Effect of muscle relaxation of the foot on simultaneous contraction of contralateral hand
Effect of muscle relaxation of the foot on simultaneous contraction of contralateral hand
复制标题
足部肌肉松弛对对侧手同时收缩的影响
DOI：
10.1016/j.neulet.2016.09.019
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Kazuyuki Kanosue
中科院分区：
文献类型：
--
作者：
Kouki Kato;and Kazuyuki Kanosue
我们研究了足部肌肉放松和收缩对同侧和对侧手部肌肉活动的影响。受试者坐在扶手椅上，双手处于旋前位置。他们能够自由移动左右手和脚。他们执行了同侧（右手和右脚）和对侧肢体协调（左手和右脚总共六项任务）的三项任务。这些任务涉及：（1）从弯曲（休息）位置伸展手腕，（2）从跖屈（休息）位置伸展手腕并同时踝关节背屈，以及（3）从背屈位置伸展手腕并同时放松踝关节。受试者在听到开始信号后尽快执行每项任务。根据肌电图 (EMG) 观察，腕伸肌收缩的反应时间（即，其先于运动反应时间的程度）在与踝背屈肌放松同时进行时会变得更长。此外，与单独进行腕伸肌收缩或与踝背屈肌收缩时的活动相比，肌电图活动的幅度变小。这些影响不仅在同侧手上观察到，而且在对侧手上也观察到。我们的研究结果表明，一侧肢体的肌肉松弛会干扰同侧和对侧肢体的肌肉收缩。
We investigated the effects of foot muscle relaxation and contraction on muscle activities in the hand on both ipsilateral and contralateral sides. The subjects sat in an armchair with hands in the pronated position. They were able to freely move their right/left hand and foot. They performed three tasks for both ipsilateral (right hand and right foot) and contralateral limb coordination (left hand and right foot for a total of six tasks). These tasks involved: (1) wrist extension from a flexed (resting) position, (2) wrist extension with simultaneous ankle dorsiflexion from a plantarflexed (resting) position, and (3) wrist extension with simultaneous ankle relaxation from a dorsiflexed position. The subjects performed each task as fast as possible after hearing the start signal. Reaction time for the wrist extensor contraction (i.e. the degree to which it preceded the motor reaction time), as observed in electromyography (EMG), became longer when it was concurrently done with relaxation of the ankle dorsiflexor. Also, the magnitude of EMG activity became smaller, as compared with activity when wrist extensor contraction was done alone or with contraction of the ankle dorsiflexor. These effects were observed not only for the ipsilateral hand, but also for the contralateral hand. Our findings suggest that muscle relaxation in one limb interferes with muscle contraction in both the ipsilateral and contralateral limbs.