Mechanomyographic and electromyographic responses to eccentric and concentric isokinetic muscle actions of the biceps brachii
Mechanomyographic and electromyographic responses to eccentric and concentric isokinetic muscle actions of the biceps brachii
复制标题
对肱二头肌偏心和同心等速肌肉动作的肌力图和肌电图反应
作者：
Douglas B. Smith;T. Housh;G. Johnson;T. Evetovich;K. Ebersole;S. Perry
本研究的目的是研究前臂角速度对偏心和同心等速肌肉运动时肌力图（MMG）和肌电图（EMG）反应的影响。10名成年男性志愿者（平均±SD年龄= 23±2岁）在30°、90°和150°s−1的位置进行前臂屈肌最大偏心和同心肌运动。偏心肌运动的峰值扭矩（PT）与速度无关（P < 0.05），而同心肌运动的峰值扭矩（PT）显著降低（P < 0.05）。对于偏心和同心肌运动，MMG振幅的增加与速度相关（P < 0.05）。偏心肌和同心肌运动的肌电波幅与速度无显著差异（P < 0.05）。结果表明，PT、MMG和EMG对最大偏心和同心等速肌肉运动的反应与速度相关。©1998 John Wiley & Sons, Inc神经科学进展（英文版），1998
The purpose of the present investigation was to examine the effects of forearm angular velocity on the mechanomyographic (MMG) and electromyographic (EMG) responses to eccentric and concentric isokinetic muscle actions. Ten adult male volunteers (mean ± SD age = 23 ± 2 years) performed maximal eccentric and concentric muscle actions of the forearm flexors at 30°, 90°, and 150° s−1. There was no significant (P > 0.05) velocity‐related change in peak torque (PT) for the eccentric muscle actions, but there was a significant (P < 0.05) decrease in PT for the concentric muscle actions. For the eccentric and concentric muscle actions, there was a significant (P < 0.05) velocity‐related increase in MMG amplitude. There was no significant (P < 0.05) change in EMG amplitude across velocity for the eccentric or concentric muscle actions. The results indicated velocity‐related dissociations among the PT, MMG, and EMG responses to maximal eccentric and concentric isokinetic muscle actions. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21: 1438–1444, 1998