Fatigue-related electromyographic coherence and phase synchronization analysis between antagonistic elbow muscles
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- 作者：Lejun Wang ; Aiyun Lu ; Shengnian Zhang ; Wenxin Niu…
- 关键词：Muscle fatigue ; Antagonistic muscles ; Coherence ; Phase synchronization
- 刊名：Experimental Brain Research
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：233
- 期：3
- 页码：971-982
- 全文大小：990 KB
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Shengnian Zhang (2)
Wenxin Niu (3)
Fanhui Zheng (4)
Mingxin Gong (1)
1. Sport and Health Research Center, Physical Education Department, Tongji University, Shanghai, China
2. School of Kinesiology, Shanghai University of Sport, Shanghai, China
3. School of Medicine, Tongji University, Shanghai, China
4. Physical Education and Sports Science Institute of Shanghai, Shanghai, 200030, China - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Biomedicine
Neurosciences
Neurology - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-1106
文摘
The aim of this study was to examine coherence and phase synchronization between antagonistic elbow muscles and thus to explore the coupling and common neural inputs of antagonistic elbow muscles during sustained submaximal isometric fatiguing contraction. Fifteen healthy male subjects sustained an isometric elbow flexion at 20?% maximal level until exhaustion, while surface electromyographic signals (sEMG) were collected from biceps brachii (BB) and triceps brachii (TB). sEMG signals were divided into the first half (stage 1 with minimal fatigue) and second half (stage 2 with severe fatigue) of the contraction. Coherence and phase synchronization analysis was conducted between sEMG of BB and TB, and coherence value and phase synchronization index in alpha (8-2?Hz), beta (15-5?Hz) and gamma (35-0?Hz) frequency bands were obtained. Significant increase in EMG–EMG coherence and phase synchronization index in alpha and beta frequency bands between antagonistic elbow flexion muscles was observed all increased in stage 2 compared to stage 1. Coupling of EMG activities between antagonistic muscles increased as a result of fatigue caused by 20?% maximal level sustained isometric elbow flexion, indicating the increased interconnection between synchronized cortical neurons and the motoneuron pool of BB and TB, which may be cortical in origin. This increased coupling may help to maintain coactivation level so as to ensure joint stability on the basis of maintaining the joint force output.