Common drive in motor units of a synergistic muscle pair
Common drive in motor units of a synergistic muscle pair
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DOI：
10.1152/jn.00793.2001
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发表时间：
2002-04-01
影响因子：
2.5
通讯作者：
Erim, Z
中科院分区：
文献类型：
--
作者：
De Luca, CJ;Erim, Z
研究了人桡侧腕长伸肌（ECRL）和尺侧腕伸肌（ECU）在伸腕过程中作为协同者的运动单位之间的相互作用。使用特殊的四股针电极获得肌内记录。在20-30%的最大努力等长腕伸展进行了研究。将肌电信号分解为包含信号的单个运动单元动作电位序列。运动单位之间的相互作用的特点是估计随时间变化的平均放电率和运动单位对的随时间变化的平均放电率之间的互相关。考虑了每块肌肉内的成对运动单元以及肌肉上的成对运动单元。同相共同波动，被称为共同驱动，观察到在每个肌肉内的运动单位的平均放电率，与其他肌肉的早期工作一致。在ECU和ECRL发动机单元的点火率之间也观察到共同的波动，尽管具有可变的相移。协同肌肉之间存在共同驱动力，这意味着中枢神经系统认为肌肉作为一个功能单位时，他们作为协同。
The interaction among the motor units of the extensor carpi radialis longus (ECRL) and the extensor carpi ulnaris (ECU) muscles in man was studied during wrist extensions in which the two muscles acted as synergists. Intramuscular recordings were obtained using special quadrifilar needle electrodes. Isometric wrist extensions at 20-30% of the maximal effort were studied. The electromyographic (EMG) signals were decomposed into the individual motor-unit action potential trains comprising the signal. The interaction among motor units were characterized by the estimated time-varying mean firing rate and the cross-correlation between the time-varying mean firing rates of pairs of motor units. Pairs of motor units within each muscle as well as pairs of motor units across the muscles were considered. In-phase common fluctuations, termed common drive, were observed in the mean firing rates of motor units within each muscle, consistent with earlier work on other muscles. Common fluctuations were also observed between the firing rates of ECU and ECRL motor units albeit with a variable phase shift. The existence of common drive across synergistic muscles was interpreted as implying that the CNS considers the muscles as a functional unit when they act as synergists.