Jones K E, Lyons M, Bawa P, Lemon R N
School of Kinesiology, Simon Fraser University, Burnaby, BC, Canada.
Exp Brain Res. 1994;100(3):503-8. doi: 10.1007/BF02738409.
The recruitment order of motoneurons of first dorsal interosseous (1DI) muscle has been shown to be the same during either isometric abduction or flexion of the index finger. However, it is not known whether this stereotyped recruitment is the same for all functional tasks. This question was addressed by using the 1DI muscle, which contributes to many functional tasks involving the hand and fingers. Single motor units and surface electromyographic activity were recorded from 1DI in three human subjects. Each subject performed tasks of abduction of the index finger, rotation to unscrew a threaded knob and pincer to close a spring-loaded clip. The same motor units were activated for each of the three tasks, providing no evidence for the existence of task groups. The order of recruitment of pairs of selected motor units was the same for each of the three tasks.
研究表明，在食指等长外展或屈曲过程中，第一背侧骨间肌（1DI）运动神经元的募集顺序是相同的。然而，尚不清楚这种刻板的募集模式在所有功能任务中是否都相同。本研究通过使用1DI肌肉来解决这个问题，该肌肉参与了许多涉及手部和手指的功能任务。在三名人类受试者中记录了1DI的单个运动单位和表面肌电图活动。每个受试者执行食指外展、旋转拧开带螺纹旋钮以及用钳子夹闭弹簧夹的任务。在这三项任务中，相同的运动单位被激活，没有证据表明存在任务组。在这三项任务中，所选运动单位对的募集顺序是相同的。
