从站立姿势进行足跟抬起执行过程中比目鱼肌H反射波幅的预期变化。

Anticipatory changes of soleus H-reflex amplitude during execution process for heel raise from standing position.

作者信息

Yamashita N, Moritani T

机构信息

Laboratory of Human Motor System, College of Liberal Arts and Sciences, Kyoto University, Japan.

出版信息

Brain Res. 1989 Jun 19;490(1):148-51. doi: 10.1016/0006-8993(89)90441-1.

DOI:10.1016/0006-8993(89)90441-1

PMID:2758322

Abstract

Soleus (SOL) H-reflex amplitude changes before the EMG onset of that muscle were compared between simple plantar flexion (SPF) and heel raise from standing position (STM). Results indicated that (1) the SOL H-reflex amplitude decreased during the STM but not the SPF, (2) in the STM, anticipatory EMG activity in the antagonist tibialis anterior (TA) appeared before the EMG onset of the agonist (SOL) and the onset corresponded to the initiation of the decreasing SOL H-reflex, and (3) EMG reaction time of the SOL in the STM was significantly longer than in the SPF. These results suggest that the decreasing SOL H-reflex amplitude is caused by the reciprocal inhibition originating from the postural synergy, the TA. The functional significance of the decreased SOL H-reflex amplitude might lead to a delay in the activation of focal musculature.

摘要

比较了比目鱼肌（SOL）在简单跖屈（SPF）和从站立位提踵（STM）时该肌肉肌电图（EMG）起始前的Hoffmann反射（H反射）幅度变化。结果表明：（1）在STM过程中SOL的H反射幅度降低，而在SPF过程中未降低；（2）在STM中，拮抗肌胫骨前肌（TA）的预期EMG活动在主动肌（SOL）的EMG起始之前出现，且该起始与SOL的H反射降低的开始相对应；（3）STM中SOL的EMG反应时间明显长于SPF中的。这些结果表明，SOL的H反射幅度降低是由来自姿势协同肌TA的交互抑制引起的。SOL的H反射幅度降低的功能意义可能导致局部肌肉组织激活延迟。