性别对疲劳时扭矩、恢复、肌电图和磁机械图反应的影响。
Effect of sex on torque, recovery, EMG, and MMG responses to fatigue.
作者信息
Hill E C, Housh T J, Smith C M, Cochrane K C, Jenkins N D M, Cramer J T, Schmidt R J, Johnson G O
机构信息
Department of Nutrition and Health Sciences, Human Performance Laboratory, University of Nebraska-Lincoln, Lincoln, NE 68505, United States.
出版信息
J Musculoskelet Neuronal Interact. 2016 Dec 14;16(4):310-317.
OBJECTIVE
The purpose of the present investigation was to examine the effect of sex on maximal voluntary isometric contraction (MVIC) torque and the EMG and MMG responses as a result of fatiguing, intermittent, submaximal (65% of MVIC), isometric elbow flexion muscle contractions.
METHODS
Eighteen men and women performed MVIC trials before (pretest), after (posttest), and 5-min after (5-min recovery) performing 50 intermittent, submaximal isometric muscle contractions. Surface electromyographic (EMG) and mechanomyographic (MMG) signals were simultaneously recorded from the biceps brachii muscle.
RESULTS
As a result of the fatiguing workbout torque decreased similarly from pretest to posttest for both the men (24.0%) and women (23.3%). After 5-min of recovery, torque had partially recovered for the men, while torque had returned to pretest levels for the women. For both sexes, from pretest to posttest EMG mean power frequency and MMG amplitude decreased, but returned to pretest levels after 5-min of recovery.
CONCLUSIONS
In the present study, there were sex-related differences in muscle fatigue that were not associated with the EMG or MMG responses.
目的
本研究的目的是探讨性别对最大自主等长收缩（MVIC）扭矩以及因疲劳性、间歇性、次最大（MVIC的65%）等长屈肘肌肉收缩而产生的肌电图（EMG）和肌肉机械图（MMG）反应的影响。
方法
18名男性和女性在进行50次间歇性次最大等长肌肉收缩之前（预测试）、之后（后测试）以及之后5分钟（5分钟恢复）进行MVIC试验。同时从肱二头肌记录表面肌电图（EMG）和肌肉机械图（MMG）信号。
结果
由于疲劳运动，男性（24.0%）和女性（23.3%）的扭矩从预测试到后测试均有类似程度的下降。恢复5分钟后，男性的扭矩部分恢复，而女性的扭矩恢复到预测试水平。对于两性而言，从预测试到后测试，EMG平均功率频率和MMG振幅均下降，但恢复5分钟后恢复到预测试水平。
结论
在本研究中，肌肉疲劳存在性别相关差异，且与EMG或MMG反应无关。
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