人体快速起跳动作的下肢表面肌电信号特征研究

发布时间：2018-07-11 21:24

本文选题：快速起跳 + 下肢　；参考：《中国体育科技》2017年02期

【摘要】：目的:研究计算方法和起跳方式的变化对人体下肢肌肉共激活参数的影响以及人体下肢快速起跳蹬伸动作的神经肌肉控制机理。方法:以10名男子排球运动员作为受试者,采用不同的起跳动作进行起跳,记录其运动学、动力学和表面肌电信号参数,并采用不同方法计算下肢膝关节主动肌和拮抗肌的共收缩指数,同时对不同起跳方式和收缩形式下的标准化肌电值、积分肌电值、平均功率频率等参数进行比较分析。结果:方法 1计算得到的共收缩指数显著大于方法 2和方法 3(F=29.568,P0.01),不同起跳方式(F=1.457,P=0.239)和肌肉做功形式(F=0.441,P=0.531)下的共收缩指数计算结果无显著性差异。不同肌肉做功形式下的主动肌与拮抗肌积分肌电值差异显著(P0.01),且主动肌平均功率频率有显著性差异(P0.01)。结论:不同共收缩指数计算方法对评估关节周围肌肉的共激活程度存在显著性差异,其可靠性有待进一步考证;人体快速起跳蹬伸过程中,主动肌与拮抗肌都表现出蹬伸阶段i EMG显著高于缓冲阶段的特征;主动肌在缓冲蹬伸动作的转换过程中,表面肌电信号的MPF差异显著,有可能与中枢神经系统对运动单位的控制策略有关,但有待进一步证明;而拮抗肌则没有表现出上述特征。
[Abstract]:Aim: to study the effect of calculation method and take-off mode on the coactivation parameters of human lower extremity muscle and the neuromuscular control mechanism of rapid takeoff and extension of human lower extremity. Methods: ten male volleyball players were used as subjects to take off with different take-off movements, and their kinematics, dynamics and surface electromyography parameters were recorded. Different methods were used to calculate the cocontraction index of the active and antagonistic muscles of the knee joint of the lower extremity. The standardized myoelectric value, the integral myoelectric value and the average power frequency of different take-off modes and contractions were compared and analyzed. Results: the cocontraction index calculated in method 1 was significantly higher than that in method 2 and method 3 (F _ (29. 568) P _ (0.01). There was no significant difference in the calculation results of cocontraction index under different take-off modes (F ~ (1.457) P ~ (0.239) and muscle work form (F _ (0.441U) P ~ (0.531). The mean power frequency of active muscle was significantly different from that of antagonist muscle (P0.01). Conclusion: there is significant difference between different calculation methods of cocontraction index in evaluating the degree of coactivation of periarticular muscles, and its reliability needs further research. Both active and antagonistic muscles showed that I EMG was significantly higher in pedal and extensional stage than in buffer phase, and there was significant difference in MPF of surface EMG signal during the transition of active muscle in buffered pedal and extension. It may be related to the control strategy of the central nervous system to the motor unit, but it needs to be further proved, but the antagonistic muscle does not show the above characteristics.
【作者单位】：中北大学;
【基金】：山西省软科学研究计划项目(2016041037-3) 山西省体育局科研课题(15TY115) 山西省教育科学“十二五”规划课题(GH-15040)
【分类号】：G804.2

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