屈膝肌群在不同起始角度下的募集特征分析

目的:探讨在不同起始角度下,股后肌群与腓肠肌群参与屈膝动作的募集程度与动员顺序,为运动训练、运动康复的运动处方设计提供建议.方法:20例健康成年男子在坐姿屈膝训练器上,以5个起始角度做负荷为1RM(1次重复最大负荷)的80％屈膝动作3次,采集其屈膝肌群的表面肌电图.结果:①在同一起始角度下,屈膝动作中各肌群的募集比例一...

The mechanical and sEMG analysis of related muscles as knee flexion at different initial angle

Objective:To investigate the recruitment order of and work by hamstrings and gastrocnemius in the knee flexion with different starting angles,and provides suggestion for the design of rehabilitation training program.Method:Twenty healthy adult men were subjected to 3 times of 80%of 1 RM(one Repetition Maximum)knee flexion at 5 initial angles on the isokenetic training apparatus,and sEMG were picked up from medial and lateral hamstrings and gastrocnemius at the same time.Result:(1)As knee flexion starting angle from 35 to 15 degree,in both concentric and eccentric contractions,the work of four muscles was consistent,and the medial hamstrings always contributed the largest proportion(P<0.01),but the medial gastrocnemius contribution increased gradually during the eccentric cotraction.As starting from 5 degree,medial gastrocnemius contribution increased to the most(P<0.05)and media hamstrimgs decreased to the leased(P<0.05).(2)At the same starting angle,the medial hamstrings was always the first mobilized(P<0.05);As the initial knee flexion angle decreases gradually,the medial gastrocnemius recruitment advances gradually(P<0.05),and there was nothing change in the other muscles.Conclusion:As the hip angle fixed,and the knee flexion start angle from 35°to 5°,in both concentric and eccentric knee flexion,the work and recruitment order of hamstrings and gastrocnemuius do not change,the media hamstrings starts first and contributes the most work.When approaching full knee extension,the medial gastrocnemius will significantly increase the recruitment ratio and start first.It could be the suggestion for the rehabilitation program such as hamstrings injury.