对最大离心等速肌肉动作的肌动图反应。

Mechanomyographic responses to maximal eccentric isokinetic muscle actions.

作者信息

Smith D B, Housh T J, Stout J R, Johnson G O, Evetovich T K, Ebersole K T

机构信息

Center for Youth Fitness and Sports Research, School of Health and Human Performance, University of Nebraska at Lincoln 68588-0229, USA.

出版信息

J Appl Physiol (1985). 1997 Mar;82(3):1003-7. doi: 10.1152/jappl.1997.82.3.1003.

DOI:10.1152/jappl.1997.82.3.1003

PMID:9074994

Abstract

The purpose of the present investigation was to examine the mechanomyographic (MMG) responses to maximal eccentric isokinetic muscle actions. Eight adult male volunteers [age 22 +/- 2 (SD) yr] performed maximal eccentric muscle actions of the leg extensors at 60, 90, 120, and 180 degrees /s on a Cybex 6000 isokinetic dynamometer. MMG was detected by a piezoelectric crystal contact sensor placed over the vastus lateralis muscle. Test-retest intraclass correlations ranged from R = 0.88 to 0.97 for peak torque and from R = 0.97 to 0.98 for root mean square MMG amplitude values. There was no significant (P > 0.05) velocity-related change in eccentric peak torque; however, there was a significant (P < 0.05) increase in MMG between 60 [119 +/- 44 (SE) mV] and 180 degrees/s (302 +/- 128 mV). These findings indicated a velocity-related dissociation between MMG and peak torque for maximal eccentric isokinetic muscle actions.

摘要

本研究的目的是检测肌动图（MMG）对最大离心等速肌肉动作的反应。八名成年男性志愿者[年龄22±2（标准差）岁]在Cybex 6000等速测力计上以60、90、120和180度/秒的速度进行腿部伸肌的最大离心肌肉动作。通过放置在股外侧肌上的压电晶体接触传感器检测MMG。重测组内相关系数在峰值扭矩方面为R = 0.88至0.97，在MMG均方根振幅值方面为R = 0.97至0.98。离心峰值扭矩没有显著的（P>0.05）速度相关变化；然而，在60[119±44（标准误）mV]和180度/秒（302±128 mV）之间，MMG有显著的（P<0.05）增加。这些发现表明，对于最大离心等速肌肉动作，MMG和峰值扭矩之间存在速度相关的分离。