膝关节最大和次最大等速运动至疲劳过程中主动肌与拮抗肌肌电特征分析

发布时间：2018-06-01 00:54

本文选题：膝关节 + 疲劳　；参考：《中国组织工程研究》2015年33期

【摘要】：背景:人体关节力量输出主要取决于关节周围主动肌与拮抗肌的激活效果,而拮抗肌通过共激活形式参与肢体活动,从而协助维持关节稳定性。但是肌肉不同收缩模式下拮抗肌共激活的不同中枢策略的报道较少。目的:观察健康受试者膝关节伸肌在最大和次最大等速运动至疲劳过程中主动肌与拮抗肌表面肌电信号的特征与差别。方法:对16名在校学生使用Biodex等速训练仪诱发下肢右侧膝关节伸肌等速屈伸运动直至疲劳,同时使用表面肌电仪采集单侧股内侧肌、股外侧肌以及股二头肌的表面肌电信号。分析时域指标均方根振幅百分比以及频域指标平均频率的变化规律。结果与结论:在膝关节最大等速屈伸运动中峰值力矩下降了40.3%(P0.05),主动肌活动先增加后下降(P0.05),而拮抗肌电活动保持不变。在次最大等速运动中峰值力矩平均下降了40.0%(P0.05),主动肌肌电活动逐渐增加(P0.05),而拮抗肌电活动先增加随后又降低。在指定的交互收缩屈伸运动中作为拮抗肌的股内和股外侧肌的均方根振幅和平均频率没有显著变化(P0.05)。结果提示,在不同强度的等速疲劳运动中中枢神经系统对主动肌和拮抗肌采取了不同神经支配策略。
[Abstract]:Background: the output of human joint strength mainly depends on the activation effect of peripheral active muscle and antagonist muscle. Antagonist muscle participates in limb activity through co-activation to help maintain joint stability. However, there are few reports of different central strategies that antagonize the co-activation of muscle in different contraction modes. Aim: to observe the characteristics and differences of surface electromyography (EMG) between active and antagonistic muscles during maximal and submaximal isokinetic exercise to fatigue of knee extensor muscle in healthy subjects. Methods: Biodex isokinetic training instrument was used to induce isokinetic flexion and extension of the right knee extensor of lower extremity to fatigue. Surface electromyograph was used to collect the surface electromyography of unilateral medial femoral muscle, lateral femoral muscle and biceps femoris. The variation law of the mean square amplitude percentage of time domain index and the average frequency of frequency domain index is analyzed. Results and conclusion: in the maximal isokinetic flexion and extension of the knee joint, the peak torque decreased by 40.3%, and the active muscle activity increased first and then decreased (P 0.05), while the antagonistic myoelectric activity remained unchanged. The peak torque decreased by 40.0P0.05 in the second largest isokinetic motion, and the active myoelectric activity increased gradually, while the antagonistic myoelectric activity increased first and then decreased. There was no significant change in root-mean-square amplitude and mean frequency of medial and lateral femoris muscles as antagonists in a given cross-contractile flexion and extension exercise (P 0.05). The results suggest that the central nervous system (CNS) with different intensities of isokinetic fatigue has different innervation strategies for active and antagonistic muscles.
【作者单位】：沈阳体育学院运动生理教研室;沈阳体育学院足球教研室;
【基金】：辽宁省科学“十二五”规划2015年度研究基地专项课题(JG15ZXY09)~~
【分类号】：R87

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