evoked by a graphic simulator
BC Min; SC Chung; YK Min; K Sakamoto
The present study investigated the effects of simulator sickness, as an important bias factor on evaluation of emotional changes under the controlled condition of driving a car for 60 min at a constant speed (60 km/h) in a graphic simulator. Simulator sickness was measured and analyzed every 5 min using both subjective evaluation and physiological signals. Results of the subjective evaluation showed there was a significant difference between the rest and the driving conditions 10 min after the main experiment started and that the level of difference increased linearly with time. Analysis of the central and the autonomic nervous systems showed the significant differences in delta, theta, alpha and beta bands of an electroencephalogram (EEG), skin temperature, and the R-R interval between the rest and the driving conditions after about 5 min from the start of driving. In particular, there was the highest correlation between parameter of theta and subjective evaluation, and thus theta was considered an effective physiological parameter for numerically evaluating simulator sickness. The results indicate that physiological changes due to simulator sickness can be a bias factor in evaluation of human sensibility. (C) 2004 Elsevier Ltd. All rights reserved., ELSEVIER SCI LTD, Nov. 2004, APPLIED ERGONOMICS, 35, 6, 549-556, English, 0003-6870, 15374762, WOS:000224215900006 - Discrimination of Materials by Dynamic Touch and Identification of its Parameters.
IKEDA Tomozumi; HASHIGUCHI Satoshi; MATSUDA Hideo; SHIOTA Yasuhito; SAKAMOTO Kazuyoshi; SHIMIZU Yutaka
The Society of Life Support Engineering, Sep. 2004, Journal of Life Support Technology, 16, 149-150, 1341-9455, 130001056073 - Can Complexity Analysis Evaluate the Severity of Parkinson Disease?
Jun. 2004, Proceedings of XVth ISEK (International Society of Electrophysiology and Kinesiology), 131 - Study of Muscle Function in Process of Fatigue Generated during Isometric Contraction and in Process of its Recovery with both Mechanomyogram (MMG) and Electromyogram (EMG)
Jun. 2004, Proceedings of XVth ISEK (International Society of Electrophysiology and Kinesiology), 102 - The Effect of the Height of Parallel Bars on Walking and Physical Movements
Jun. 2004, Proceedings of XVth ISEK (International Society of Electrophysiology and Kinesiology), 47 - Can Complexity Analysis Evaluate the Severity of Parkinson Disease?
Jun. 2004, Proceedings of XVth ISEK (International Society of Electrophysiology and Kinesiology), 131 - Study of Muscle Function in Process of Fatigue Generated during Isometric Contraction and in Process of its Recovery with both Mechanomyogram (MMG) and Electromyogram (EMG)
Jun. 2004, Proceedings of XVth ISEK (International Society of Electrophysiology and Kinesiology), 102 - The Effect of the Height of Parallel Bars on Walking and Physical Movements
Jun. 2004, Proceedings of XVth ISEK (International Society of Electrophysiology and Kinesiology), 47 - Electromyographic Study of Trunk Muscle Activity during Unresisted Twisting Posture in Various Twisting Angles
Apr. 2004, Electromyography and Clinical Neurophysiology, 44, 111-126 - Electromyographic Study of Trunk Muscle Activity during Unresisted Twisting Posture in Various Twisting Angles
Apr. 2004, Electromyography and Clinical Neurophysiology, 44, 111-126 - Analysis of mutual information content for EEG responses to odor stimulation for subjects classified by occupation
BC Min; SH Jin; IH Kang; DH Lee; JK Kang; ST Lee; K Sakamoto
To investigate the changes of cortico-cortical connectivity during odor stimulation of subjects classified by occupation, the mutual information content of EEGs was examined for general workers, perfume salespersons and professional perfume researchers. Analysis of the averaged-cross mutual information content (A-CMI) from the EEGs revealed that among the professional perfume researchers changes in the A-CMI values during odor stimulation were more apparent in the frontal region of the brain, while for the general workers and perfume salespersons such changes were more conspicuous in the overall posterior temporal, parietal and frontal regions. These results indicate that the brains of professional perfume researchers respond to odors mainly in the frontal region, reflecting the function of the orbitofrontal cortex (OFC) due to the occupational requirement of these subjects to discriminate or identify odors. During odor stimulation, the perfume salespersons, although relatively more exposed to odors than the general workers, showed similar changes to the general workers. The A-CMI value is in inverse proportion to psychological preferences of the professional perfume researchers and perfume salespersons, though this is not the case with the general workers. This result suggests that functional coupling for people who are occupationally exposed to odors may be related to psychological preference., OXFORD UNIV PRESS, Nov. 2003, CHEMICAL SENSES, 28, 9, 741-749, English, 0379-864X, WOS:000187220700001 - Analysis of mutual information content for EEG responses to odor stimulation for subjects classified by occupation
BC Min; SH Jin; IH Kang; DH Lee; JK Kang; ST Lee; K Sakamoto
To investigate the changes of cortico-cortical connectivity during odor stimulation of subjects classified by occupation, the mutual information content of EEGs was examined for general workers, perfume salespersons and professional perfume researchers. Analysis of the averaged-cross mutual information content (A-CMI) from the EEGs revealed that among the professional perfume researchers changes in the A-CMI values during odor stimulation were more apparent in the frontal region of the brain, while for the general workers and perfume salespersons such changes were more conspicuous in the overall posterior temporal, parietal and frontal regions. These results indicate that the brains of professional perfume researchers respond to odors mainly in the frontal region, reflecting the function of the orbitofrontal cortex (OFC) due to the occupational requirement of these subjects to discriminate or identify odors. During odor stimulation, the perfume salespersons, although relatively more exposed to odors than the general workers, showed similar changes to the general workers. The A-CMI value is in inverse proportion to psychological preferences of the professional perfume researchers and perfume salespersons, though this is not the case with the general workers. This result suggests that functional coupling for people who are occupationally exposed to odors may be related to psychological preference., OXFORD UNIV PRESS, Nov. 2003, CHEMICAL SENSES, 28, 9, 741-749, English, 0379-864X, WOS:000187220700001 - Analysis of Mutual Information Content of EEG in Stimuli of Order
Oct. 2003, Japanese Journal of smell and order, 10, 761-764 - 美術館における絵画とその複製絵画の印象評価研究
Oct. 2003, 第５回感性工学会, 213 - 色彩推論法を用いた色彩と形態の関連性の研究
Oct. 2003, 第５回感性工学会, 119 - ヘリウムガスによる負担軽減時の生理的振戦を用いた生体システムの機能評価
Oct. 2003, 第２４回バイオメカニズム学会（SOBIM 2003）, 713-716 - 筋音図による筋疲労回復過程の研究
Oct. 2003, 第２４回バイオメカニズム学会（SOBIM 2003）, 79-82 - 筋線維伝導速度を用いた動的運動時における筋機能評価
Oct. 2003, 第２４回バイオメカニズム学会(SOBIM 2003), 83-86 - Analysis of Mutual Information Content of EEG in Stimuli of Order
Oct. 2003, Japanese Journal of smell and order, 10, 761-764 - 上肢振戦による肩関節障害評価
Sep. 2003, 肩フォーラム, 37 - EMG characteristics of low back and lower limb muscles during forward bending posture
Kazuyoshi Sakamoto; Y. W. Swie
The study observed forward bending posture and evaluated its effect on muscular activity. The Muscular activity was monitored through the Electromyography (EMG). The objective was to extend the evaluation method of EMG due to muscular load in maintaining the posture and to investigate the existence of muscular coordination between low back and lower limb muscles during the posture. Twelve male subjects were asked to maintain the postures of six stages in bending angles from 0 to 180 degrees. The EMG of erector spinae (ES) at L1 and L5 levels, hamstrings, and gastrocnemius were recorded and analyzed by power spectral density. The characteristics of muscular activities were observed through the EMG power spectrum and the frequency. The activity changes were normalized by the relative presentation and the standardization. The relative presentation showed the level of activity changes in each posture by taking the activity during upright standing as a reference posture, and the standardization was applied to overcome the dependence of the power spectrum and the frequency upon the high standard deviation. A t test with the paired data was also applied to compare the values of EMG of the respective stages of the posture. The results showed that the activity of ES significantly increased during bending posture with an angle up to 45 degrees, and reached silent activity at 90 degrees of flexion. On the other hand, the activity of the hamstrings and gastrocnemius were recognized even when ES activity started and reached the silent activity. The lower limb muscles were considered to be always active during all stages of the posture, and they provided a greater contribution when the ES was in the silent activity., Sep. 2003, Electromyography and Clinical Neurophysiology, 43, 6, 335-347, English, 0301-150X, 14535046, 0042887602 - EMG characteristics of low back and lower limb muscles during forward bending posture
Kazuyoshi Sakamoto; Y. W. Swie
The study observed forward bending posture and evaluated its effect on muscular activity. The Muscular activity was monitored through the Electromyography (EMG). The objective was to extend the evaluation method of EMG due to muscular load in maintaining the posture and to investigate the existence of muscular coordination between low back and lower limb muscles during the posture. Twelve male subjects were asked to maintain the postures of six stages in bending angles from 0 to 180 degrees. The EMG of erector spinae (ES) at L1 and L5 levels, hamstrings, and gastrocnemius were recorded and analyzed by power spectral density. The characteristics of muscular activities were observed through the EMG power spectrum and the frequency. The activity changes were normalized by the relative presentation and the standardization. The relative presentation showed the level of activity changes in each posture by taking the activity during upright standing as a reference posture, and the standardization was applied to overcome the dependence of the power spectrum and the frequency upon the high standard deviation. A t test with the paired data was also applied to compare the values of EMG of the respective stages of the posture. The results showed that the activity of ES significantly increased during bending posture with an angle up to 45 degrees, and reached silent activity at 90 degrees of flexion. On the other hand, the activity of the hamstrings and gastrocnemius were recognized even when ES activity started and reached the silent activity. The lower limb muscles were considered to be always active during all stages of the posture, and they provided a greater contribution when the ES was in the silent activity., Sep. 2003, Electromyography and Clinical Neurophysiology, 43, 6, 335-347, English, 0301-150X, 14535046, 0042887602 - 立位姿勢時における前屈動作及び旋回動作の筋電図学的評価
坂本 和義; スウィユニアルト ウィジャヤ; 水戸 和幸; 高野 倉雅人; 閔 丙賛; 真壁 寿
Aug. 2003, 日本人間工学会誌, 39, 33-34, 0549-4974 - Evaluation of the Effect of Vim-thalamotomy by using Chaos Theory
Jul. 2003, 10th International Congress of Biomechanics, 253 - Evaluation of Muscular Function by Muscle Fiber Conduction Velocity during Static and Dynamic Contractions
Jul. 2003, 19th International Society of Biomechanics, 267 - Evaluation of the Effect of Vim-thalamotomy by using Chaos Theory
Jul. 2003, 10th International Congress of Biomechanics, 253 - Evaluation of Muscular Function by Muscle Fiber Conduction Velocity during Static and Dynamic Contractions
Jul. 2003, 19th International Society of Biomechanics, 267 - 味覚障害社の誘発脳波による評価
2003, 日本味と匂学会誌, 10, 597-600 - 香り刺激時の年齢差による脳波の非対称性の変化に関する研究
Dec. 2002, 日本味と匂学会誌, 9, 3, 635-638 - 前屈姿勢保持時の筋電図学的研究
Nov. 2002, 日本人間工学会関東支部会大３２回大会, 152-153 - The origins of physiological tremor as deduced from immersions of the finger in various liquids
M Takanokura; N Kokuzawa; K Sakamoto
To investigate the influence of gravity on physiological tremor during a holding stretch of the finger, tremor during immersion of the finger in liquids was measured. Liquids with various densities and various coefficients of viscosity were used. Tremor was detected using an acceleration sensor, and power spectrum analysis was performed on the acceleration signal of the tremor. The total power of the tremor spectrum decreased with an increase of the density and an increase of the coefficient of viscosity, the high frequency domain of the tremor spectrum showing a larger decrease than the low frequency domain. Linear regression analysis showed that the viscosity of the liquid had a larger effect on tremor than the buoyancy due to the liquid. A model was proposed for tremor during immersion of the finger in liquid. The effect of the buoyancy and the viscosity on tremor was examined using the proposed model. The origin of two frequency bands in the tremor spectrum was verified by both the immersion experiment and the proposed model. The stretch-reflex system via the spinal cord produced a high frequency band around 25 Hz, while the supraspinal system caused a low frequency band around 10 Hz. The neuromuscular function of the human body was evaluated using the amplitude and the frequency of tremor., SPRINGER-VERLAG, Nov. 2002, EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 88, 1-2, 29-41, English, 1439-6319, WOS:000179688100005 - Estimation of Surface Color with Use of Subjective Feeling: On the Influence of Contrast by Complementary Color
Nov. 2002, Korean Journal of the Science of Emotion & Sensitibity, 5, 73-78 - The origins of physiological tremor as deduced from immersions of the finger in various liquids
M Takanokura; N Kokuzawa; K Sakamoto
To investigate the influence of gravity on physiological tremor during a holding stretch of the finger, tremor during immersion of the finger in liquids was measured. Liquids with various densities and various coefficients of viscosity were used. Tremor was detected using an acceleration sensor, and power spectrum analysis was performed on the acceleration signal of the tremor. The total power of the tremor spectrum decreased with an increase of the density and an increase of the coefficient of viscosity, the high frequency domain of the tremor spectrum showing a larger decrease than the low frequency domain. Linear regression analysis showed that the viscosity of the liquid had a larger effect on tremor than the buoyancy due to the liquid. A model was proposed for tremor during immersion of the finger in liquid. The effect of the buoyancy and the viscosity on tremor was examined using the proposed model. The origin of two frequency bands in the tremor spectrum was verified by both the immersion experiment and the proposed model. The stretch-reflex system via the spinal cord produced a high frequency band around 25 Hz, while the supraspinal system caused a low frequency band around 10 Hz. The neuromuscular function of the human body was evaluated using the amplitude and the frequency of tremor., SPRINGER-VERLAG, Nov. 2002, EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 88, 1-2, 29-41, English, 1439-6319, WOS:000179688100005 - Estimation of Surface Color with Use of Subjective Feeling: On the Influence of Contrast by Complementary Color
Nov. 2002, Korean Journal of the Science of Emotion & Sensitibity, 5, 73-78 - 弾性負荷による生理的振戦の発生メカニズムの検討
Oct. 2002, 第２３回バイオメカニズム学術講演会, 219-222 - 色彩のフィーリング評価研究ー対比面積比の影響ー
Sep. 2002, 第４回日本感性工学会, 188 - Relationship between Maximal Oxygen Intake and Peripheral Circulatory Function Evaluated by Accelerated Plethysmogram in Women
Sep. 2002, Health Evaluation and Promotion, 28, 806-8-8 - Relationship between Maximal Oxygen Intake and Peripheral Circulatory Function Evaluated by Accelerated Plethysmogram in Women
Sep. 2002, Health Evaluation and Promotion, 28, 806-8-8 - Relationship between Frequency Components of Physiological Tremor and Elastic Load
Aug. 2002, 4th World Congress of Biomechanics - Relationship between Frequency Components of Physiological Tremor and Elastic Load
Aug. 2002, 4th World Congress of Biomechanics - Evaluation of musclar fatigue and the recovery with use of physiological tremor
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, pp. 337-338, (2002/6), 337-338 - Evaluation of the effect of vim-thalamotomy and its tremor control mechanism
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, 311-312 - Movement related cortical potentials associated with three kinds of blinks
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, 274-275 - Experimental and theoretical studies for distribution of muscle fiber conduction velocity
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, 240-241 - Evaluation of musclar fatigue and the recovery with use of physiological tremor
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, pp. 337-338, (2002/6), 337-338 - Evaluation of the effect of vim-thalamotomy and its tremor control mechanism
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, 311-312 - Movement related cortical potentials associated with three kinds of blinks
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, 274-275 - Experimental and theoretical studies for distribution of muscle fiber conduction velocity
Jun. 2002, XIVth Congress of the International Society of Electrophysiology and Kinesiology, Proceedings, 240-241 - Evaluation of Postural Tremor of Finger for Neuromuscular Disease and its Application to the Classification
Jun. 2002, Electromyography and Clinical Neurophysiology, 42, 205-218 - Estimation of Surface Color with Use of Subjective Feeling : On the Influence of Contrast by Complementary Color
May 2002, Proceeding of the 2002 Spring Conference of KOSES & The 3rd Korea-Japan International Symposium, 261-265 - Estimation of surface color with use of subjective feeling: On the influence of contrast by complementary color
May 2002, Proceeding of the 2002 Spring Conference of KOSES & The 3rd Korea-Japan International Symposium, 261-265 - Estimation of Surface Color with Use of Subjective Feeling : On the Influence of Contrast by Complementary Color
May 2002, Proceeding of the 2002 Spring Conference of KOSES & The 3rd Korea-Japan International Symposium, 261-265 - Estimation of surface color with use of subjective feeling: On the influence of contrast by complementary color
May 2002, Proceeding of the 2002 Spring Conference of KOSES & The 3rd Korea-Japan International Symposium, 261-265 - On the Evaluation of Muscle Fiber Conduction Velocity Considering Waveform Properties of an Electromyogram in M.Biceps Brachii during Voluntary Isometric Contraction
Apr. 2002, Electromyography and Clinical Neurophysiology, 42, 137-149 - Evaluation of postural tremor of finger for neuromuscular diseases and its application to the classification
H. Makabe; Kazuyoshi Sakamoto
The purpose of this study is to verify the features of the power spectrum of postural tremors for neuromuscular disease patients and to classify the postural tremors. The subjects were 88 neuromuscular disease patients (30 Parkinson disease (PD), 25 cerebellar disease (CER), 7 multiple sclerosis (MS), 7 neuropathy (NEU), 10 motor neuron disease (MND), 9 myopathy (MYO)). The control subjects were 12 normal young persons and 10 normal aged persons. Postural tremor was detected by accelerator sensor. Postural tremor was recorded under the two postural conditions: The subjects maintained the index finger without or with a weight load of 50g in a horizontal position while looking at a visual target in front of the tip of the index finger. The power spectrum was calculated by an auto-regressive model (AR model). The peak frequency and the peak power were evaluated under the two conditions. Two frequency components of 8-12 Hz and 20-25 Hz appeared in the postural tremor of both normal subjects and neuromuscular disease patients. The difference of the postural tremor between the subjects mainly appeared in the 8-12 Hz component during the postural tremor with a weight load. MYO patients belonged to one group (called as group P1) due to lower peak power, CER patients belonged to one group (called as group P2) due to higher peak power, and PD and MS patients belonged to one group (called as group P3) due to lower peak frequency and higher peak power. NER and MND patients belonged to one group (called as group N which meant normal group). These results suggested that the peak frequency and the peak power of the 8-12 Hz component were changed by the conditions of both spinal reflex system and central nervous system. An oscillator within the central nervous system produced the underlying frequency of 8-12 Hz component, while the amplitude of 8-12 Hz component was governed by both spinal reflex system and central nervous system. In conclusion, the classification of postural tremor for neuromuscular disease patients was a useful index to elucidate the mechanism of tremor oscillation and to assist in clinical diagnosis of neuromuscular disease., 2002, Electromyography and Clinical Neurophysiology, 42, 4, 205-218, English, 0301-150X, 12056336, 0036014459 - On the evaluation of muscle fiber conduction velocity considering waveform properties of an electromyogram in m. biceps brachii during voluntary isometric contraction
Kazuyoshi Mito; K. Sakamoto
The surface myoelectric signal during 20% maximum voluntary contraction was measured in m. biceps brachii using array electrodes for ten subjects in order to evaluate the distribution of muscle fiber conduction velocity (MFCV) in a whole muscle. MFCV was estimated by two calculating methods of the peak maximum method and the cross-correlation method from the myoelectric signals which were processed by techniques of the averaging and the non-averaging. It was found that the values of MFCV depended on the location irrespective of the kind of calculating method used and the kind of processing technique of myoelectric signal. In both the motor end-plate zone and the tendon zone, the values of MFCV showed more than 7.0 m/s. In the regions other than the motor end-plate zone and the tendon zone, the values of MFCV showed about 3.90 m/s which were almost constant. The statistical differences of the values of MFCV were in the same locations measured not recognized between the two calculating methods nor between the two processing techniques. In the cross-correlation method, the relation between MFCV and the electrode location was evaluated by both the maximum correlation coefficient and the amplitude ratio between the different neighboring channels to evaluate the conductive waveform properties of action potentials. The changes of parameters (i.e., MFCV, maximum correlation coefficient and amplitude ratio) depended on the electrode location. The values of MFCV significantly increased in the regions of the motor end-plate zone and the tendon zone, where the maximum correlation coefficient and amplitude ratio significantly decreased. The values of the coefficient of variance (CV) of three parameters in those regions were larger than those in other regions, i.e., the regions other than the motor end-plate zone and the tendon zone. A high maximum correlation coefficient and a high amplitude ratio were necessary for a reliable measurement of the MFCV., 2002, Electromyography and Clinical Neurophysiology, 42, 3, 137-149, English, 0301-150X, 11977427, 0036221194 - Influence of hyperbaric environment on physiological tremor
Kazuyoshi Sakamoto; N. Itakura; M. Takanokura; O. Kubota; K. Kaneko; K. Mito; N. Naraki; Y. Taya; M. Mohri
The effect of pressured environment from 1 to 24 ATA (Atmosphere Absolute) on total power spectrum (TP) of physiological tremor, whose value was the sum of power spectra for frequency range in 0.5 ~ 50Hz, was investigated. The main effects obtained were as follows. (1) In the case of 3 ATA, TP during the pressure holding period denoted a similar value as the value in 1 ATA. In the latter half of the period, the TP increased. When the pressured environment is 4 ATA, in which the partial pressure of the nitrogen gas was 3.6 ATA, the TP decreased during the pressure holding period compared with the value in 1 ATA. Nitrogen narcosis was recognized at the partial pressure of 3.6 ATA, thus the effect denoted a decrease of TP. (2) In the cases of 16 and 19 ATA using heliox gas, during the pressure holding period, TP decreased compared with the value in 1 ATA, but in the case of 24 ATA the value increased. The partial pressure of helium gas of 23.6 ATA indicated a high pressure nervous syndrome, therefore, the influence of high pressure on TP was recognized as one of the causes of the increase of TP. (3) The influence of inhibitors of the autonomic nervous system on TP during the pressure holding period of 3 ATA was recognized. After intake of the inhibitor for the parasympathetic nerve (atropine) during the pressure period, TP increased, while for the intake of the inhibitor for the sympathetic nerve (propanol), TP decreased., 2002, Electromyography and Clinical Neurophysiology, 42, 1, 7-16, English, 0301-150X, 11851012, 0036163405 - Autonomic responses of young passengers contingent to the speed and driving mode of a vehicle
Byung Chan Min; Soon Cheol Chung; Se Jin Park; Chul Jung Kim; Mi-Kyong Sim; Kazuyoshi Sakamoto
The purpose of the research was to measure the sensibility of young passengers through autonomic responses and subjective assessment under different speeds and driving modes of a vehicle. The study is composed of two categories: (1) measurement of the human sensibility at five speeds of a vehicle (i.e., 0, 30, 60, 90, and 120 km/h), and (2) three modes of driving conditions (i.e., rest, constant speed (60 km/h), sudden start, sudden stop). The physiological measurements used are autonomic responses of heart rate, galvanic skin response, and skin temperature, and the psychological measurement is the subjective assessment. Comparing the results of the pre-test with the post-test under various speed conditions, it was found that subjects feel tension under the high speed driving condition (120 km/h). The result of physiological signals also showed that as the speed of a car increased, the sympathetic nervous system of passengers became more highly activated. Comparing the rest and constant speed conditions with the sudden-start-sudden-stop condition, the subjects reported that they felt tension, and the responses of their autonomic nervous system also show that for the sudden-start-sudden-stop condition, the sympathetic nervous system was highly activated. The present study showed that depending on the speed of a vehicle and the driving mode, the human sensibilities change. It also showed that human sensibilities can be measured in an objective and systematical way as well as in the conventional and subjective way. Relevance to industry: If the relationship between human feelings or emotions and physiological and psychological parameters of a passenger or driver were clarified better, car designs could be developed based on the characteristics of human senses or feelings. © 2002 Elsevier Science B.V. All rights reserved., 2002, International Journal of Industrial Ergonomics, 29, 4, 187-198, English, 0169-8141, 80015178322, 0036181029 - Influence of hyperbaric environment on physiological tremor
Kazuyoshi Sakamoto; N. Itakura; M. Takanokura; O. Kubota; K. Kaneko; K. Mito; N. Naraki; Y. Taya; M. Mohri
The effect of pressured environment from 1 to 24 ATA (Atmosphere Absolute) on total power spectrum (TP) of physiological tremor, whose value was the sum of power spectra for frequency range in 0.5 ~ 50Hz, was investigated. The main effects obtained were as follows. (1) In the case of 3 ATA, TP during the pressure holding period denoted a similar value as the value in 1 ATA. In the latter half of the period, the TP increased. When the pressured environment is 4 ATA, in which the partial pressure of the nitrogen gas was 3.6 ATA, the TP decreased during the pressure holding period compared with the value in 1 ATA. Nitrogen narcosis was recognized at the partial pressure of 3.6 ATA, thus the effect denoted a decrease of TP. (2) In the cases of 16 and 19 ATA using heliox gas, during the pressure holding period, TP decreased compared with the value in 1 ATA, but in the case of 24 ATA the value increased. The partial pressure of helium gas of 23.6 ATA indicated a high pressure nervous syndrome, therefore, the influence of high pressure on TP was recognized as one of the causes of the increase of TP. (3) The influence of inhibitors of the autonomic nervous system on TP during the pressure holding period of 3 ATA was recognized. After intake of the inhibitor for the parasympathetic nerve (atropine) during the pressure period, TP increased, while for the intake of the inhibitor for the sympathetic nerve (propanol), TP decreased., 2002, Electromyography and Clinical Neurophysiology, 42, 1, 7-16, English, 0301-150X, 11851012, 0036163405 - Autonomic responses of young passengers contingent to the speed and driving mode of a vehicle
Byung Chan Min; Soon Cheol Chung; Se Jin Park; Chul Jung Kim; Mi-Kyong Sim; Kazuyoshi Sakamoto
The purpose of the research was to measure the sensibility of young passengers through autonomic responses and subjective assessment under different speeds and driving modes of a vehicle. The study is composed of two categories: (1) measurement of the human sensibility at five speeds of a vehicle (i.e., 0, 30, 60, 90, and 120 km/h), and (2) three modes of driving conditions (i.e., rest, constant speed (60 km/h), sudden start, sudden stop). The physiological measurements used are autonomic responses of heart rate, galvanic skin response, and skin temperature, and the psychological measurement is the subjective assessment. Comparing the results of the pre-test with the post-test under various speed conditions, it was found that subjects feel tension under the high speed driving condition (120 km/h). The result of physiological signals also showed that as the speed of a car increased, the sympathetic nervous system of passengers became more highly activated. Comparing the rest and constant speed conditions with the sudden-start-sudden-stop condition, the subjects reported that they felt tension, and the responses of their autonomic nervous system also show that for the sudden-start-sudden-stop condition, the sympathetic nervous system was highly activated. The present study showed that depending on the speed of a vehicle and the driving mode, the human sensibilities change. It also showed that human sensibilities can be measured in an objective and systematical way as well as in the conventional and subjective way. Relevance to industry: If the relationship between human feelings or emotions and physiological and psychological parameters of a passenger or driver were clarified better, car designs could be developed based on the characteristics of human senses or feelings. © 2002 Elsevier Science B.V. All rights reserved., 2002, International Journal of Industrial Ergonomics, 29, 4, 187-198, English, 0169-8141, 80015178322, 0036181029 - Study of Influence of Long Stay in Chamber under Atmospheric Pressure Environment on Physiological Function and Psychological State
Nov. 2001, Diving Physiological Panel, 91-96 - 異なる収縮形態の筋線維伝導速度（ＭＦＣＶ）の研究
Nov. 2001, 日本人間工学会関東支部会第３１回大会, 87-88 - 周波数解析を用いた Vim-Thalamotomy の効果判定
Nov. 2001, 第22回バイオメカニズム学術講演会, 209-212 - 電位伝搬情報を最優先した計算法におけるＭＦＣＶの部位特性
Nov. 2001, 第22回バイオメカニズム学術講演会, 175-178 - 上腕二頭筋における筋線維伝導速度分布と数理モデルによるメカニズ ムの解明
Nov. 2001, 第22回バイオメカニズム学術講演会, 171-174 - 異なる温度条件下における上腕二頭筋の筋電図と筋音図の特性
Nov. 2001, 第22回バイオメカニズム学術講演会, 163-166 - 生理的振戦による筋疲労とその回復の評価研究
Nov. 2001, 第22回バイオメカニズム学術講演会, 159-162 - 上肢の種々の部位の生理的振戦とその発生メカニズムの研究
Nov. 2001, 第22回バイオメカニズム学術講演会, 155-158 - Study of Influence of Long Stay in Chamber under Atmospheric Pressure Environment on Physiological Function and Pschological State
Nov. 2001, 16 th United State-Japan Cooperative Program in Natural Resources (UJNR) Diving Physiology Panel Meeting, 50 - Study of Influence of Long Stay in Chamber under Atmospheric Pressure Environment on Physiological Function and Psychological State
Nov. 2001, Diving Physiological Panel, 91-96 - Study of Influence of Long Stay in Chamber under Atmospheric Pressure Environment on Physiological Function and Pschological State
Nov. 2001, 16 th United State-Japan Cooperative Program in Natural Resources (UJNR) Diving Physiology Panel Meeting, 50 - Oculo-Manual Coordination Control under Various Conditions of Target Tracking Task
Oct. 2001, 3rd Conference on Sensorimotor Controls in Man and Machines, 25-26 - Effect of External Load on Physiological Tremor in Upper Limb
Oct. 2001, 3rd Conference on Sensorimotor Controls in Man and Machines, 34-35 - Oculo-Manual Coordination Control under Various Conditions of Target Tracking Task
Oct. 2001, 3rd Conference on Sensorimotor Controls in Man and Machines, 25-26 - Effect of External Load on Physiological Tremor in Upper Limb
Oct. 2001, 3rd Conference on Sensorimotor Controls in Man and Machines, 34-35 - 個人差フィーリングを考慮した色彩評価の方法の研究
Sep. 2001, 日本感性工学会、第３回大会予稿集, 195 - Mechanism of physiological tremor in upper limb and its application for evaluation of fatigue
TAKANOKURA Masato; MIYAMOTO Yasuhisa; SAKAMOTO Kazuyoshi
Sep. 2001, 日本人間工学会誌, 37, Supplement, 274-275, Japanese, 0549-4974, 80015790404, AN00199371 - 香り刺激による高齢者の生理・心理的影響
Sep. 2001, 日本味と匂学会誌, 8, 401-404 - 味覚障害者の誘発脳波による評価研究
Sep. 2001, 日本味と匂学会誌, 8, 47-480 - Mechanism of physiological tremor in upper limb and its application for evaluation of fatigue
TAKANOKURA Masato; MIYAMOTO Yasuhisa; SAKAMOTO Kazuyoshi
Sep. 2001, 日本人間工学会誌, 37, Supplement, 274-275, Japanese, 0549-4974, 80015790404, AN00199371 - Physiological tremor of the upper limb segments
M Takanokura; K Sakamoto
The acceleration signal produced by physiological tremor from four different upper limb segments (the finger, hand, forearm and upper limb) was measured by an acceleration sensor during holding posture and was analyzed by power spectrum analysis. Two prominent peaks appeared in the power spectrum, suggesting that the tremor in the four different limb segments was composed of two frequency components. The frequency of one peak at 8-12 Hz did not change between the different limb segments, while the frequency of the other peak decreased with the increase in the mass of the limb segment. A model with two reflex pathways was developed for the tremor in the four limb segments. The model includes two reflex pathways, a spinal pathway and a supraspinal pathway. The theoretical values of the frequency and the amplitude of the tremor predicted by the model were in good agreement with the experimental results. Analysis of the model revealed that one of the two frequency components of the tremor was of spinal origin and was dependent upon the mass of the limb segment, and the second was of supraspinal origin, corresponding to the frequency at 8-12 Hz. In the normal subject, it is possible that the tremor could be used to evaluate the change in neuromuscular function produced by prolonged work involving just part of a limb segments (e.g., typing). It may also be used to evaluate the neuromuscular function of patients suffering from neurological diseases such as muscular dystrophy and Parkinson's disease., SPRINGER-VERLAG, Aug. 2001, EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 85, 3-4, 214-225, English, 1439-6319, WOS:000170605300004 - Imaginary Motor Movement EEG Classification by Accumulative Auto-correlation-Pulse (AAP)
Aug. 2001, Electromyography and Clinical Neurophysiology, 41, 159-169 - t検定と判別分析を用いた視線文字入力インターフェースにおける誘発脳波の入力正誤判定の可能性
Aug. 2001, 第16回生体・生理工学シンポジウム論文集, 423-426 - EOGを用いた垂直方向注視領域判定の可能性
Aug. 2001, 第16回生体・生理工学シンポジウム論文集, 299-302 - Physiological tremor of the upper limb segments
M Takanokura; K Sakamoto
The acceleration signal produced by physiological tremor from four different upper limb segments (the finger, hand, forearm and upper limb) was measured by an acceleration sensor during holding posture and was analyzed by power spectrum analysis. Two prominent peaks appeared in the power spectrum, suggesting that the tremor in the four different limb segments was composed of two frequency components. The frequency of one peak at 8-12 Hz did not change between the different limb segments, while the frequency of the other peak decreased with the increase in the mass of the limb segment. A model with two reflex pathways was developed for the tremor in the four limb segments. The model includes two reflex pathways, a spinal pathway and a supraspinal pathway. The theoretical values of the frequency and the amplitude of the tremor predicted by the model were in good agreement with the experimental results. Analysis of the model revealed that one of the two frequency components of the tremor was of spinal origin and was dependent upon the mass of the limb segment, and the second was of supraspinal origin, corresponding to the frequency at 8-12 Hz. In the normal subject, it is possible that the tremor could be used to evaluate the change in neuromuscular function produced by prolonged work involving just part of a limb segments (e.g., typing). It may also be used to evaluate the neuromuscular function of patients suffering from neurological diseases such as muscular dystrophy and Parkinson's disease., SPRINGER-VERLAG, Aug. 2001, EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 85, 3-4, 214-225, English, 1439-6319, WOS:000170605300004 - Imaginary Motor Movement EEG Classification by Accumulative Auto-correlation-Pulse (AAP)
Aug. 2001, Electromyography and Clinical Neurophysiology, 41, 159-169 - Relation between Electrode Location and Muscle Fiber Conduction Velocity on M. Biceps Brachii Using cross-correlation Method
Jul. 2001, 18th International Congress of Biomechanics, 130-131 - Electromyographic Activity and Electro-ocugram Related to Spontaneous Blinks in Patients with Parkinson’s Disease.
Jul. 2001, 18th International Congress of Biomechanics, 133-134 - Paradoxical Phenomenon of Physiological Tremor in Prolonged Tapping Load
Jul. 2001, Electromyography and Clinical Neurophysiology, 14, 297-304 - ガイド領域を用いた視線文字入力インターフェースの提案
Jul. 2001, 電子情報通信学会論文誌, J84-D-II, 799-804 - 心筋興奮伝導シミュレーションにおける数理モデルのパラメータ感度
不破 輝彦; 坂本 和義
電気通信大学, Jul. 2001, 電気通信大学紀要, 14, 1, 39-46, Japanese, 0915-0935, 40004738041, AN10016842 - Evaluation of Vim-thalamotomy effect in Patients with Parkinson Disease and Essential Tremor due to Postural and Resting Tremor
Jul. 2001, 18th International Congress of Biomechanics, Book of Abstract, 134-135 - Relation between Electrode Location and Muscle Fiber Conduction Velocity on M. Biceps Brachii Using cross-correlation Method
Jul. 2001, 18th International Congress of Biomechanics, 130-131 - Electromyographic Activity and Electro-ocugram Related to Spontaneous Blinks in Patients with Parkinson’s Disease.
Jul. 2001, 18th International Congress of Biomechanics, 133-134 - Paradoxical Phenomenon of Physiological Tremor in Prolonged Tapping Load
Jul. 2001, Electromyography and Clinical Neurophysiology - Evaluation of Vim-thalamotomy effect in Patients with Parkinson Disease and Essential Tremor due to Postural and Resting Tremor
Jul. 2001, 18th International Congress of Biomechanics, Book of Abstract, 134-135 - Spontaneous Blinks of Parkinson’s Disease Patients Evaluated by EMG and EOG
Jun. 2001, Electromyography and Clinical Neurophysiology, 41, 87-95 - 心筋線維方向の回転を考慮した３次元興奮伝播モデルの高速計算法
May 2001, 医用電子と生体工学,特別号, 39, 607 - ガイド領域を用いた視線文字入力インターフェースの提案
May 2001, 電子情報通信学会論文誌ＤⅡ, J84-D-Ⅱ, 5, 799-804 - Imaginary motor movement EEG classification by accumulative-autocorrelation-pulse
I. V. Mayer; H. Takahashi; K. Sakamoto
Analysis of motor imaginary electroencephalogram (EEG) signals provide a feasible low-level communication channel for handicap people. We propose a classification method for imaginary right and left motor EEG using the Accumulative-Autocorrelation-Pulse (AAP) technique. This technique is based on the spatio-temporal pulse patterns generated from the accumulative autocorrelation values of selected electrodes in the ongoing EEG data. A feed forward neural network trained with the back propagation learning algorithm is used for classification. The network structure preserves and extracts the pulse-temporal feature patterns of the signal. Classification results reach 100% generalization accuracy in some single subjects and a 91% generalization over all subjects when the correct pair of electrodes are selected. Robust generalization results indicate that the autocorrelation nature of the human EEG signal contains typical patterns for classification in imaginary left and right motor events., Apr. 2001, Electromyography and Clinical Neurophysiology, 41, 3, 159-169, English, 0301-150X, 11402508, 0035017028 - Imaginary motor movement EEG classification by accumulative-autocorrelation-pulse
I. V. Mayer; H. Takahashi; K. Sakamoto
Analysis of motor imaginary electroencephalogram (EEG) signals provide a feasible low-level communication channel for handicap people. We propose a classification method for imaginary right and left motor EEG using the Accumulative-Autocorrelation-Pulse (AAP) technique. This technique is based on the spatio-temporal pulse patterns generated from the accumulative autocorrelation values of selected electrodes in the ongoing EEG data. A feed forward neural network trained with the back propagation learning algorithm is used for classification. The network structure preserves and extracts the pulse-temporal feature patterns of the signal. Classification results reach 100% generalization accuracy in some single subjects and a 91% generalization over all subjects when the correct pair of electrodes are selected. Robust generalization results indicate that the autocorrelation nature of the human EEG signal contains typical patterns for classification in imaginary left and right motor events., Apr. 2001, Electromyography and Clinical Neurophysiology, 41, 3, 159-169, English, 0301-150X, 11402508, 0035017028 - 心筋興奮伝導の３次元偏微分方程式高速計算法〜心筋線維方向の回転への対応〜
Mar. 2001, 電子情報通信学会技術研究報告,MBE2000-179, 117-124 - Study of Long Stay in Pressure Environment and Atmospheric Environment on Physiological and Psychological Functions.
Feb. 2001, Symposium on Shallow-water Saturation Diving,, 171-188 - Study of Long Stay in Pressure Environment and Atmospheric Environment on Physiological and Psychological Functions
Feb. 2001, Symposium on Shallow-water Saturation Diving, Proceedings, 171-188 - Spontaneous blinks as a criterion of visual fatigue during prolonged work on visual display terminals
K Kaneko; K Sakamoto
Visual fatigue caused by prolonged work viewing a Visual Display Terminals (VDT) and of work reading a hard-copy were assessed by electromyogram (EMG) waveform and electroculogram (EOG) waveform in spontaneous blinks as objective criteria, and by questionnaire of subjective feeling, and by task performance. The duration and the amplitude of the EMG of the orbicularis ocular muscle on the right side and the EOG of the vertical direction to the eyelid were measured for 10 subjects who participated in a figure task consisting of the addition of single-digit numbers on a VDT work or a work with a hard-copy. The mean values of the duration and the amplitude of the EMG and the EOG a ere evaluated by the averaging of 10 waveforms of the spontaneous blinks for all subjects. The time lag from the EMG to the EOG in the process of the generation of spontaneous blinks was also analyzed. These five parameters were evaluated during the work rime. The mean values for the duration of the EMG increased gradually during the work time, but the amplitude did not show significant difference between the prework and a work time. There was no significant change of the duration of the EOG, hut the mean amplitude of the EOG decreased as the work time progressed, and the time lag significantly extended. The blinks frequency increased relatively when using a VDT. The rate of fluctuation for these parameters was higher during use of a VDT than use of a hard-copy. The time lag at five hours of VDT work was extended by 90% based on the value at the pre-work . The symptoms of general fatigue and fatigue of the eyes increased linearly durinA the VDT a ork for six hours. The results indicated a significant correlation between the objective parameters for the activity of the spontaneous blinks, i.e., duration and amplitude of EMG and EGG. and the time lag between EMG and EGG, and the subjective feeling was recognized in the time course of the task. These experimental results suggested that the parameters regarding the EMG and the EOG for the spontaneous blinks were effective indices for assessing visual fatigue during prolonged VDT work., PERCEPTUAL MOTOR SKILLS, Feb. 2001, PERCEPTUAL AND MOTOR SKILLS, 92, 1, 234-250, English, 0031-5125, WOS:000167765600030 - Study of Long Stay in Pressure Environment and Atmospheric Environment on Physiological and Psychological Functions.
Feb. 2001, Symposium on Shallow-water Saturation Diving,, 171-188 - Study of Long Stay in Pressure Environment and Atmospheric Environment on Physiological and Psychological Functions
Feb. 2001, Symposium on Shallow-water Saturation Diving, Proceedings, 171-188 - Spontaneous blinks as a criterion of visual fatigue during prolonged work on visual display terminals
K Kaneko; K Sakamoto
Visual fatigue caused by prolonged work viewing a Visual Display Terminals (VDT) and of work reading a hard-copy were assessed by electromyogram (EMG) waveform and electroculogram (EOG) waveform in spontaneous blinks as objective criteria, and by questionnaire of subjective feeling, and by task performance. The duration and the amplitude of the EMG of the orbicularis ocular muscle on the right side and the EOG of the vertical direction to the eyelid were measured for 10 subjects who participated in a figure task consisting of the addition of single-digit numbers on a VDT work or a work with a hard-copy. The mean values of the duration and the amplitude of the EMG and the EOG a ere evaluated by the averaging of 10 waveforms of the spontaneous blinks for all subjects. The time lag from the EMG to the EOG in the process of the generation of spontaneous blinks was also analyzed. These five parameters were evaluated during the work rime. The mean values for the duration of the EMG increased gradually during the work time, but the amplitude did not show significant difference between the prework and a work time. There was no significant change of the duration of the EOG, hut the mean amplitude of the EOG decreased as the work time progressed, and the time lag significantly extended. The blinks frequency increased relatively when using a VDT. The rate of fluctuation for these parameters was higher during use of a VDT than use of a hard-copy. The time lag at five hours of VDT work was extended by 90% based on the value at the pre-work . The symptoms of general fatigue and fatigue of the eyes increased linearly durinA the VDT a ork for six hours. The results indicated a significant correlation between the objective parameters for the activity of the spontaneous blinks, i.e., duration and amplitude of EMG and EGG. and the time lag between EMG and EGG, and the subjective feeling was recognized in the time course of the task. These experimental results suggested that the parameters regarding the EMG and the EOG for the spontaneous blinks were effective indices for assessing visual fatigue during prolonged VDT work., PERCEPTUAL MOTOR SKILLS, Feb. 2001, PERCEPTUAL AND MOTOR SKILLS, 92, 1, 234-250, English, 0031-5125, WOS:000167765600030 - 誘発脳波による味覚障害者の味覚機能評価の研究
2001, 日本味と匂学会誌, 8, 477-480 - Paradoxical phenomenon of physiological tremor in prolonged tapping load
M. Takanokura; Y. Miyamoto; K. Sakamoto
Cumulative fatigue caused by a tapping load is investigated by power spectrum analysis of both physiological tremor of the finger and surface electromyogram (EMG) of the forearm muscle controlling the finger. A load for two hours at a rate of 200 taps/minute is performed on ten male subjects. The physiological tremor and the EMG are measured before and during the load. The measurement is performed under the isometric contraction at 10% maximum voluntary contraction in the m. flexor digitorum superficialis. The total power and the slow wave ratio of the power spectrum are evaluated. During the load, both spectra of the physiological tremor and the EMG show the maximum total power at 30 minutes after the load. The total powers of both spectra, however, decrease in the period after 60 minutes. Namely, the results of the physiological tremor and the EMG for prolonged load show the "paradox of fatigue." In order to elucidate the cause of the paradox of fatigue, the slow wave ratio of the EMG spectrum is studied. The ratio increases during the load. The muscle loaded indicates the state close to exhaustion, and the change of the function of the muscle contraction affects the amplitude of the physiological tremor. Therefore, the criterion judging muscular fatigue is denoted due to the change of the amplitude of the physiological tremor., 2001, Electromyography and Clinical Neurophysiology, 41, 5, 297-304, English, 0301-150X, 11572191, 0034850705 - Spontaneous Blinks of Parkinson's Disease Patients Evaluated by EMG and EOG
2001, Electromyography and Clinical Neurophysiology, 41, 87-95 - Spontaneous blinks of Parkinson's disease patients evaluated by EMG and EOG
K. Kaneko; K. Sakamoto
In a study of spontaneous blinks, both electromyographic (EMG) activities from m. orbicularis oculi which is responsible for initiating closure of the eyelid and electro-oculogram (EOG) of vertical direction to the movement of the eyelid were measured in ten patients with Parkinson's disease and in thirty normal subjects. The aim of this study was to evaluate the generative mechanism of the spontaneous blinks by comparison of both the EMG and the EOG waveforms in the patients with Parkinson's disease and those in the normal subjects. The mean duration and the amplitude of both the EMG and the EOG were evaluated by the averaging of ten waveforms for the spontaneous blinks. The time lag between the onset of the generation of the EMG and the onset of the EOG signal was analyzed. The mean duration of the EMG and the mean amplitude of both the EMG and the EOG in the patients with Parkinson's disease were shorter and smaller than those in the normal subjects by the significant level of 1%, respectively. There was no difference of the time lag between the subject groups. These results suggest that the function of m. orbicularis oculi for the spontaneous blinks is reduced in patients with Parkinson's disease, because the motoneurones of the facial neucleus innervating the m. orbicularis oculi becomes hypoactive due to abnormal output of basal ganglia., 2001, Electromyography and Clinical Neurophysiology, 41, 2, 87-95, English, 0301-150X, 11284060, 0035102473 - Paradoxical phenomenon of physiological tremor in prolonged tapping load
M. Takanokura; Y. Miyamoto; K. Sakamoto
Cumulative fatigue caused by a tapping load is investigated by power spectrum analysis of both physiological tremor of the finger and surface electromyogram (EMG) of the forearm muscle controlling the finger. A load for two hours at a rate of 200 taps/minute is performed on ten male subjects. The physiological tremor and the EMG are measured before and during the load. The measurement is performed under the isometric contraction at 10% maximum voluntary contraction in the m. flexor digitorum superficialis. The total power and the slow wave ratio of the power spectrum are evaluated. During the load, both spectra of the physiological tremor and the EMG show the maximum total power at 30 minutes after the load. The total powers of both spectra, however, decrease in the period after 60 minutes. Namely, the results of the physiological tremor and the EMG for prolonged load show the "paradox of fatigue." In order to elucidate the cause of the paradox of fatigue, the slow wave ratio of the EMG spectrum is studied. The ratio increases during the load. The muscle loaded indicates the state close to exhaustion, and the change of the function of the muscle contraction affects the amplitude of the physiological tremor. Therefore, the criterion judging muscular fatigue is denoted due to the change of the amplitude of the physiological tremor., 2001, Electromyography and Clinical Neurophysiology, 41, 5, 297-304, English, 0301-150X, 11572191, 0034850705 - Spontaneous blinks of Parkinson's disease patients evaluated by EMG and EOG
K. Kaneko; K. Sakamoto
In a study of spontaneous blinks, both electromyographic (EMG) activities from m. orbicularis oculi which is responsible for initiating closure of the eyelid and electro-oculogram (EOG) of vertical direction to the movement of the eyelid were measured in ten patients with Parkinson's disease and in thirty normal subjects. The aim of this study was to evaluate the generative mechanism of the spontaneous blinks by comparison of both the EMG and the EOG waveforms in the patients with Parkinson's disease and those in the normal subjects. The mean duration and the amplitude of both the EMG and the EOG were evaluated by the averaging of ten waveforms for the spontaneous blinks. The time lag between the onset of the generation of the EMG and the onset of the EOG signal was analyzed. The mean duration of the EMG and the mean amplitude of both the EMG and the EOG in the patients with Parkinson's disease were shorter and smaller than those in the normal subjects by the significant level of 1%, respectively. There was no difference of the time lag between the subject groups. These results suggest that the function of m. orbicularis oculi for the spontaneous blinks is reduced in patients with Parkinson's disease, because the motoneurones of the facial neucleus innervating the m. orbicularis oculi becomes hypoactive due to abnormal output of basal ganglia., 2001, Electromyography and Clinical Neurophysiology, 41, 2, 87-95, English, 0301-150X, 11284060, 0035102473 - 上肢振戦における負荷加重と負荷軽減の研究
Nov. 2000, 第21回バイオメカニズム学術講演会（SOBIM2000），講演予稿集, 427-430 - 手指における生理的振戦の発生メカニズムについて
Nov. 2000, 第21回バイオメカニズム学術講演会（SOBIM2000），講演予稿集, 423-426 - 相互相関法を用いた上腕二頭筋における筋線維伝導速度の分布特性の研究
Nov. 2000, 第21回バイオメカニズム学術講演会（SOBIM2000），講演予稿集, 401-404 - 瞬目によるVDT作業時の視覚疲労の研究
Oct. 2000, 第24回人間・生活環境系シンポジウム，報告集, 65-68 - 長時間タッピング作業時の生理的振戦による筋疲労評価
Oct. 2000, 第24回人間・生活環境系シンポジウム，報告集, 61-64 - 階段昇降時の衝撃加速度を用いた運動機能評価法に関する研究
Oct. 2000, 第24回人間・生活環境系シンポジウム，報告集, 53-56 - 身体発達
Sep. 2000, ぶんしん出版 - 関節運動中における筋電位伝搬パターンの推移とその特性
Jun. 2000, 日本生理人類学会第44回大会要旨集, 18-19 - 視線文字入力インターフェイスにおける誘発脳波の入力正誤判定に用いるための解析手法の検討
Jun. 2000, 日本生理人類学会第44回大会要旨集, 16-17 - 視線文字入力インターフェイスにおける誘発脳波での入力正誤判定の可能性
Jun. 2000, 日本生理人類学会第43回大会要旨集, 40-41 - 相関係数グラフ変化に着目した筋線維伝導速度（MFCV）の解析
Jun. 2000, 日本生理人類学会第43回大会要旨集, 38-39 - 心筋興奮伝導３次元偏微分方程式の高速計算法の開発
May 2000, 医用電子と生体工学，特別号, 38, 510 - 心筋興奮伝導３次元偏微分方程式の高速計算法の開発
May 2000, 第39回日本エム・イー学会 - Distribution of Muscle Fiber Conduction Velocity on M. Biceps Brachii Using Surface Array Electrodes and Model of Generation
Apr. 2000, The XIII Congress of International Society of Electrophysiology and Kinesiology（ISEK 2000） - Distribution of Muscle Fiber Conduction Velocity on M. Biceps Brachii Using Surface Array Electrodes and Model of Generation
Apr. 2000, The XIII Congress of International Society of Electrophysiology and Kinesiology（ISEK 2000） - 心筋興奮伝導偏微分方程式高速計算法の３次元モデルへの対応
Mar. 2000, 電子情報通信学会技術研究報告, MBE99-162, 7-12 - DIFFERENCE BETWEEN NON-INPUT AND INPUT FIXATIONS CONSIDERING SACCADIC INFORMATION
BAN Hisayuki; ITAKURA Naoaki; SAKAMOTO Kazuyoshi; KITAMOTO Hiraku
We proposed a new interface that have two areas. One is called the input area which is located on the right and left sides of the display. The orther is called the guide area which is located on the central part of the display. The guide area is useful for search of the position of a desired character. We could almost distinguish between non-input and input-fixations. However the distinction was not perfect. So we investigated characteristic of non-input and input fixations'duration, saccadic duration and saccadic amplitude. We also investigated the effect of the saccadic characters on distinction between non-input and input fixations. We found non-input and input fixations. were almost able to separate by their duration. We suggested that it was effective for the distinction to use the saccadic characters., Japan Society of Physiological Anthropology, Feb. 2000, Japanese Journal of Physiological Anthropology, 5, 1, 17-22, English, 110002510535, AN1052804X - 同一酸性度を有する溶液刺激による味覚誘発脳波の研究
2000, 日本味と匂学会誌, 7, 563-566 - Stimulation during slow and fast vehicular driving in graphic stimulator
2000, 日本味と匂学会誌, 7, 443-446 - Judgment of disability stages in Parkinson disease patients due to pathological tremor of index finger
H. Makabe; K. Sakamoto
The purpose of this study is to investigate the disability stages of Parkinson disease (PD) patients by wave analysis of parkinsonian pathological tremor. Physiological tremor and pathological tremor for the index finger are detected by accelerator sensor. The power spectrum is calculated by an auto-regressive model (AR model). The peak frequency and the peak power of the tremor for the index finger are evaluated under two conditions: (1) maintaining the index finger in a horizontal position using visual feedback with or without a weight load of 50 g, in which tremor is referred to as postural tremor, (2) resting the index finger with eyes closed, in which the tremor is referred to as resting tremor. The physiological tremor and the pathological tremor for the finger are characterized by two peak frequency components in which the first peak frequency component is 8-12 Hz, and the second is 20-25 Hz under the two conditions stated above. The peak frequency and the peak power for the PD patients at the two peak frequency components show the characteristics for the disability level of the PD patients. The first peak power especially around 8-12 Hz in the postural tremor without and with the weight load significantly increases as the disability stage determined by the Hoehn-Yahr method worsens, and there is significant difference of the peak powers for the stages. These results suggest that the first peak power around 8-12 Hz for the postural tremor without and with the weight load is a useful index to judge PD disability stage. It is found that postural tremor without and with the weight load gives the significant peak frequency and peak power compared with those for normal persons. It is pointed out that the first peak frequency component of 8-12 Hz originates from the central nervous system, and the first peak power reflects the degrees of disorder in the central nervous system, since PD is caused by the functional lowering of the central nervous system., 2000, Electromyography and Clinical Neurophysiology, 40, 7, 397-409, English, 0301-150X, 11142111, 0034529272 - Distribution of Muscular Fiber Condnction Velocity of M. Masseter during Voluntary Isometric Contraction
2000, Electromyogr. chin. Neurophysiol., 40, 275-285 - Muscular Fiber Conduction Velocity during Isometric Contraction and the Recovery Period
2000, Electromyogr. clin. Nenrophysiol., 40, 151-161 - Stimulation during slow and fast vehicular driving in graphic stimulator
2000, Japanese Journal of smell and order, 7, 443-446 - Judgement of Disability Stages in Parkinson Disease Patients due to Pathological Tremor of Index Finger
2000, Electromyography and Clinical Neurophysiology, 40, 397-409 - Distribution of Muscular Fiber Condnction Velocity of M. Masseter during Voluntary Isometric Contraction
2000, Electromyogr. chin. Neurophysiol., 40, 275-285 - Muscular Fiber Conduction Velocity during Isometric Contraction and the Recovery Period
2000, Electromyogr. clin. Nenrophysiol., 40, 151-161 - Influence of Hyperbaric Environment to Physiological Tremor
Dec. 1999, 15th UJNR Diving Physiology Panel - Influence of Hyperbaric Environment to Physiological Tremor
Dec. 1999, 15th UJNR Diving Physiology Panel - 液晶デイスプレイの表示特性が固視微動に及ぼす影響
Nov. 1999, 日本人間工学会関東支部会第29回大会，講演集, 112-113 - インタラクティブな視線入力インターフェースの実現
Oct. 1999, 日本生理人類学会第42回大会要旨集, 66-67 - The Validity of Spontaneous Blinks for Visual Workload Assessment
Sep. 1999, The 4th Asia-Pacific Conference on Medical & Biological Engineering, Proceedings, 410 - Influence of Location of Electrode on Muscle Fiber Conduction Velocity in Human Masseter Muscle
Sep. 1999, The 4th Asia-Pacific Conference on Medical & Biological Engineering, Proceedings, 271 - Effect of Buoyancy and Viscosity on Physiological Tremor of Finger
Sep. 1999, The 4th Asia-Pacific Conference on Medical & Biological Engineering, Proceedings, 155 - The Validity of Spontaneous Blinks for Visual Workload Assessment
Sep. 1999, The 4th Asia-Pacific Conference on Medical & Biological Engineering, Proceedings, 410 - Influence of Location of Electrode on Muscle Fiber Conduction Velocity in Human Masseter Muscle
Sep. 1999, The 4th Asia-Pacific Conference on Medical & Biological Engineering, Proceedings, 271 - Effect of Buoyancy and Viscosity on Physiological Tremor of Finger
Sep. 1999, The 4th Asia-Pacific Conference on Medical & Biological Engineering, Proceedings, 155 - Effect of Fitigue by Tapping Load on Spectrum Variation of Physiological Tremor of Finger
Aug. 1999, International Society of Biomechanics XVIIth Congress, Book of Abstract, 801 - Model of Generation of Muscle Fiber Conduction Velocity
Aug. 1999, International Society of Biomechanics XVIIth Congress, Book of Abstract, 786 - Study for Evaluation Technique of Muscle Fiber Conduction Velocity Using Correlation Coefficient
Aug. 1999, International Society of Biomechanics XVIIth Congress, Book of Abstract, 543 - Effect of Fitigue by Tapping Load on Spectrum Variation of Physiological Tremor of Finger
Aug. 1999, International Society of Biomechanics XVIIth Congress, Book of Abstract, 801 - Model of Generation of Muscle Fiber Conduction Velocity
Aug. 1999, International Society of Biomechanics XVIIth Congress, Book of Abstract, 786 - Study for Evaluation Technique of Muscle Fiber Conduction Velocity Using Correlation Coefficient
Aug. 1999, International Society of Biomechanics XVIIth Congress, Book of Abstract, 543 - Evaluation of spectral characteristics of physiological tremor of finger based on mechanical model
Masato Arihara; Kazuyoshi Sakamoto
A mathematical model for a physiological tremor of a finger, hereafter referred to as tremor, has been developed in order to evaluate the variation of amplitudes and frequencies at two peaks obtained in the power spectrum of the tremor under two conditions: (a) four loads of weight, 50, 100, 150, and 200g, are added to the finger (state of load of weight), and (b) the finger is held in a horizontal position with a weight of 200g for ten minutes (state of fatigue). The mathematical model for the tremor consists of a mechanical system of the finger and a reflex feedback system via the spinal and the supraspinal pathways. In the condition of the load of the weight, the two peaks shown in the tremor spectrum at about 10 Hz and 25 Hz under the condition of no load are generated by the existence of the spinal and the supraspinal pathways. The variation of the frequencies at the two peaks due to the load of the weight, which is not obtained by the previous model (Sakamoto et al., 1998), is possible to evaluate by use of the reflex feedback system which includes the terms up to the second order derivative. The amplitudes at the two peaks of the tremor spectrum increase with the additional weight on the finger because of the increase of the activity level of the active element of muscles controlling the finger. This element is one of the sub-systems constituting the tremor model. Because the activity level of the active element corresponds to the contraction force produced by the muscles, the increase of the amplitudes at the two peaks results from the progress of the recruitment of the motor unit activity by the addition of the weight. The term presenting the activity level is here introduced in the tremor model, so that the phenomenon is found. In the condition of the state of fatigue, the amplitudes at the two peaks increase with the progress of the fatigue because the active element is presented as a function of the time course, so that the activity level of the active element increases with the time course. The increase of the activity level implies the progresses of the recruitment and synchronization of the motor unit activity due to the fatigue. These results obtained from the analysis of the tremor model verify the hypothesis that the amplitude of the tremor oscillation is attributable to the changes of the activity of the spinal and the supraspinal systems., Jul. 1999, Electromyography and Clinical Neurophysiology, 39, 5, 289-304, English, 0301-150X, 10422000, 0032994786 - Evaluation of spectral characteristics of physiological tremor of finger based on mechanical model
Masato Arihara; Kazuyoshi Sakamoto
A mathematical model for a physiological tremor of a finger, hereafter referred to as tremor, has been developed in order to evaluate the variation of amplitudes and frequencies at two peaks obtained in the power spectrum of the tremor under two conditions: (a) four loads of weight, 50, 100, 150, and 200g, are added to the finger (state of load of weight), and (b) the finger is held in a horizontal position with a weight of 200g for ten minutes (state of fatigue). The mathematical model for the tremor consists of a mechanical system of the finger and a reflex feedback system via the spinal and the supraspinal pathways. In the condition of the load of the weight, the two peaks shown in the tremor spectrum at about 10 Hz and 25 Hz under the condition of no load are generated by the existence of the spinal and the supraspinal pathways. The variation of the frequencies at the two peaks due to the load of the weight, which is not obtained by the previous model (Sakamoto et al., 1998), is possible to evaluate by use of the reflex feedback system which includes the terms up to the second order derivative. The amplitudes at the two peaks of the tremor spectrum increase with the additional weight on the finger because of the increase of the activity level of the active element of muscles controlling the finger. This element is one of the sub-systems constituting the tremor model. Because the activity level of the active element corresponds to the contraction force produced by the muscles, the increase of the amplitudes at the two peaks results from the progress of the recruitment of the motor unit activity by the addition of the weight. The term presenting the activity level is here introduced in the tremor model, so that the phenomenon is found. In the condition of the state of fatigue, the amplitudes at the two peaks increase with the progress of the fatigue because the active element is presented as a function of the time course, so that the activity level of the active element increases with the time course. The increase of the activity level implies the progresses of the recruitment and synchronization of the motor unit activity due to the fatigue. These results obtained from the analysis of the tremor model verify the hypothesis that the amplitude of the tremor oscillation is attributable to the changes of the activity of the spinal and the supraspinal systems., Jul. 1999, Electromyography and Clinical Neurophysiology, 39, 5, 289-304, English, 0301-150X, 10422000, 0032994786 - ガイド方式の視線入力インターフェイスにおける入力判定法の提案
Jun. 1999, 日本生理人類学会41回大会，抄録集, 43-44 - 神経筋接合部付近のMFCV（筋線維伝導速度）の解析
Jun. 1999, 日本生理人類学会41回大会，抄録集, 45-46 - 相関次元による視覚事象関連電位の解析
Jun. 1999, 日本生理人類学会41回大会，抄録集, 43-44 - 液体中の生理的振戦―浮力と粘性の効果について―
Jun. 1999, 日本生理人類学会41回大会，抄録集, 41-42 - Contribution of motor unit activity enhanced by acute fatigue to physiological tremor of finger
M. Arihara; K. Sakamoto
The contribution of motor unit activity to a physiological tremor (hereafter called as tremor) in a middle finger is studied by both a power spectrum and a correlation analysis in which the correlation coefficient and the coherence spectrum are obtained when five kinds of loads, 0, 50, 100, 150, and 200 g, are added to the middle finger for two minutes in a loading experiment on twelve male subjects. A weight of 200 g is applied to the subjects for ten minutes in a fatigue experiment. Throughout both experiments, the middle finger remains stretched from the load of the weight. The tremor is measured by an accelerometer (MT-3T, Nihon Kohden, Japan) attached to the middle finger, and the surface electromyogram (EMG) is measured by bipolar electrodes placed on m. extensor digitorum communis. A power spectrum analysis is carried out on the tremor and EMG, and a correlation analysis is performed on the relationship between the tremor and the demodulated EMG. It is found in the loading experiment that when the weight on the finger increases, the amplitude of the tremor oscillation increases since the activity of the motor units of the muscle is enhanced by the phenomenon of recruitment. Two frequency components of the tremor spectra at 10 Hz and 25 Hz under a no load condition reflect the components of the activity of the motor units of the muscle because the tremor shows a significant correlation in the frequency zone of 10 Hz and 25 Hz with the demodulated EMG. The lower frequency component of the tremor spectrum at 10 Hz results in synchronized activity of the motor units, while the higher frequency at 25 Hz occurs from the stretch reflex loop via the motoneurons of the spinal cord. The shift of the higher frequency component to the lower frequency domain due to the load of the weight originates from the prolongation of the response time of the finger mechanical system because the lag time at the peak of the correlation coefficient increases with the load of the weight. It is found in the fatigue experiment that the amplitude of the tremor oscillation increases with the progress of fatigue. The increase is caused by the recruitment of the motor unit activity of the muscle holding the finger as well as by the synchronization of the firings of the motoneurons. The progress of the synchronization is verified by the fact that the mean power frequency (MPF) of the EMG spectrum decreases and the correlation between the tremor and the demodulated EMG increases with the progress of fatigue. The mechanisms of the increase of the amplitude of the tremor oscillation under the load of the weight to the finger and under the state of fatigue of the finger are elucidated by the analysis of the tremor and EMG., Jun. 1999, Electromyography and Clinical Neurophysiology, 39, 4, 235-247, English, 0301-150X, 10394509, 0033067864 - Evaluation of three types of blinks with the use of electro-oculogram and electromyogram
K Kaneko; K Sakamoto
Three kinds of blinks, spontaneous, reflex, and voluntary, were measured fur 11 men using electromyogram (EMG) at the orbicularis oculi muscle on the right side and electro-oculogram (EOG) in the vertical direction to the right eyelid. The amplitude and the duration time were defined here from the raw waves of the EMG and the: EOG for the three kinds of blinks. The amplitude of the EMG indicated that the mean value for the spontaneous blinks was significantly smaller than that of the voluntary blinks and the mean duration of die EMG shows the value for the spontaneous blinks was smaller than that for the reflex and the voluntary blinks. The EMG for the spontaneous blinks had a smaller amplitude and a shorter duration time than the other blinks. The LOG amplitude indicated that the mean value for the spontaneous blinks uas significantly smaller than that for the voluntary blinks, but there was no significant difference between the spontaneous blinks and the other blinks for the duration of the EGG. The amplitude and the duration for both the EMG and the LOG discriminated any two types of blinks from three blinks by statistical rest. Those values for the EMG and the EOG are effective indices for the evaluation of blinks. Moreover, the coefficients of variation of the amplitude and durations of EMG and EOG for three kinds of blinks denote their characteristics. Multiple discriminant analysis distinguished the types of blinks simultaneously: The resultant maximum correct rare for the three blinks reaches to be 81.8%. So far, it has been difficult to discriminate the blinks quantitatively, but the procedures present ed here are able to solve the difficulty., PERCEPTUAL MOTOR SKILLS, Jun. 1999, PERCEPTUAL AND MOTOR SKILLS, 88, 3, 1037-1052, English, 0031-5125, WOS:000081127100042 - Contribution of motor unit activity enhanced by acute fatigue to physiological tremor of finger
M. Arihara; K. Sakamoto
The contribution of motor unit activity to a physiological tremor (hereafter called as tremor) in a middle finger is studied by both a power spectrum and a correlation analysis in which the correlation coefficient and the coherence spectrum are obtained when five kinds of loads, 0, 50, 100, 150, and 200 g, are added to the middle finger for two minutes in a loading experiment on twelve male subjects. A weight of 200 g is applied to the subjects for ten minutes in a fatigue experiment. Throughout both experiments, the middle finger remains stretched from the load of the weight. The tremor is measured by an accelerometer (MT-3T, Nihon Kohden, Japan) attached to the middle finger, and the surface electromyogram (EMG) is measured by bipolar electrodes placed on m. extensor digitorum communis. A power spectrum analysis is carried out on the tremor and EMG, and a correlation analysis is performed on the relationship between the tremor and the demodulated EMG. It is found in the loading experiment that when the weight on the finger increases, the amplitude of the tremor oscillation increases since the activity of the motor units of the muscle is enhanced by the phenomenon of recruitment. Two frequency components of the tremor spectra at 10 Hz and 25 Hz under a no load condition reflect the components of the activity of the motor units of the muscle because the tremor shows a significant correlation in the frequency zone of 10 Hz and 25 Hz with the demodulated EMG. The lower frequency component of the tremor spectrum at 10 Hz results in synchronized activity of the motor units, while the higher frequency at 25 Hz occurs from the stretch reflex loop via the motoneurons of the spinal cord. The shift of the higher frequency component to the lower frequency domain due to the load of the weight originates from the prolongation of the response time of the finger mechanical system because the lag time at the peak of the correlation coefficient increases with the load of the weight. It is found in the fatigue experiment that the amplitude of the tremor oscillation increases with the progress of fatigue. The increase is caused by the recruitment of the motor unit activity of the muscle holding the finger as well as by the synchronization of the firings of the motoneurons. The progress of the synchronization is verified by the fact that the mean power frequency (MPF) of the EMG spectrum decreases and the correlation between the tremor and the demodulated EMG increases with the progress of fatigue. The mechanisms of the increase of the amplitude of the tremor oscillation under the load of the weight to the finger and under the state of fatigue of the finger are elucidated by the analysis of the tremor and EMG., Jun. 1999, Electromyography and Clinical Neurophysiology, 39, 4, 235-247, English, 0301-150X, 10394509, 0033067864 - Evaluation of Physiological Tremor for Neuromuscular Diseases and its Application to Classification
May 1999, 13th International Congress of the World Confederation for Physical Therapy, Proceedings, 124 - 生理的振戦と筋電図を用いた筋疲労評価の研究
在原 雅人; 宮本 靖久; 坂本 和義
May 1999, 日本人間工学会, 35, 398-399, 0549-4974, 10009795984 - Evaluation of muscular function in process of muscular fatigue and its recovery with use of muscle fiber conduction velocity
SAKAMOTO Kazuyoshi; MITO Kazuyuki
May 1999, 日本人間工学会, 35, 396-397, Japanese, 0549-4974, 10009795980, AN00199371 - Evaluation of Physiological Tremor for Neuromuscular Diseases and its Application to Classification
May 1999, 13th International Congress of the World Confederation for Physical Therapy, Proceedings, 124 - ２次元心筋興奮伝導の高速計算法の改良
Mar. 1999, 電子情報通信学会技術研究報告, MBE-98-158, 131-138 - Post-tetanic potentiation of reciprocal Ia inhibition in human lower limb
T Sato; T Tsuboi; M Miyazaki; K Sakamoto
The purpose of this study was to investigate how reciprocal Ia inhibition is changed during muscle fatigue of lower limb muscle, induced with a voluntary contraction or height frequency electrical stimulation Reciprocal Ia inhibition from ankle flexors to extensors has been investigated in 12 healthy subjects. Hoffmann reflex (H-reflex) in the soleus muscle was used to monitor changes in the amount of reciprocal Ia inhibition from common peroneal nerve as demonstrated during voluntary dorsi or planterflexion and 50 Hz electrical stimulation induced dorsi or planterflexion. The test soleus H-reflex was kept at 20-25% of maximum directly evoked motor response (M response) and the strength of the conditioning common peroneal nerve stimulation was kept at 1.0 x motor threshold. At rest, weak Ia inhibition was demonstrated in IZ subjects, maximal inhibition from the common peroneal nerve was 28.8%. During voluntary dorsiflexion and 50 Hz electrical stimulation induced dorsiflexion, there absolute amounts of inhibition increased as compared to at rest, and decreased or disappeared during voluntary planterflexion and 50 Hz electrical stimulation induced planterflexion as compared to at rest. During voluntary or electrical stimulation induced agonist muscle fatigue, the inhibition of the soleus H-reflex from the common peroneal nerve was greater during voluntary dorsiflexion (maximal, 11.1%) and 50 Hz (maximal, 6.7%) electrical stimulation induced dorsiflexion than at rest. The inhibition was decreased or disappeared during voluntary planterflexion 50 Hz electrical stimulation induced planterflexion. it was concluded that the results were considered to support the hypothesis that alpha-motoneurones and Ia inhibitory interneurones link to antagonist motoneurones in reciprocal inhibition. The diminished reciprocal Ia inhibition of voluntary contraction during muscle fatigue as compared to electrical stimulation, is discussed in relation to its possible contribution to ankle stability. (C) 1999 Elsevier Science Ltd. All rights reserved., ELSEVIER SCI LTD, Feb. 1999, JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY, 9, 1, 59-66, English, 1050-6411, WOS:000078182700006 - Post-tetanic potentiation of reciprocal Ia inhibition in human lower limb
T Sato; T Tsuboi; M Miyazaki; K Sakamoto
The purpose of this study was to investigate how reciprocal Ia inhibition is changed during muscle fatigue of lower limb muscle, induced with a voluntary contraction or height frequency electrical stimulation Reciprocal Ia inhibition from ankle flexors to extensors has been investigated in 12 healthy subjects. Hoffmann reflex (H-reflex) in the soleus muscle was used to monitor changes in the amount of reciprocal Ia inhibition from common peroneal nerve as demonstrated during voluntary dorsi or planterflexion and 50 Hz electrical stimulation induced dorsi or planterflexion. The test soleus H-reflex was kept at 20-25% of maximum directly evoked motor response (M response) and the strength of the conditioning common peroneal nerve stimulation was kept at 1.0 x motor threshold. At rest, weak Ia inhibition was demonstrated in IZ subjects, maximal inhibition from the common peroneal nerve was 28.8%. During voluntary dorsiflexion and 50 Hz electrical stimulation induced dorsiflexion, there absolute amounts of inhibition increased as compared to at rest, and decreased or disappeared during voluntary planterflexion and 50 Hz electrical stimulation induced planterflexion as compared to at rest. During voluntary or electrical stimulation induced agonist muscle fatigue, the inhibition of the soleus H-reflex from the common peroneal nerve was greater during voluntary dorsiflexion (maximal, 11.1%) and 50 Hz (maximal, 6.7%) electrical stimulation induced dorsiflexion than at rest. The inhibition was decreased or disappeared during voluntary planterflexion 50 Hz electrical stimulation induced planterflexion. it was concluded that the results were considered to support the hypothesis that alpha-motoneurones and Ia inhibitory interneurones link to antagonist motoneurones in reciprocal inhibition. The diminished reciprocal Ia inhibition of voluntary contraction during muscle fatigue as compared to electrical stimulation, is discussed in relation to its possible contribution to ankle stability. (C) 1999 Elsevier Science Ltd. All rights reserved., ELSEVIER SCI LTD, Feb. 1999, JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY, 9, 1, 59-66, English, 1050-6411, WOS:000078182700006 - 個人差フィーリングに基づく色彩評価方法の研究
Jan. 1999, 第４回『印象の工学』ワークショップ，予稿集, 215-218 - Evaluation of three types of blinks with the use of electro-oculogram and electromyogram
Kenichi Kaneko; Kazuyoshi Sakamoto
Three kinds of blinks, spontaneous, reflex, and voluntary, were measured for 11 men using electromyogram (EMG) at the orbicularis oculi muscle on the right side and electro-oculogram (EOG) in the vertical direction to the right eyelid. The amplitude and the duration time were defined here from the raw waves of the EMG and the EOG for the three kinds of blinks. The amplitude of the EMG indicated that the mean value for the spontaneous blinks was significantly smaller than that of the voluntary blinks and the mean duration of the EMG shows the value for the spontaneous blinks was smaller than that for the reflex and the voluntary blinks. The EMG for the spontaneous blinks had a smaller amplitude and a shorter duration time than the other blinks. The EOG amplitude indicated that the mean value for the spontaneous blinks was significantly smaller than that for the voluntary blinks, but there was no significant difference between the spontaneous blinks and the other blinks for the duration of the EOG. The amplitude and the duration for both the EMG and the EOG discriminated any two types of blinks from three blinks by statistical test. Those values for the EMG and the EOG are effective indices for the evaluation of blinks. Moreover, the coefficients of variation of the amplitude and durations of EMG and EOG for three kinds of blinks denote their characteristics. Multiple discriminant analysis distinguished the types of blinks simultaneously. The resultant maximum correct rate for the three blinks reaches to be 81.8%. So far, it has been difficult to discriminate the blinks quantitatively, but the procedures presented here are able to solve the difficulty., Dr. C.H. Ammons, 1999, Perceptual and Motor Skills, 88, 3, 1037-1052, English, 0031-5125, 10407913, 0033143577 - Evaluation of involuntary eys movement in VDT work environment
Dec. 1998, Second International Conference on Human-Environment System,Proceedings, 354-357 - Analysis of eys movements for eye-gaze input interface with guide area locating position of character
Dec. 1998, Second International Conference on Human-Environment System, Proceedings, 448-449 - A study of mechanism of physiological tremor and its application to evaluation of fatigue for holding function of finger
Dec. 1998, Second International Conference on Human-Environment System, Proceedings, 444-447 - Evaluation of involuntary eys movement in VDT work environment
Dec. 1998, Second International Conference on Human-Environment System,Proceedings, 354-357 - Analysis of eys movements for eye-gaze input interface with guide area locating position of character
Dec. 1998, Second International Conference on Human-Environment System, Proceedings, 448-449 - A study of mechanism of physiological tremor and its application to evaluation of fatigue for holding function of finger
Dec. 1998, Second International Conference on Human-Environment System, Proceedings, 444-447 - 相互相関法の最大相関係数値を考慮した筋線維伝導速度の推定
Nov. 1998, 日本生理人類学会第40回大会，抄録集, 82 - 定常電流源双極子モデルを用いた筋線維伝導速度の研究
Nov. 1998, 日本生理人類学会第40回大会，抄録集, 81 - 自発性瞬目を指標とした長時間VDT作業による視覚疲労の研究
Nov. 1998, 日本生理人類学会第40回大会，抄録集, 55 - 生理的振戦における上位中枢と脊髄機能の役割
Nov. 1998, 日本生理人類学会第40回大会，抄録集, 54 - ガイド領域を用いた視線入力インターフェイスにおける注視点算出方法の考察
Nov. 1998, 日本生理人類学会第40回大会，抄録集, 48 - 味覚修飾物質による基本四味の誘発脳波の研究
Oct. 1998, 第32回日本味と匂学会，予稿集, 60 - On the relationship between visual fatigue and spontaneous blinks in VDT work
Oct. 1998, Second Congress of Korea and Japan Ergonomics,Proceedings, 569-573 - Studies of evoled potentials induced by stimulus of four basic tastes under the influence of taste modifiers
Oct. 1998, Second Congress ofKorea and Japan Ergonomics, Proceedings, 565-568 - Classification of neuromuscular diseases by pathological tremor
Oct. 1998, Second Congress of Korea and Japan Ergonomics, Proceedings, 561-564 - Application of physiological tremor to evaluation of fatigue for holding function of finger
Oct. 1998, Second Congress of Korea and JapanErgonomics, Proceedings, 557-560 - A test of gustatory brain evoked potentials generated by taste stimuli
Oct. 1998, Second Congress of Korea andJapan Ergonomics, Proceedings, 413-421 - Experimental and theoretical studies of muscle fiber conduction vilocity
Oct. 1998, Second Congress of Korea and Japan Ergonomics, Proceedings, 552-556 - Various problems in evaluation of physiological and psychological functions in VDT works
Oct. 1998, Second Congress of Korea and JapanErgonomics, 41-53 - On the spontaneous blinks during VDT work for hours
Oct. 1998, Second International Conference on Psychophysiology in Erogonomics. Proceedingsof PIE '98, 104-105 - On the relationship between visual fatigue and spontaneous blinks in VDT work
Oct. 1998, Second Congress of Korea and Japan Ergonomics,Proceedings, 569-573 - Studies of evoled potentials induced by stimulus of four basic tastes under the influence of taste modifiers
Oct. 1998, Second Congress ofKorea and Japan Ergonomics, Proceedings, 565-568 - Classification of neuromuscular diseases by pathological tremor
Oct. 1998, Second Congress of Korea and Japan Ergonomics, Proceedings, 561-564 - Application of physiological tremor to evaluation of fatigue for holding function of finger
Oct. 1998, Second Congress of Korea and JapanErgonomics, Proceedings, 557-560 - A test of gustatory brain evoked potentials generated by taste stimuli
Oct. 1998, Second Congress of Korea andJapan Ergonomics, Proceedings, 413-421 - Experimental and theoretical studies of muscle fiber conduction vilocity
Oct. 1998, Second Congress of Korea and Japan Ergonomics, Proceedings, 552-556 - Various problems in evaluation of physiological and psychological functions in VDT works
Oct. 1998, Second Congress of Korea and JapanErgonomics, 41-53 - On the spontaneous blinks during VDT work for hours
Oct. 1998, Second International Conference on Psychophysiology in Erogonomics. Proceedingsof PIE '98, 104-105 - 神経筋疾患における病理的振戦の研究
Sep. 1998, 第14回バイオメカニクス学会，抄録集, 70 - 視覚機能評価のための固視微動（ドリフト）のウエーブレット解析
坂本 和義; 大山 努
May 1998, 日本人間工学会誌, 34, Supplement, 342-343, 0549-4974 - 複雑な虚血領域設定が可能な心筋興奮伝導シミュレーションシステム
May 1998, 第37回日本エム・イー学会（医用電子と生体工学, 36, 676 - 視覚機能評価のための固視微動（ドリフト）のウエーブレット解析
坂本 和義; 大山 努
May 1998, 人間工学会誌, 34, Supplement, 342-343, 0549-4974 - Analysis of interaction of spinal and supraspinal reflex pathways involved in physiological tremor
K. Sakamoto; T. Miao; M. Arihara
A model of feedback type in which physiological tremor are produced by both muscular skeletal system and reflex action is described. Analysis of this model shows that the interaction between the spinal and the supraspinal reflex pathways is important in responsible for low and high frequency oscillations of physiological tremor. Particularly the effect of gain ratio of the two pathways is studied in order to examine the role for the two reflex pathways in controlling neuromuscular oscillations. The existence of a critical point of the gain ratio at which one oscillating frequency transitions to two ones is predicted theoretically. A shift of the critical point with variations of weight load is found and suggests a changeable correlation relation between the spinal and the supraspinal pathways due to loading conditions. Our computations for physiological tremor demonstrate the results that the high frequency component of about 25 Hz is produced by the muscle-spinal reflex loop, and the low frequency component of about 10 Hz originates from the central nervous system or from supraspinal reflex loop. Several relations derived in this study are described, and they can be compared with experimental observations. Our model sheds considerable light on the details of the possible mechanism for physiological tremor. In addition, a possibility arising from our study is that the tremulous oscillation associated with some pathological states, say Parkinson's disease, may arise from modified gains in one or more of the reflex pathways., Mar. 1998, Electromyography and Clinical Neurophysiology, 38, 2, 103-113, English, 0301-150X, 9553748, 0031976225 - Analysis of interaction of spinal and supraspinal reflex pathways involved in physiological tremor
K. Sakamoto; T. Miao; M. Arihara
A model of feedback type in which physiological tremor are produced by both muscular skeletal system and reflex action is described. Analysis of this model shows that the interaction between the spinal and the supraspinal reflex pathways is important in responsible for low and high frequency oscillations of physiological tremor. Particularly the effect of gain ratio of the two pathways is studied in order to examine the role for the two reflex pathways in controlling neuromuscular oscillations. The existence of a critical point of the gain ratio at which one oscillating frequency transitions to two ones is predicted theoretically. A shift of the critical point with variations of weight load is found and suggests a changeable correlation relation between the spinal and the supraspinal pathways due to loading conditions. Our computations for physiological tremor demonstrate the results that the high frequency component of about 25 Hz is produced by the muscle-spinal reflex loop, and the low frequency component of about 10 Hz originates from the central nervous system or from supraspinal reflex loop. Several relations derived in this study are described, and they can be compared with experimental observations. Our model sheds considerable light on the details of the possible mechanism for physiological tremor. In addition, a possibility arising from our study is that the tremulous oscillation associated with some pathological states, say Parkinson's disease, may arise from modified gains in one or more of the reflex pathways., Mar. 1998, Electromyography and Clinical Neurophysiology, 38, 2, 103-113, English, 0301-150X, 9553748, 0031976225 - 生理的機能評価の発生メカニズムとその疲労評価への応用
1998, 人間工学会誌, 34, 248-249 - Study of Evoked Potentials Induced by Stimulus of Four Basic Tastes under Influence of Miracle Fruit
1998, Jap. J. Taste and SmellResearch, 5, 391-394 - New Apparatus Stimulating the Region of Tongue Innervated by Glossopharyngeal Nerve and Its Application to Monosodium Glutamate (MSG) Solution :
Min Byung Chan; Wada Masashi; Sakamoto Kazuyoshi
Some apparatuses stimulating the region of tongue innervated by chorda tympani nerve were well known and they were used popularly, but the apparatuses for glossopharyngeal nerve were not produced yet. In the study, the apparatus for the stimulations of glossopharyngeal nerve was trially produced. It was known that the substance of "Umami" was responded well in the tongue region innervated by glossopharyngeal nerve. The evoked potential for the stimulations of monosodium glutamate (MSG) solution which was known as substance of Umami was measured with the use of the trial stimulating apparatus. The evoked potential was detected by monopolar lead for the positions between Cz and A1 (left lobe) with the ground at Fpz. The evoked potential of MSG consisted of a positive peak wave with the latency at approximately 250 ms. The amplitudes increased and the latency decreased as the concentration of MSG increased. The evoked potential stimulating the tongue innervated by this glossopharyngeal nerve could be detected for the first time by the use of the trial apparatus., Japan Society of Physiological Anthropology, 1998, Applied human science : journal of physiological anthropology, 17, 2, 67-71, English, 1341-3473, 110002508224, AA11053183, 9611370 - Influence of sweet suppressing agent on gustatory brain evoked potentials generated by taste stimuli.
MIN B. C.
1998, Appl Human Sci, 17, 1, 9-17, 1341-3473, 30014093720, AA11053183, 9575639 - Study of Evoked Potentials Induced by Stimulus of Four Basic Tastes under Influence of Miracle Fruit
1998, Jap. J. Taste and SmellResearch, 5, 391-394 - New Apparatns Stimulating the Region of Tongue Innervated by Glossophalangeal Nerve and its Application to Monosodium Glutamate(MSG) Solution
Byung Chan Min; Masashi Wada; Kazuyoshi Sakamoto
Some apparatuses stimulating the region of tongue innervated by chorda tympani nerve were well known and they were used popularly, but the apparatuses for glossopharyngeal nerve were not produced yet. In the study, the apparatus for the stimulations of glossopharyngeal nerve was trially produced. It was known that the substance of "Umami" was responded well in the tongue region innervated by glossopharyngeal nerve. The evoked potential for the stimulations of monosodium glutamate (MSG) solution which was known as substance of Umami was measured with the use of the trial stimulating apparatus. The evoked potential was detected by monopolar lead for the positions between Cz and A1 (left lobe) with the ground at Fpz. The evoked potential of MSG consisted of a positive peak wave with the latency at approximately 250 ms. The amplitudes increased and the latency decreased as the concentration of MSG increased. The evoked potential stimulating the tongue innervated by this glossopharyngeal nerve could be detected for the first time by the use of the trial apparatus., Japan Society of Physiological Anthropology, 1998, Applied Human Science, 17, 2, 67-71, English, 1341-3473, 110002508224, AA11053183, 9611370 - Influence of Sweet Suppressing Agent on Gustatory Brain Evoked Potentials Generated by Taste Stimuli
Byung Chan Min; Kazuyoshi Sakamoto
1998, Applied Human Science, 17, 1, 9-17, 1341-3473, 30014093720, 9575639 - Analysis of the bus chaining phenomenon in traffic congestion
PG Wijayarathna; C Ito; K Sakamoto; S Hamba; T Kushiya
This paper describes the development of a microscopic simulation model purely from a traffic engineering point of view, to perform numerical analysis on the bus chaining phenomenon observed in traffic congestion, Bus chaining creates impatience among passengers, and is one of the greatest problems faced by a bus scheduler, The simulation study was performed to understand why bus chaining occurs, when it is likely to occur and whether it is possible to eliminate it. This model has been developed using a set of general purpose subroutines of the ATRAS (Automobile TRAffic Simulator) such as the Road Element, the Intersection Element and the Vehicle Generating Point. Although the simulation model is microscopic, the validation and verification procedures employed in this research are macroscopic, In the simulation process, since random numbers play a significant role, tests for randomness are inevitable. Surrounding traffic volume and the number of waiting passengers at bus stops are the key variables considered in the analysis, Simulation results show that the amount of bus chaining increases with the increase in the number of waiting passengers, even at a comparatively low volume of traffic, However, if the number of waiting passengers is increased, a high volume of traffic does not increase the bus chaining. (C) 1997 by John Wiley & Sons, Ltd., JOHN WILEY & SONS LTD, Sep. 1997, SOFTWARE-PRACTICE & EXPERIENCE, 27, 9, 1067-1081, English, 0038-0644, 80009852492, WOS:A1997XW08300005 - An investigation of stretch reflex in physiological tremor
T. Miao; K. Sakamoto
This paper describes a theoretical consideration on muscle stretch reflex in physiological tremor (abbreviated as tremor). In making a model, the function of rostro-caudal homonymous motoneurone pool as well as the interaction between spinal cord mechanism and supraspinal system is investigated. The known physiology of the neuromuscular oscillations is used to evaluate the responses of a set of differential equation that represents lumped system dynamics underlying the stretch reflex process of tremor. According to the model, the stretch reflex along with the mechanics of limb is behaving as a filter. With sharp resonant peaks and without the need of any external inputs, the filter selects oscillators and sustains tremulous movement. These reflex features, especially the findings of an existence of two sharp resonant centers, are particular valuable in an explanation of the two spectral peaks observed in tremor. It is demonstrated that (1) the two peaks of tremor, which vibrate at 10 Hz and 20 Hz, largely depend on the coupling λ between spinal and supraspinal system, i.e., λ leads to 'spontaneous symmetry breaking' producing a peak doubling
(2) the two peaks are attributable to two decoupled states found in our model. The pea with 10 Hz is attributed to the state Z+ (t) describing an average state of spinal + supraspinal system, while the one with 20 Hz denotes the state Z' (t) which presents a relative movement of spinal and supraspinal system. With regarding to the nature of tremor under various conditions such as loading, fatigue, and pseudo-gravity, this paper discusses the possible connections of λ to these experimental environments. Also, this paper argues that representation of stretch reflex by the decoupled states is more essential than other traditional representations used in approaching to tremor phenomena., Sep. 1997, Electromyography and Clinical Neurophysiology, 37, 6, 343-357, English, 0301-150X, 9313996, 0030826366 - Analysis of the bus chaining phenomenon in traffic congestion
PG Wijayarathna; C Ito; K Sakamoto; S Hamba; T Kushiya
This paper describes the development of a microscopic simulation model purely from a traffic engineering point of view, to perform numerical analysis on the bus chaining phenomenon observed in traffic congestion, Bus chaining creates impatience among passengers, and is one of the greatest problems faced by a bus scheduler, The simulation study was performed to understand why bus chaining occurs, when it is likely to occur and whether it is possible to eliminate it. This model has been developed using a set of general purpose subroutines of the ATRAS (Automobile TRAffic Simulator) such as the Road Element, the Intersection Element and the Vehicle Generating Point. Although the simulation model is microscopic, the validation and verification procedures employed in this research are macroscopic, In the simulation process, since random numbers play a significant role, tests for randomness are inevitable. Surrounding traffic volume and the number of waiting passengers at bus stops are the key variables considered in the analysis, Simulation results show that the amount of bus chaining increases with the increase in the number of waiting passengers, even at a comparatively low volume of traffic, However, if the number of waiting passengers is increased, a high volume of traffic does not increase the bus chaining. (C) 1997 by John Wiley & Sons, Ltd., JOHN WILEY & SONS LTD, Sep. 1997, SOFTWARE-PRACTICE & EXPERIENCE, 27, 9, 1067-1081, English, 0038-0644, 80009852492, WOS:A1997XW08300005 - An investigation of stretch reflex in physiological tremor
T. Miao; K. Sakamoto
This paper describes a theoretical consideration on muscle stretch reflex in physiological tremor (abbreviated as tremor). In making a model, the function of rostro-caudal homonymous motoneurone pool as well as the interaction between spinal cord mechanism and supraspinal system is investigated. The known physiology of the neuromuscular oscillations is used to evaluate the responses of a set of differential equation that represents lumped system dynamics underlying the stretch reflex process of tremor. According to the model, the stretch reflex along with the mechanics of limb is behaving as a filter. With sharp resonant peaks and without the need of any external inputs, the filter selects oscillators and sustains tremulous movement. These reflex features, especially the findings of an existence of two sharp resonant centers, are particular valuable in an explanation of the two spectral peaks observed in tremor. It is demonstrated that (1) the two peaks of tremor, which vibrate at 10 Hz and 20 Hz, largely depend on the coupling λ between spinal and supraspinal system, i.e., λ leads to 'spontaneous symmetry breaking' producing a peak doubling
(2) the two peaks are attributable to two decoupled states found in our model. The pea with 10 Hz is attributed to the state Z+ (t) describing an average state of spinal + supraspinal system, while the one with 20 Hz denotes the state Z' (t) which presents a relative movement of spinal and supraspinal system. With regarding to the nature of tremor under various conditions such as loading, fatigue, and pseudo-gravity, this paper discusses the possible connections of λ to these experimental environments. Also, this paper argues that representation of stretch reflex by the decoupled states is more essential than other traditional representations used in approaching to tremor phenomena., Sep. 1997, Electromyography and Clinical Neurophysiology, 37, 6, 343-357, English, 0301-150X, 9313996, 0030826366 - Effect of Muscle Length on Distribution of Muscle Fiber Conduction Velocity for M. Biceps Brachii :
Sakamoto Kazuyoshi; Li Weiqiang
The influence of the muscle length on the distribution of muscle fiber conduction velocity (MFCV) was estimated at 3 different elbow angles (90゜, 120゜and 150゜) during the contraction of 30% of isometric maximum voluntary contraction (MVC). Surface electromyogram was recorded in the distal region of m. biceps brachii using a surface array electrode. MFCV_S at the different locations from the end-plate to the distal tendon of the muscle were measured directly using the averaging method. MFCV_S near the end-plate and the distal tendon of the muscle showed the high values, while MFCV_S in the middle region between the end-plate and the distal tendon of the muscle had low values at the same elbow angles. The mean MFCV_S in the middle region decreased when the muscle length increased during the contraction of 30% MVC. The middle region length changed when the elbow joint was extended from the elbow angle of 90゜ to that of 150゜. Although previous studies showed the influence of muscle length on MFCV for special regions (like end-plate, tendon, and middle region), MFCV for whole regions, that is, the distribution of MFCV has not been studied for various muscle length. The MFCV for the some region in the some muscle length could not be estimated. In the study, the distribution of MFCV in various muscle length for the contraction of 30% MVC was obtained, and the model with the function including muscle length for the estimation of MFCV was presented., Japan Society of Physiological Anthropology, 1997, Applied human science : journal of physiological anthropology, 16, 1, 1-7, English, 1341-3473, 110002508667, AA11053183, 9088091 - 個人閾値を考慮した四基本味の相対濃度に対する誘発脳波
1997, 日本味と匂学会誌, 4, 1, 43-54 - Effect of Muscle Length on Distribution of Muscle Fiber Conduction Velocity for M. Biceps Brachii
Kazuyoshi Sakamoto; Weiqiang Li
The influence of the muscle length on the distribution of muscle fiber conduction velocity (MFCV) was estimated at 3 different elbow angles (90゜, 120゜and 150゜) during the contraction of 30% of isometric maximum voluntary contraction (MVC). Surface electromyogram was recorded in the distal region of m. biceps brachii using a surface array electrode. MFCV_S at the different locations from the end-plate to the distal tendon of the muscle were measured directly using the averaging method. MFCV_S near the end-plate and the distal tendon of the muscle showed the high values, while MFCV_S in the middle region between the end-plate and the distal tendon of the muscle had low values at the same elbow angles. The mean MFCV_S in the middle region decreased when the muscle length increased during the contraction of 30% MVC. The middle region length changed when the elbow joint was extended from the elbow angle of 90゜ to that of 150゜. Although previous studies showed the influence of muscle length on MFCV for special regions (like end-plate, tendon, and middle region), MFCV for whole regions, that is, the distribution of MFCV has not been studied for various muscle length. The MFCV for the some region in the some muscle length could not be estimated. In the study, the distribution of MFCV in various muscle length for the contraction of 30% MVC was obtained, and the model with the function including muscle length for the estimation of MFCV was presented., Japan Society of Physiological Anthropology, 1997, Applied Human Science, 16, 1, 1-7, English, 1341-3473, 110002508667, AA11053183, 9088091 - An Analysis of Gustatory Evoked Potentials for the Four Taste Qualities with a Special Reference to Individual Taste Thresholds
1997, Japanese Journal of smell and order, 4, 1, 43-54 - Discrimination of Forearm's Motions by Surface EMG Signals using Neural Network
ITAKURA Naoaki; KINBARA Yoh; FUWA Teruhiko; SAKAMOTO Kazuyoshi
We tried to discriminate different forearm's motions by surface EMG signals using neural network. In order to get a higher discrimination rate, the positions of electrodes were improved. We also tried to discriminate similar motions in order to clarify the limitation of the discrimination by surface EMG signals. Two experiments were carried out. One was to discriminate five different motions: grasp, wrist flexion, wrist extension, forearm pronation, and forearm supination (Experiment 1). The other was to discriminate four similar motions which have different quantitative definitions at grasp, wrist flexion/extension, or forearm pronatio/supination (Experiment 2). Four surface electrodes were placed on the skin above the main active muscles: short radial extensor m. of wrist, supinator m., long radial extensor m. of wrist, and ulnar flexor m. of wrist, considering anatomical functions of the forearm's muscles. EMG signals were recorded during 2 sec while the subjects kept the motions. Recorded EMG signals were sampled at 200 msec intervals after full-wave rectifying and low-pass filtering. Therefore, the number of sampling data patterns of EMG signals was 10 for every motion. Three layers of neural network was used for discrimination. The number of units in the input layer is 4, and the number of units in the output layer is 5 or 4. In order to get the best discrimination rate of the motions, we changed the number of units in the hidden layer from 3 to 12. The neural network was trained by the back-propagation algorithm. In Experiment 1, the best average values of discrimination rates under three pattems of EMG signals for each subject were 96.0%, 98.0%, and 87.2% when the numbers of units in the hidden layer were 10, 11, and 3 respectively. In Experiment 2 using original EMG patterns, the best average values of discrimination rates at grasp, extension/flexion, and pronation/supination were 59.5%, 76.0%, and 25.0% respectively. By using normalized EMG patterns, these were 40.0%, 84.8%, and 55.5% respectively., Japan Society of Physiological Anthropology, 1996, Journal of PHYSIOLOGICAL ANTHROPOLOGY and Applied Human Science, 15, 6, 287-294, English, 1341-3473, 10002424813, AA11053183, 9008983 - Distribution of muscle fiber conduction velocity of m. biceps brachii during voluntary isometric contraction with use of surface array electrodes.
LI W.
1996, Appl Human Sci, 15, 1, 41-53, 1341-3473, 30014093670, AA11053183, 8729475 - The influence of location of electrode on muscle fiber conduction velocity and EMG power spectrum during voluntary isometric contraction measured with surface array electrodes.
LI W.
1996, Appl Human Sci, 15, 1, 25-32, 1341-3473, 30014093668, AA11053183, 8729473 - 固視微動(フリック)によるVDT作業の視覚疲労評価に関する研究
顧 力剛; 坂本 和義
1996, 日本人間工学会誌, 32, 2, 87-97, 0549-4974, 20000341481, AN00199371 - Discrimination of Forearm's Motions by Surface EMG Signals Using Neural Network
Naoaki Itakura; Yoh Kinbara; Teruhiko Fuwa; Kazuyoshi Sakamoto
We tried to discriminate different forearm's motions by surface EMG signals using neural network. In order to get a higher discrimination rate, the positions of electrodes were improved. We also tried to discriminate similar motions in order to clarify the limitation of the discrimination by surface EMG signals. Two experiments were carried out. One was to discriminate five different motions: grasp, wrist flexion, wrist extension, forearm pronation, and forearm supination (Experiment 1). The other was to discriminate four similar motions which have different quantitative definitions at grasp, wrist flexion/extension, or forearm pronatio/supination (Experiment 2). Four surface electrodes were placed on the skin above the main active muscles: short radial extensor m. of wrist, supinator m., long radial extensor m. of wrist, and ulnar flexor m. of wrist, considering anatomical functions of the forearm's muscles. EMG signals were recorded during 2 sec while the subjects kept the motions. Recorded EMG signals were sampled at 200 msec intervals after full-wave rectifying and low-pass filtering. Therefore, the number of sampling data patterns of EMG signals was 10 for every motion. Three layers of neural network was used for discrimination. The number of units in the input layer is 4, and the number of units in the output layer is 5 or 4. In order to get the best discrimination rate of the motions, we changed the number of units in the hidden layer from 3 to 12. The neural network was trained by the back-propagation algorithm. In Experiment 1, the best average values of discrimination rates under three pattems of EMG signals for each subject were 96.0%, 98.0%, and 87.2% when the numbers of units in the hidden layer were 10, 11, and 3 respectively. In Experiment 2 using original EMG patterns, the best average values of discrimination rates at grasp, extension/flexion, and pronation/supination were 59.5%, 76.0%, and 25.0% respectively. By using normalized EMG patterns, these were 40.0%, 84.8%, and 55.5% respectively., Japan Society of Physiological Anthropology, 1996, Applied Human Science, 15, 6, 287-294, English, 1341-3473, 10002424813, AA11053183, 9008983 - Distribution of Muscle Fiber Conduction Velocity of M. Biceydr Brachii during Voluntary Isometice Contraction with Use of Surface Array Electrodes
1996, Applied Human Science, 15, 1, 41-53, 1341-3473, 30014093670, 8729475 - The Influence of Location of Electrode on Muscle Fiber Conduction Velocity and EMG Power Spectrum during Voluntary Isometric Cotraction Measured with Surface Array Electrodes
1996, Applied Human Science, 15, 1, 25-32, 1341-3473, 30014093668, 8729473 - Monitoring Accumulative Fatigue of Finger by Autoregressive Modeling of Physiological Tremor :
Miao Tiejun; Sakamoto Kazuyoshi
Japan Society of Physiological Anthropology, 1995, Applied human science : journal of physiological anthropology, 14, 1, 29-36, English, 1341-3473, 110002508511, AA11053183, 7621131 - STUDY OF FUNCTION OF FINGERS BY PHYSIOLOGICAL TREMOR
K SAKAMOTO; N ITAKURA; K NISHIDA; L ZHOU
1. Physiological tremor is invisible mechanical vibration of body parts. 2. It has two peak frequencies in the power spectrum. The origin of the peaks has not been well elucidated. Therefore, the mechanism and its application to labor science is studied in the paper. 3. The effect of immersion of fingers in water and of loading weights on; fingers are performed to elucidate the mechanism involved. 4. It is found that the power spectrum output has two bands from the lower frequency band (1.5-18 Hz) from the CNS and the higher frequency band (18-50 Hz). 5. These results are applied to the evaluation of fatigue of fingers in tapping and typing work. 6. The total power, which is the sum of power spectrum in frequency range between 1.5 and 50 Hz, is employed as evaluational index. The change of total power explains finger fatigue during tapping and typing loads. 7. Physiological tremor is an effective way of evaluating the function of fingers in human work., PERGAMON-ELSEVIER SCIENCE LTD, Dec. 1993, JOURNAL OF THERMAL BIOLOGY, 18, 5-6, 665-669, English, 0306-4565, WOS:A1993MT80700065 - STUDY OF FUNCTION OF FINGERS BY PHYSIOLOGICAL TREMOR
K SAKAMOTO; N ITAKURA; K NISHIDA; L ZHOU
1. Physiological tremor is invisible mechanical vibration of body parts. 2. It has two peak frequencies in the power spectrum. The origin of the peaks has not been well elucidated. Therefore, the mechanism and its application to labor science is studied in the paper. 3. The effect of immersion of fingers in water and of loading weights on; fingers are performed to elucidate the mechanism involved. 4. It is found that the power spectrum output has two bands from the lower frequency band (1.5-18 Hz) from the CNS and the higher frequency band (18-50 Hz). 5. These results are applied to the evaluation of fatigue of fingers in tapping and typing work. 6. The total power, which is the sum of power spectrum in frequency range between 1.5 and 50 Hz, is employed as evaluational index. The change of total power explains finger fatigue during tapping and typing loads. 7. Physiological tremor is an effective way of evaluating the function of fingers in human work., PERGAMON-ELSEVIER SCIENCE LTD, Dec. 1993, JOURNAL OF THERMAL BIOLOGY, 18, 5-6, 665-669, English, 0306-4565, WOS:A1993MT80700065 - 五指の生理的振戦の特徴とタイプ作業における指の機能評価
1993, The Annals of Physiological Anthropology, 11, 61-69 - Characteristics of physiological tremor in Five finger and evaluation of fingers in typing
SAKAMOTO Kazuyoshi; NISHIDA Kohji; ZHOU Li; ITAKURA Naoaki; SEKI Kunihiro; HAMBA Satoshi
生理人類学研究会, 1993, The Annals of Physiological Anthropology, 11, 1, 61-68, English, 0287-8429, 110002507674, AN10219533, 1567521 - On the Visual Recognition of Moving Letter :
SAKAMOTO Kazuyoshi; ITAKURA Naoaki; IMAMURA Koichi; KINEBUCHI Naoyuki; SEKI Kunihiro; HANBA Satoshi
The visual recognition (i.e., Iegibility) of moving object was studied. The numerical letters were mainly used as the objects. The influences of (1) directlon of the movement, (2) thickness of line of letter (i.e., stroke width) ,and (3) design of letter to the visual recognition were measured. From these measurements, the optimal numerical letters were proposed in the first step of the study, which were called as llvIAL(initial most optimal arabic letters). The visual recognition of both moving letters IMAL and letters JIS ( Japan industrial standard) employed for motionless state was compared for both the moving and the motionless states. In the presentation for motionless state, Ietters JIS showed iower error rate, but the statistical significance was not proved, while in the presentation for horizontally moving state letters IMAL showed better visual recognition than letters JIS with the significant level of 5 %. Therefore, the useful numerical letters for moving state could be designed in the study. Moreover, the visual recognition of letters IMAL was evaluated for various moving velocities. The optimal moving velocities for both letters IMAL and JIS were found., Japan Society of Physiological Anthropology, 1992, The Annals of physiological anthropology, 11, 6, 611-624, English, 0287-8429, 110002507504, AN10219533 - On the Visual Recognition of Moving Letter
SAKAMOTO Kazuyoshi; ITAKURA Naoaki; IMAMURA Koichi; KINEBUCHI Naoyuki; SEKI Kunihiro; HANBA Satoshi
The visual recognition (i.e., Iegibility) of moving object was studied. The numerical letters were mainly used as the objects. The influences of (1) directlon of the movement, (2) thickness of line of letter (i.e., stroke width) ,and (3) design of letter to the visual recognition were measured. From these measurements, the optimal numerical letters were proposed in the first step of the study, which were called as llvIAL(initial most optimal arabic letters). The visual recognition of both moving letters IMAL and letters JIS ( Japan industrial standard) employed for motionless state was compared for both the moving and the motionless states. In the presentation for motionless state, Ietters JIS showed iower error rate, but the statistical significance was not proved, while in the presentation for horizontally moving state letters IMAL showed better visual recognition than letters JIS with the significant level of 5 %. Therefore, the useful numerical letters for moving state could be designed in the study. Moreover, the visual recognition of letters IMAL was evaluated for various moving velocities. The optimal moving velocities for both letters IMAL and JIS were found., Japan Society of Physiological Anthropology, 1992, The Annals of Physiological Anthropology, 11, 6, 611-624, English, 0287-8429, 110002507504, AN10219533 - Analysis of Coordinated Mechanism of the Neuro-muscular Function and Its Application to Physical Therapy
UCHIYAMA Yasushi; NAGASAWA Hiroshi; SAKAMOTO Kazuyoshi; NAGATA Akira
The purpose of this study was to analyze the coordinated mechanism in patients, as a measure of the evaluation systems for coordination of neuro-muscular functions and then it would apply to the evaluation for the treatment about coordinated function. In this study, subjects were 35 coordinated dysfunction patients and 30 healthy adults (control), Coordinated function for the patients (standard neurological examination, equilibrium function, and activity of daily living) were measured. Subjects sat on chairs and laid forearm on an elbow rest. Physiological (pathological) tremor at the index finger was measured by a miniature accelerator. These data for each one minute were calculated by Fourier transform and evaluated with peak frequency of power spectrum and integrated amplitude of band in the range from 3 to 100 Hz. The evaluations of the peak frequency and amplitude and coordinated functions were all studied by statistical analysis in order to find corelations among data. In the results, the peak frequency for the patients was lower than that of the control and the amplitude for patients was higher than that for the control. Differences in peak frequency and amplitude between cerebellar-ponte lesions of patients and controls were significant at a level of 1%. Therefore, the influence of the neuro-muscular functions would seem to be related to the mechanism of pathological tremor, so that the theory of spinal reflex by Lippold could not elucidate the mechanism of pathological tremor. More data about mechanism of the coordination and considering functional disorder are much important to give some evaluation and treatment in patient with coordinated dysfunction., Japanese Physical Therapy Association (JPTA), 1989, The Journal of Japanese Physical Therapy Association, 16, 5, 331-338, Japanese, 0289-3770, 110003995094, AN10146032 - Evaluation of muscular load of m. biceps brachii in isometric contraction with the use of microvibration
K. Sakamoto; T. Usui
1988, Annals of Physiological Anthropology, 7, 1, 23-29, English, 0287-8429, 110002507492, 3267243, 0023872942 - Evaluation of muscular load of m. biceps brachii in isometric contraction with the use of microvibration
K. Sakamoto; T. Usui
1988, Annals of Physiological Anthropology, 7, 1, 23-29, English, 0287-8429, 110002507492, 3267243, 0023872942 - 内部障害者の職業補導における心的側面
1985, 労働科学 (労働科学研究所出版), 61, 419-446 - MICROVIBRATION IN MYOGENIC DYSTROPHY PATIENTS
SAKUMA Haruo; NAGATA Akira; SAKAMOTO Kazuyoshi; USUI Toshitomo; MURO Masuo; MURAKAMI Keiro
The purpose of this study was to elucidate the muscular influence of microvibration (MV) and to apply MV to the evaluation of a medical index for dystrophy patients. Subjects were 10 myotonic dystrophy patients (MD; 7 males and 3 females, 43.5±8.2 years), five limb-girdle patients in progressive muscular dystrophy (LG; 4 males and 1 female, 38.6±12.7 years), and 12 normal subjects (males, 21.0±2.0 years) being treated for comparison. Muscular function data for the patients (function stage, grip strength, and pinching force) were measured before the experiment. Metric data (length and girth of upper limb) were also measured. Subjects sat on chairs and laid their right forearm on an elbow rest. MV's at eyelid, m. biceps brachii, and right thenar were detected by MT-3 T. Physiological tremor at the palm was measured by a miniature accelerator. The order used in the experiment was resting state for two minutes, maximum voluntary contraction (MVC), the holding of 60% MVC for one minute, and resting state for three minutes. The MV and physiological tremor data for each one minute were analyzed by (a) integrated amplitude of five bands in the range from 2 to 30Hz, and (b) the first peak frequency of power spectrum. The evaluations of the amplitude and peak frequency and the data of the muscular functions and metrics were all studied by principal component analysis in order to find correlations among the data. MV for eyelid, m. biceps brachii, and thenar showed the characteristic main bands, i. e., delta band (2-4Hz), alpha band (8-13Hz), and theta band (4-8Hz), respectively. MV amplitude for the patients was lower than that, for normal subjects. MV amplitude for the normal subjects increased during 60% MVC, but this phenomenon was not recognized in the patients. Similar results were shown in the first peak frequency: The peak frequency for the patients waslower by 2 Hz than that for the normal controls and was hardly influenced by conditions like rest or load. Differences in peak frequency and amplitude between MD patients and normal controls were at a level of 1% significance. The results of principal component analysis denoted that the function stage closely correlated to the peak frequency of MV at thenar and m. biceps brachii and to the metrics of the upper limb. The above results showed that MV was affected by muscles. Therefore, the influence of the neuromuscular system (i. e., gamma motor system) would seem to be related to the mechanism of MV. Moreover, as the medical index of MV, peak frequency and amplitude for MD and LG were lower than that for the normal subjects. This tendency was emphasized by imposing increased load., Society of Biomechanisms, 1984, Biomechanisms, 7, 21-31, Japanese, 110004695392 - 長時間拘束直立姿勢保持における下肢筋の機能評価
臼居 利朋; 坂本 和義; 永田 晟; 室 増男
静的持続筋収縮による筋機能低下の評価指標を求めるために, 成人男子10名を用いて45分間の直立姿勢保持を行った. 直立中は自覚症状と下肢筋群 (大腿直筋, 大腿二頭筋, 前脛骨筋, ヒラメ筋) の表面筋電図を調べ, 直立前後においては脛骨神経の電気刺激による腓腹筋の誘発筋電図 (M波, H波) と, 足底の底屈による張力を測定した. 直立中は筋電図の徐波化は認められなかったが, (a) ヒラメ筋の積分筋電図において顕著な増大が認められ, 自覚症状の訴え頻度と呼応していた, 直立後は (b) 最大上刺激電圧における張力 (T) とM波の振幅 (M) との比T/Mが減少し, 筋機能の変化を示し, また (c) H波の最大値 (H) とM波の最大上刺激電圧における値との比H/Mも減少し, 脊髄レベルまで含めた神経・筋の変化を示していた. 比 (T/MやH/M) と自覚症状の訴えや積分筋電図との対応が必ずしも認められなかったことから, 45分間の直立姿勢保持では自覚症状の訴えや積分筋電図の増大は直立姿勢保持により発生したものであるが, 筋電図が徐波化していないため筋機能低下までは表現していない. したがって, 電気刺激により筋機能を100%発揮させて得られた指標T/MとH/Mが, 筋機能低下を示す有効な指標と結論づけられた., Japan Ergonomics Society, 1984, 日本人間工学会誌, 20, 4, 213-223, Japanese, 0549-4974, 40003081415 - Microvibration in myogenic dystrophy patients
SAKUMA Haruo; NAGATA Akira; SAKAMOTO Kazuyoshi; USUI Toshitomo; MURO Masuo; MURAKAMI Keiro
The purpose of this study was to elucidate the muscular influence of microvibration (MV) and to apply MV to the evaluation of a medical index for dystrophy patients. Subjects were 10 myotonic dystrophy patients (MD; 7 males and 3 females, 43.5±8.2 years), five limb-girdle patients in progressive muscular dystrophy (LG; 4 males and 1 female, 38.6±12.7 years), and 12 normal subjects (males, 21.0±2.0 years) being treated for comparison. Muscular function data for the patients (function stage, grip strength, and pinching force) were measured before the experiment. Metric data (length and girth of upper limb) were also measured. Subjects sat on chairs and laid their right forearm on an elbow rest. MV's at eyelid, m. biceps brachii, and right thenar were detected by MT-3 T. Physiological tremor at the palm was measured by a miniature accelerator. The order used in the experiment was resting state for two minutes, maximum voluntary contraction (MVC), the holding of 60% MVC for one minute, and resting state for three minutes. The MV and physiological tremor data for each one minute were analyzed by (a) integrated amplitude of five bands in the range from 2 to 30Hz, and (b) the first peak frequency of power spectrum. The evaluations of the amplitude and peak frequency and the data of the muscular functions and metrics were all studied by principal component analysis in order to find correlations among the data. MV for eyelid, m. biceps brachii, and thenar showed the characteristic main bands, i. e., delta band (2-4Hz), alpha band (8-13Hz), and theta band (4-8Hz), respectively. MV amplitude for the patients was lower than that, for normal subjects. MV amplitude for the normal subjects increased during 60% MVC, but this phenomenon was not recognized in the patients. Similar results were shown in the first peak frequency: The peak frequency for the patients waslower by 2 Hz than that for the normal controls and was hardly influenced by conditions like rest or load. Differences in peak frequency and amplitude between MD patients and normal controls were at a level of 1% significance. The results of principal component analysis denoted that the function stage closely correlated to the peak frequency of MV at thenar and m. biceps brachii and to the metrics of the upper limb. The above results showed that MV was affected by muscles. Therefore, the influence of the neuromuscular system (i. e., gamma motor system) would seem to be related to the mechanism of MV. Moreover, as the medical index of MV, peak frequency and amplitude for MD and LG were lower than that for the normal subjects. This tendency was emphasized by imposing increased load., Society of Biomechanisms, 1984, Biomechanisms, 7, 21-31, Japanese, 110004695392 - Evaluation of muscular function of lower limb in prolonged and sustained standing posture
1984, 20, 213-223 - NOTE ON CALCULATIONS BY HYPERVIRIAL RELATIONS AND SUFFICIENT CONDITIONS FOR THESE RELATIONS - BOX POTENTIAL AND HARMONIC-OSCILLATOR MODELS
T TERASAKA; K SAKAMOTO
JOHN WILEY & SONS INC, 1982, INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, 21, 3, 543-556, English, 0020-7608, 80001185142, WOS:A1982ND65800002 - The wave analyses with the fast Fourier transform on surface electromyogram and tremor during an acute and an accumulative fatigue
K. Sakamoto; T. Usui; A. Hayami; K. Ohkoshi
The optimal analyses in the fast discrete Fourier transform were scrutinized by the signal processor. The optimal sampling time (1 msec.) and duration time (greater than thirty seconds) were obtained for the study of the surface electromyogram (EMG). Two kinds of fatigue (i.e., an acute fatigue by sustaining a heavy weight and an accumulative fatigue by a typewriting work) were studied in m. biceps brachii. In order to detect thus fatigues, three kinds of the evaluations of EMG's power spectra were investigated
that is, [1] the change of the main frequency, [2] the statistic (mean and standard deviation), and [3] the power spectra difference between two states (e.g., states before and after work) were examined. All the procedures were effective in detecting the acute fatigue, while only the third procedure ([3]) was effective for the accumulative fatigue. In the all-out stage, the close relationship between EMG and the tremor at m. biceps brachii was demonstrated by the time series evaluation of the cross-correlation function., 1982, Electromyography and Clinical Neurophysiology, 22, 3, 207-228, English, 0301-150X, 7075527, 0020034694 - NOTE ON CALCULATIONS BY HYPERVIRIAL RELATIONS AND SUFFICIENT CONDITIONS FOR THESE RELATIONS - BOX POTENTIAL AND HARMONIC-OSCILLATOR MODELS
T TERASAKA; K SAKAMOTO
JOHN WILEY & SONS INC, 1982, INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, 21, 3, 543-556, English, 0020-7608, 80001185142, WOS:A1982ND65800002 - The wave analyses with the fast Fourier transform on surface electromyogram and tremor during an acute and an accumulative fatigue
K. Sakamoto; T. Usui; A. Hayami; K. Ohkoshi
The optimal analyses in the fast discrete Fourier transform were scrutinized by the signal processor. The optimal sampling time (1 msec.) and duration time (greater than thirty seconds) were obtained for the study of the surface electromyogram (EMG). Two kinds of fatigue (i.e., an acute fatigue by sustaining a heavy weight and an accumulative fatigue by a typewriting work) were studied in m. biceps brachii. In order to detect thus fatigues, three kinds of the evaluations of EMG's power spectra were investigated
that is, [1] the change of the main frequency, [2] the statistic (mean and standard deviation), and [3] the power spectra difference between two states (e.g., states before and after work) were examined. All the procedures were effective in detecting the acute fatigue, while only the third procedure ([3]) was effective for the accumulative fatigue. In the all-out stage, the close relationship between EMG and the tremor at m. biceps brachii was demonstrated by the time series evaluation of the cross-correlation function., 1982, Electromyography and Clinical Neurophysiology, 22, 3, 207-228, English, 0301-150X, 7075527, 0020034694 - Principal component analysis of spontaneous physical movements in sustained standing posture of children
J. Kataoka; K. Sakamoto; T. Hara; A. Hayami
The spontaneous movements and heart rate of subjects aged 3 to 11 years (19 boys and 11 girls) were observed while they sustained the standing-at-ease position for 10 min. The factors influencing the occurrence of spontaneous movements are discussed. Gross bodily movements (movements of the whole upper and lower extremities and the trunk) and small movements such as those of the hands, feet or neck, were less frequent among older children than among younger ones. Some of the latter showed relatively high mean heart rate levels during standing, but the frequency of spontaneous movements proved to be not always relevant to heart rate levels. A principal component analysis suggested that the occurrence of these spontaneous movements would involve complex underlying factors, in part dependent on age and body size (the growth factor) and blinking, facial expression and gross or small movements being mutually interrelated to some extent. This relevance of the growth factor should be considered in studying free movements., 1981, Journal of Human Ergology, 10, 1, 61-71, English, 0300-8134, 7347763, 0019759817 - Principal component analysis of spontaneous physical movements in sustained standing posture of children
J. Kataoka; K. Sakamoto; T. Hara; A. Hayami
The spontaneous movements and heart rate of subjects aged 3 to 11 years (19 boys and 11 girls) were observed while they sustained the standing-at-ease position for 10 min. The factors influencing the occurrence of spontaneous movements are discussed. Gross bodily movements (movements of the whole upper and lower extremities and the trunk) and small movements such as those of the hands, feet or neck, were less frequent among older children than among younger ones. Some of the latter showed relatively high mean heart rate levels during standing, but the frequency of spontaneous movements proved to be not always relevant to heart rate levels. A principal component analysis suggested that the occurrence of these spontaneous movements would involve complex underlying factors, in part dependent on age and body size (the growth factor) and blinking, facial expression and gross or small movements being mutually interrelated to some extent. This relevance of the growth factor should be considered in studying free movements., 1981, Journal of Human Ergology, 10, 1, 61-71, English, 0300-8134, 7347763, 0019759817 - Effective utilization of off-diagonal Hypervirial relations considering diagonal Hypervirial relation: Harmonic oscillator case
1979, International Journal of Quantum Chemistry, 16, 6, 1357-1368, 0020-7608, 80000482039 - Effective utilization of off-diagonal Hypervirial relations considering diagonal Hypervirial relation: Harmonic oscillator case
1979, International Journal of Quantum Chemistry, 16, 6, 1357-1368, 0020-7608, 80000482039 - Core integral of 2pπ-electron evaluated from Heisenberg's equation of motion
1973, International Journal of Quantum Chemistry, 7, 337-345 - Core integral of 2pπ-electron evaluated from Heisenberg's equation of motion
1973, International Journal of Quantum Chemistry, 7, 337-345 - Electronic structures of the oxocarbon anions. Ⅲ. Application of the extended Hueckel and variable electronegativity extended Hueckel methods
1971, Bulletin of the Chemical Society of Japan, 44, 1201-1205 - Electronic structures of the oxocarbon anions. Ⅲ. Application of the extended Hueckel and variable electronegativity extended Hueckel methods
1971, Bulletin of the Chemical Society of Japan, 44, 1201-1205 - Electronic structures of the oxocarbons anions
1970, Journal of the American Chemical Society, 92, 2636-2639 - Electronic structures of the oxocarbons anions
1970, Journal of the American Chemical Society, 92, 2636-2639 - The role of the doubly excited configurations in the π-electronic structure of the croconate anion
1969, Theoretica chimica Acta, 13, 220-239 - The role of the doubly excited configurations in the π-electronic structure of the croconate anion
1969, Theoretica chimica Acta, 13, 220-239
Books and other publications
- 日本人の振動感覚（日本人の事典）
朝倉書店, Jun. 2003 - vibration sensation of Japaneses (Physiological and anthroplogical dictionary of Japaneses)
asakura shotenn, Jun. 2003 - 環境生理学
培風館, Apr. 2000 - Evaluation of Visual Function in VDT Work by the Application of Involuntery Eye Movement
Recent Advances in Physiological Anthronology, Kyushu University Press, 1999 - Evaluation of Visual Function in VDT Work by the Application of Involuntery Eye Movement
Recent Advances in Physiological Anthronology, Kyushu University Press, 1999 - 使いやすい操作具
現代のエスプリ(至文堂), 1996 - 健康と運動の生理
至文堂, 1994 - 電磁気学（誘電体）
近代科学社, 1993 - 障害者とアメニティ
現代のエスプリ(至文堂), 1993 - Electromagnetism(dielectrics)
kindai kagakusha, 1993 - The disordered person and the amenity
1993 - 心理現象を応用したVDT作業の視覚機能評価
労働災害防止協会出版, 1992 - 人間の許容限界ハンドブック
朝倉書店, 1990 - Handbook of Human limited Function
asakura shotenn, 1990 - 障害者とマンマシン-インターフェイス （マンマシン・インターフェイス）
朝倉書店, 1989 - Man-Machine Interface
asakura shotenn, 1989 - 高圧生理学
朝倉書店, Mar. 1988 - High Pressure Physiology
asakura publishing Co., Mar. 1988 - マン・コンピューター・インターフェイス （現代生活における生理人類学）
垣内出版, 1987 - 筋強直性ジストロフィー症患者のマイクロバイブレーション （運動遅滞者の運動機構と運動処方：永田晟 編集）
同文書院, 1987 - ＯＡ、ＣＡＩ
'87 先端科学技術開発年鑑, 1986 - Electromyograhic Features of Lower Limb Muscles for Neurogenic and Myogenic Patients During Standing Posture and Locomotion
Biomechanics IX-A, 1985 - Electromyograhic Features of Lower Limb Muscles for Neurogenic and Myogenic Patients During Standing Posture and Locomotion
Biomechanics IX-A, 1985 - からだ運動の科学
朝倉書店, 1983 - Science of Human Body and Sports
1983