A Comparative Study of Muscle Fatigue during Electrically-induced and Voluntary Contractions.

电诱导收缩和自主收缩期间肌肉疲劳的比较研究。

• 批准号: 60580099
• 负责人: MORITANI Toshio
• 金额: $ 1.34万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60580099/
• 关键词: ELECTRICAL STIMULATION; VOLUNTARY CONTRACTIONS; MUSCLE FATIGUE; EMG POWER SPECTRA; 運動単位

1. We have developed an on-line computer analysis system for studying electromyographic changes associated with muscular fatigue. The computer subroutines developed under the present study consisted of fast Fourier transform algorithm for obtaining mean power frequency and root mean square value of the surface EMG amplitude and analog-to-digital conversion programs. The system was calibrated by feeding various types of waveform and found that the above-decribed EMG parameters could be determined within 0.5% error.2. A preliminary study was undertaken to determine the relationship between stimulation frequency and muscular force output according to the procedures described by deVries et al. (1981) and Moritani et al. (1985). The results indicated that for the human triceps surae muscle group it was possible to match the force output during maximal voluntary contraction by percutaneously simulating the poterior tibial nerve with 75 - 110 V, stimulus pulse width of 500 uV at 50 - 80 Hz.3. … More To determine the relationship between muscle fiber types (Soleus and Gastrocnemius muscles) and fatigue characteristics, five male subjects were tested. It was found that force output was sharply declined in comparison to that obtained during voluntary contraction as a result of continuous high frequency (50 & 80 Hz) electrical stimulations. The recorded mass action potentials (M-wave) from the surface and intramuscular electrodes indicated that the force decline was accompanied by a progressive decline in M-wave amplitude and slowing of action potential conduction velocity, indicating the existence of impaied muscle membrane excitation.4. However, these phenomena could not be observed during sustained maximal voluntary contractions, but there were progressive motor unit (MU) firing frequency decay and mean spike amplitude decline along with significant decreases in mean power frequency of the surface EMG spectra. Since the gastrocnemius muscle with more fast-twitch fibers showed marked changes in these parameters as compared to the soleus muscle, it was suggested that the metabolic profiles of muscle might paly an important role in regulating the muscle membrane excitability during fatigue. Less

1.我们已经开发了一个在线的计算机分析系统，用于研究与肌肉疲劳相关的肌电变化。本研究开发的计算机子程序包括快速傅立叶变换算法和模数转换程序，其中快速傅立叶变换算法用于获得表面肌电信号幅值的平均功率频率和均方根值。通过输入各种波形对系统进行校准，发现上述肌电参数的测量误差在0.5%以内.根据deVries等人（1981）和Moritani等人（1985）描述的程序进行了初步研究，以确定刺激频率和肌肉力量输出之间的关系。结果表明，对于人小腿三头肌群，在75 ~ 110 V，500 uV，50 ~ 80 Hz的脉冲宽度下，持续刺激胫后神经，可以获得与最大随意收缩时相匹配的力输出. ...更多信息 为了确定肌纤维类型（比目鱼肌和腓肠肌）和疲劳特征之间的关系，对五名男性受试者进行了测试。结果发现，由于连续高频（50和80 Hz）电刺激，与随意收缩期间获得的力输出相比，力输出急剧下降。从表面和肌内电极记录的质量动作电位（M波）表明，力的下降伴随着M波振幅的进行性下降和动作电位传导速度的减慢，表明存在受损的肌膜兴奋.然而，这些现象不能观察到持续的最大自主收缩，但有进行性运动单位（MU）的发射频率衰减和平均尖峰幅度下降沿着的平均功率频率的表面肌电谱的显着降低。由于腓肠肌的快缩纤维较多，与比目鱼肌相比，这些参数的变化明显，这表明肌肉的代谢谱可能在调节疲劳过程中的肌肉膜兴奋性中起重要作用。少

项目成果

Moritani,T.;Muro,M.: European Journal of Applied Physiology. (1987)

Moritani,T.；Muro,M.：欧洲应用生理学杂志。

Moritani,T.;Muro,M.;Kijima,A.;Berry,M.: Electromyography and Clinical Neurophysiology. 26. 147-160 (1986)

Moritani,T.；Muro,M.；Kijima,A.；Berry,M.：肌电图和临床神经生理学。

Moritani, T., and Muro, M.: "Motor unit activity and surface electromyogram power spectrum during increasing force of contraction." European Journal of Applied Physiology. (1987)

Moritani, T. 和 Muro, M.：“收缩力增加期间运动单位活动和表面肌电图功率谱。”

Moritani,T.;Muro,M.;Nagata,A.: Journal of Applied Physiology. 60(4). 1179-1185 (1986)

Moritani,T.；Muro,M.；Nagata,A.：应用生理学杂志。

Moritani, T., Muro, M., and Nagata, A.: "Intramuscular and surface electromyogram changes during muscle fatigue." Journal of Applied Physiology. 64(4). 1179-1185 (1986)

Moritani, T.、Muro, M. 和 Nagata, A.：“肌肉疲劳期间肌内和表面肌电图的变化。”