低负荷静态收缩诱发屈肘肌疲劳的肌电与脑电相干性分析  

Coherence Analysis between EEG and EMG in Low-level Isometric Elbow Flexor Muscle Fatigue Contraction

作　　者：王乐军[1,2] 陆爱云[2] 郑樊慧[3] 龚铭新[1] 张磊[1] 董菲[1] 

机构地区：[1]同济大学体育部运动与健康研究中心,上海200092 [2]上海体育学院运动科学学院,上海200438 [3]上海体育科学研究所,上海200030

出　　处：《体育科学》2014年第2期40-47,共8页China Sport Science

基　　金：中央高校基本科研业务费专项资金资助(1430219025);上海体育学院研究生教育创新基金资助(YJSCX201107)

摘　　要：目的：观察低负荷静态收缩诱发屈肘肌疲劳对肱二头肌sEMG与EEG频率一致性的影响，探索低负荷静态收缩诱发屈肘肌疲劳引起运动皮层与外周肌肉活动的耦合变化情况。方法：以15名青年男性志愿者为研究对象，记录受试者以20％MVC负荷静态收缩诱发屈肘肌疲劳过程中肱二头肌表面肌电信号（sEMG）与脑电信号（EEG）。截取实验开始最前和最后4．096S数据，分别记为实验开始阶段和实验结束阶段。对开始阶段和结束阶段所记录的sEMG与脑电Fz、C5、Cz、C6、Pz导联记录EEG进行相干性分析，获取相干函数在alpha（8～12Hz）、beta（15～30Hz）、gamma（30～60Hz）频段内的值。结果：实验结束阶段内记录sEMG与C5导联EEG相干函数在beta频段内的值、sEMG与Pz导联EEG相干函数在alpha频段内的值具有显著性差异，运动结束阶段记录sEMG与EEG相干函数在相应频段内的值显著高于运动开始阶段。结论：恒定低负荷静态收缩诱发肌肉疲劳使得外周肌肉与对侧运动皮层生物电活动在beta频段内的同步性增加，中枢神经系统对运动皮层与外周肌肉活动进行调节，使得对侧运动皮层与外周肌肉活动之间的耦合性增加，对侧运动皮层与外周肌肉活动有着更为紧密的联系。这可能与疲劳后多种因素引起的皮层调节活动改变有关。Objective：The aim of this study was to examine coherence between EEG and EMG in elbow flexor muscle fatigue duration induced by low-level isometric contraction and thus to ex- plore the coupling of muscle and cortex during low-level isometric elbow flexor contraction in- duced muscle fatigue. Methods：Fifteen healthy male volunteers sustained isometric elbow flex- ion at 20% maximal level until exhaustion while their brain （EEG） and biceps brachii muscle （sEMG） activities were recorded. The initial and final 4. 096 second data were chosen and co- herence was observed between sEMG of biceps brachii muscle and EEG recorded from Fz, C5, Cz,C6,Pz electrodes in alpha （8~12 Hz）,beta （15~30 Hz） and gamma （30~60 Hz） bands. Results ： The power of both EEG and EMG increased significantly in alpha, beta, gamma frequency bands while coherence in beta band between sEMG and EEG of C5 and coherence in alpha band between sEMG and EEG of Pz increased significantly in final stage compared with initial stage. Conclusions：The coupling between contralateral sensorimotor cortex and muscle activities was enhanced as a result of constant low-level isometric fatiguing contraction. This may be related to changes of cortical regulation activities relevant to exercise-induced muscle fatigue.

关 键 词：运动性肌肉疲劳 表面肌电信号 脑电信号 相干性分析 

分 类 号：G804.6[文化科学—运动人体科学]