基于表面肌电技术对人体上肢肌肉疲劳过程中中枢共驱动的研究  

Study on Neural Co-activation during Human Upper Limb Muscle Fatigue Based on Surface Electromyography

作　　者：张肃[1] 

机构地区：[1]沈阳体育学院运动人体科学学院生理生化教研室,沈阳110102

出　　处：《中国运动医学杂志》2017年第4期290-295,共6页Chinese Journal of Sports Medicine

基　　金：辽宁省教育科学"十二五"规划2015年度研究基地专项课题(JG15ZXY09);沈阳体育学院重点体育学科资助项目(XK-FX1512);辽宁省教育厅科学技术研究一般课题(L2012412)

摘　　要：目的:使用表面肌电技术观察人体上肢近端肌肉运动疲劳过程中的中枢共驱动现象。方法:以16名非体育专业的男性大学生为研究对象,以受试者左臂为观察臂,右臂为负荷臂。负荷臂分别处于自然下垂无负荷的放松状态和连续完成负重5 kg哑铃的肘关节屈伸运动诱发疲劳状态;而观察臂手持4kg哑铃,肘关节始终保持屈曲90°,进行等长收缩直至力竭。同时使用ME6000表面肌电仪分别采集两种状态下观察臂肱二头肌和肱三头肌表面肌电信号,对时域指标积分肌电(IEMG)、均方根振幅(RMS),以及频域指标平均功率频率(MPF)、中位频率(MF)进行分析。结果:无论负荷臂处于自然放松状态还是动力性运动诱发疲劳状态,随着运动的进行,对侧观察臂肱二头肌、肱三头肌时域指标IEMG和RMS都逐渐升高(P<0.05),但是在负荷臂疲劳状态时对侧观察臂肌肉的表面肌电时域指标IEMG和RMS增加幅度更加明显(P<0.01),同时拮抗肌肱三头肌时域指标受到更强抑制;负荷臂疲劳状态下对侧观察臂肱二头肌肌电频域指标MPF和MF的变化比负荷臂自然放松状态下变化更大(P<0.01),而拮抗肌肱三头肌的变化不大。结论:一侧肢体运动诱发肱二头肌肌肉疲劳能够使对侧肢体相关肌肉表面肌电的时域指标和频域指标产生伴随性的变化,说明人体上肢近端肌肉表面肌电信号的变化具有中枢共驱动的效应。Objectives To observe the co-activation phenomenon during exercise fatigue induced bythe proximal muscles on the upper limbs. Methods Sixteen undergraduates not majoring in sports partic-ipated in this study,and their left arms were chosen as the observed arms and right arms were select-ed as the weighted arms. The weighted arm was alternatively in the state of relaxation without anyload and fatigue after bending and extending elbow joints to uphold a 5 kg dumbbell. However,the ob-served arm kept weighing a 4 kg dumbbell with 90 degrees elbow flexion until the muscles were ex-hausted. The surface electromyography of biceps brachii and triceps brachii of the observed arms wasmeasured using the ME6000. And the integrated surface electromyography（IEMG）,root of meansquare（RMS）,mean power frequency（MPF）and median frequency（MF）were further analyzed. Results The IEMG and RMS of biceps brachii and triceps brachii of the observed arms increased gradually af-ter the exercise began（P〈0.05）regardless of in the relaxed state or in the in the state of weighing a5 kg dumbbell for the weighted arm,but in the state of weighting a 5 kg dumbbell the IEMG and RMS increased more significantly（P〈0.01）,Meanwhile the electrical activities of the triceps brachii asan antagonistic muscle were intensively inhibited. The changes of MPF and MF of biceps brachii inthe observed arms were more significant in the state of exercise fatigue than in the relaxed state（P〈0.01）,but without such an impact on the triceps brachii. Conclusions The fatigue in one arm can trig-ger contingent changes in sEMG time domain and frequency domain indexes of its contralateral parallelmuscles,suggesting that sEMG changes of upper limb proximal muscles have the co-activation effect.

关 键 词：表面肌电 疲劳 中枢共驱动 积分肌电 均方根振幅 平均功率频率 中位频率 

分 类 号：R87[医药卫生—运动医学]