CONDUCTION-VELOCITY AND EMG POWER SPECTRUM CHANGES IN FATIGUE OF SUSTAINED MAXIMAL EFFORTS
CONDUCTION-VELOCITY AND EMG POWER SPECTRUM CHANGES IN FATIGUE OF SUSTAINED MAXIMAL EFFORTS
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DOI：
10.1152/jappl.1981.51.5.1300
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发表时间：
1981-01-01
影响因子：
3.3
通讯作者：
ROUSSOS, CS
中科院分区：
文献类型：
--
作者：
BIGLANDRITCHIE, B;DONOVAN, EF;ROUSSOS, CS
本文研究了人拇收肌疲劳和非疲劳收缩时肌电功率谱与肌传导速度之间的关系。通过傅立叶变换分析和通过比较高（130-238 Hz）和低（20-40 Hz）频带中的功率来测量EMG功率谱的变化。自主活动期间，通过对神经进行周期性最大冲击诱发的肌肉质量动作电位的变化来测量传导速度的变化。通过保持60 s疲劳最大自主收缩（涉及30-50%的力损失）或在不存在疲劳的情况下改变肌肉温度，这是独立变化的。这两种程序导致功率谱的类似变化。在EMG中产生相等变化所需的传导速度的变化为在没有疲劳的情况下比在任何初始肌肉温度下开始的60秒最大收缩期间观察到的大10倍。在疲劳的最大自愿收缩，个别肌纤维动作电位的波形变化以外的因素显然必须有助于观察到的总表面EMG频率分量的移位。
The relationship between the electromyographic (EMG) power spectrum and muscle conduction velocity was investigated during both fatiguing and nonfatiguing contractions of the adductor pollicis muscle in humans. Changes in the EMG power spectrum were measured by Fourier transform analysis and by comparing the power in the high (130-238 Hz) and low (20-40 Hz) frequency bands. Changes in conduction velocity were measured during voluntary activity from changes in the muscle mass action potential evoked by periodic maximal shocks to the nerve. This was varied independently either by maintaining a 60-s fatiguing maximal voluntary contraction involving 30-50% loss of force or by changing muscle temperature in the absence of fatigue. Both procedures resulted in similar changes in the power spectrum. The change in conduction velocity required to generate equal changes in the EMG was .apprx. 10 times greater in the absence of fatigue than those observed during a 60-s maximum contraction initiated at any initial muscle temperature. During fatigue of maximal voluntary contractions, factors other than changes in the wave form of individual muscle fiber action potentials apparently must contribute to the observed shift in the total surface EMG frequency components.