Trontelj J V
University Institute of Clinical Neurophysiology, University Medical Centre of Ljubljana, Slovenia.
Muscle Nerve. 1993 May;16(5):506-12. doi: 10.1002/mus.880160512.
While recording activity from individual muscle fibers by single fiber EMG (SFEMG), stimulated either through their axons or directly, the length of the recorded muscle fiber was changed--stretched or made shorter--by manipulating the recording needle or by passive joint movements. This resulted in significant changes of latency corresponding to an increase in propagation velocity on shortening of the muscle fiber and to a slowing of its lengthening. The maximum increase in velocity was estimated to 33% and slowing to about 22%. These length-dependent changes of muscle fiber propagation velocity are suggested to contribute to the supernormal phase of propagation velocity recovery function and to be responsible for an important part of the myogenic, interdischarge interval-dependent, jitter.
在通过单纤维肌电图（SFEMG）记录单个肌纤维的活动时，无论是通过其轴突刺激还是直接刺激，通过操纵记录针或被动关节运动来改变所记录肌纤维的长度——拉伸或缩短。这导致潜伏期发生显著变化，对应于肌纤维缩短时传播速度增加以及肌纤维伸长时传播速度减慢。速度的最大增加估计为33%，减慢约为22%。这些肌纤维传播速度的长度依赖性变化被认为有助于传播速度恢复功能的超常期，并对肌源性、放电间期依赖性抖动的重要部分负责。
