机构：[a]Sport and Health Research Center, Physical Education Department, Tongji University[b]School of Kinesiology, Shanghai University of Sport, Shanghai[c]Department of functional neurosurgery, Beijing Children’s Hospital, Capital Medical University, National Center for Children’s Health, Beijing临床科室职能科室功能神经外科临床流行病与循证医学中心神经外科首都医科大学附属北京儿童医院[d]Physical Education and Sports Science Institute of Shanghai[e]Shanghai Yangzhi Rehabilitation Hospital, Tongji University School of Medicine, Shanghai, China
During muscle fatigue, acute changes in the interaction between the sensorimotor cortex and peripheral neurons have been widely studied. However, it is still unclear about the effect of antagonist muscle prefatigue on corticomuscular coupling and central modulation. The purpose of this study was to investigate the changes in the magnitude of electroencephalogram-electromyography (EEG-EMG) coherence and phase synchronization index (PSI) induced by antagonistic muscle prefatigue.
Twelve young male volunteers conducted a 30-s long, nonfatiguing isometric elbow extension with a target force level of 20% maximum voluntary contraction (MVC) before and after a fatiguing sustained elbow flexion contraction at 20% MVC until task failure. Coherence and PSI between the EEG recorded over the sensorimotor cortex and the surface EMG of the triceps brachii (TB) muscle were quantified for the pre- and post-fatigue elbow extension contractions.
Coherence and PSI in the gamma frequency band (35-60 Hz) were found significantly decreased in the postfatigue elbow extension contraction than the prefatigue contraction. The power of the EEG in the beta and gamma band were significantly increased, while the EMG power showed no significant changes when the antagonistic muscle was prefatigued. PSI in the gamma frequency band between the EMG of the TB muscle and the EEG were found significantly decreased during postfatigue elbow extension contraction compared with prefatigue contraction.
Antagonistic muscle prefatigue led to significantly lower gamma band corticomuscular coherence and phase coupling during an isometric elbow extension position task. The lower corticomuscular coupling may indicate a central modulation mechanism of antagonist muscle prefatigue that related to decreased descending common drive or joint instability compensation modulation mechanism.
基金：
Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [1500219130]; Research and Construction Project of Teaching Reform of Tongji University; National Natural Science Foundation of ChinaNational Natural Science Foundation of China [11672211]; Science & Technology Project Foundation of Shanghai Sports Bureau [18C007]
第一作者机构：[a]Sport and Health Research Center, Physical Education Department, Tongji University[b]School of Kinesiology, Shanghai University of Sport, Shanghai[*1]Tongji University, Shanghai 200092, China
共同第一作者：
通讯作者：
通讯机构：[a]Sport and Health Research Center, Physical Education Department, Tongji University[b]School of Kinesiology, Shanghai University of Sport, Shanghai[*1]Tongji University, Shanghai 200092, China
推荐引用方式(GB/T 7714)：
Wang Lejun,Xie Zihang,Lu Aiyun,et al.Antagonistic muscle prefatigue weakens the functional corticomuscular coupling during isometric elbow extension contraction.[J].Neuroreport.2019,31(5):372-380.doi:10.1097/WNR.0000000000001387.
APA：
Wang Lejun,Xie Zihang,Lu Aiyun,Lu Tianfeng,Zhang Shengnian...&Niu Wenxin.(2019).Antagonistic muscle prefatigue weakens the functional corticomuscular coupling during isometric elbow extension contraction..Neuroreport,31,(5)
MLA：
Wang Lejun,et al."Antagonistic muscle prefatigue weakens the functional corticomuscular coupling during isometric elbow extension contraction.".Neuroreport 31..5(2019):372-380
