Non-invasive analysis of recruitment properties of human motor units using electrical muscle stimulation

这项研究的目的是测试是否可以通过使用电肌肉刺激来非侵入性地确定人类运动单位的招募特性。具体地说，在6-S自愿力产生前后，在静息肌上施加单一的电脉冲，然后测定由于自愿力产生而引起的电诱发收缩反应的“放大”。结果表明，增强的幅度代表了根据“大小原理”预测的肌肉随意收缩过程中快速抽动肌肉纤维的招募特性。

The purpose of this study was to test whether recruitment properties of human motor units can be non-invasively determined by using electrical muscle stimulation. Specifically, a single electrical pulse was applied to the resting muscle before and after a 6-s voluntary force production and then the "potentiation" of electrically evoked contractile response due to the voluntary force production was determined. The results suggest that the magnitude of potentiation represents the recruitment properties of fast-twitch muscle fibers during voluntary muscle contraction predicted from the "size principle".