Smith D B, Housh T J, Johnson G O, Evetovich T K, Ebersole K T, Perry S R
Center for Youth Fitness and Sports Research, School of Health and Human Performance, University of Nebraska-Lincoln, 68588-0229, USA.
Muscle Nerve. 1998 Nov;21(11):1438-44. doi: 10.1002/(sici)1097-4598(199811)21:11<1438::aid-mus11>3.0.co;2-x.
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 degrees, 90 degrees, and 150 degrees 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.
本研究的目的是检验前臂角速度对机械肌电图（MMG）和肌电图（EMG）对离心和向心等速肌肉动作反应的影响。十名成年男性志愿者（平均±标准差年龄 = 23±2岁）在前臂屈肌的最大离心和向心肌肉动作中，以30度、90度和150度/秒的速度进行。离心肌肉动作的峰值扭矩（PT）没有显著（P>0.05）的速度相关变化，但向心肌肉动作的PT有显著（P<0.05）下降。对于离心和向心肌肉动作，MMG振幅有显著（P<0.05）的速度相关增加。离心或向心肌肉动作的EMG振幅在不同速度下没有显著（P<0.05）变化。结果表明，在最大离心和向心等速肌肉动作的PT、MMG和EMG反应之间存在速度相关的分离。
