Subthreshold electrical stimulation reduces motor unit discharge variability and decreases the force fluctuations of plantar flexion
Subthreshold electrical stimulation reduces motor unit discharge variability and decreases the force fluctuations of plantar flexion
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DOI：
10.1016/j.neulet.2012.02.020
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发表时间：
2012-04-04
影响因子：
2.5
通讯作者：
Moritani, Toshio
中科院分区：
文献类型：
--
作者：
Kouzaki, Motoki;Kimura, Tetsuya;Moritani, Toshio
本研究的目的是研究阈下电刺激对足底屈肌在低水平、稳定收缩过程中的力波动和运动单位放电变异性的影响。七名受试者进行了力量匹配任务的等距跖屈在5%的最大自愿收缩与随机电刺激施加到胫神经。在任务过程中，用细线电极连续记录运动单位动作电位，并计算单个运动单位的峰间间期。的变异系数（CV）的力波动和运动单位放电的峰间间期的干预阈下电刺激显着降低，虽然没有变化的平均值。这些结果表明，阈下刺激减少了运动单位放电的变异性，这反过来又增加了稳定的力量。(c)由Elsevier爱尔兰有限公司出版。
The purpose of this study was to examine the influence of subthreshold electrical stimulation on the force fluctuations and motor-unit discharge variability during low-level, steady contraction of the plantar flexor muscles. Seven subjects performed a force-matching task of isometric plantar flexion at 5% of maximal voluntary contraction with and without random electrical stimulation applied to the tibial nerve. During the task, the motor unit action potential was continuously recorded with fine-wire electrodes, and the inter-spike intervals of a single motor unit were calculated. The coefficient of variation (CV) of the force fluctuations and the inter-spike intervals of the motor unit discharge were significantly decreased by the intervention of subthreshold electrical stimulation, although there were no changes in the mean values. These results suggest that subthreshold stimulation reduced the motor-unit discharge variability, which in turn, increased the steadiness of the force. (c) 2012 Published by Elsevier Ireland Ltd.