Tötösy de Zepetnek J E, Gordon T, Stein R B, Zung H V
Department of Pharmacology, Heritage Medical Research Centre, University of Alberta, Edmonton, Canada.
Can J Physiol Pharmacol. 1991 Nov;69(11):1774-83. doi: 10.1139/y91-262.
The relationship between motor unit force and the recorded voltage produced by activated muscle unit fibres (electromyogram, EMG) was examined in normal and reinnervated rat tibialis anterior muscles. The number, cross-sectional area, and radial distance from the recording electrode of muscle fibres in a given unit, obtained directly from a sample of glycogen-depleted motor units, were analysed in relation to the magnitude of the EMG signal produced by that unit. EMG peak to peak amplitude and area varied as approximately the square root of twitch force in both normal and reinnervated units. Furthermore, the EMG amplitude increased approximately as the total cross-sectional area of the motor unit (number of muscle fibres x the average cross-sectional area of the fibres) and inversely with approximately the square root of the distance of fibres from the recording electrodes on the surface of the muscle.
在正常和重新神经支配的大鼠胫前肌中，研究了运动单位力与激活的肌肉单位纤维产生的记录电压（肌电图，EMG）之间的关系。直接从糖原耗尽的运动单位样本中获取给定单位内肌肉纤维的数量、横截面积以及距记录电极的径向距离，并分析其与该单位产生的EMG信号大小的关系。在正常和重新神经支配的单位中，EMG峰峰值幅度和面积均随抽搐力的平方根而变化。此外，EMG幅度大约随运动单位的总横截面积（肌纤维数量×纤维的平均横截面积）增加，并且与纤维距肌肉表面记录电极距离的平方根成反比。
