骨骼肌不同速度离心收缩时肌力与sEMG交互特征  

Features of Muscle Force and sEMG during Isokinrtic Eccentric Contraction in Different Speed

作　　者：刘耀荣[1] 

机构地区：[1]西安体育学院田径教研室,西安710068

出　　处：《西安体育学院学报》2008年第5期65-68,共4页Journal of Xi'an Physical Education University

摘　　要：目的探讨骨骼肌在不同速度离心收缩过程中力矩、功率输出及神经支配活动特性。方法12名男性受试着,在ISOMED2000等速测力系统上分别以60°/s和180°/s的角速度完成离心收缩,用ME6000无线肌电遥测系统同步测试受试者股外侧肌、股二头肌肌电信号。结果屈伸肌群在60°/sec、180°/sec离心用力时力矩、功、功率均随速度增大而增加(P<0.01)。sEMG显示,股外侧肌和股二头肌都被相应的动员,伸肌肌电各参数普遍高于屈肌。iEMG随速度增加而下降,RMS、MF和MPF都随运动速度增加而增加。结论在自主性离心收缩过程中,随着收缩速度的加快,力矩、做功增加,但肌电活性(iEMG)降低,与向心收缩不同,离心收缩有着独特的力量输出和神经支配方式。Purpose： To investigate the features of muscle torque, power and nerve acting in different eccentric contraction speed. Methods： 12 male subjects are being tested respectively to complete the eccentric contraction at the angular speed of 60 °/s and the 180 °/s. The vastus lateralis （VL）arld biceps femoris（BF）myo- electrical signal are tested by with ME6000 wireless sEMG Testing System synchronization. Results： It shows that the Torque, Work and power at 60 °/sec, 180 °/sec increased with the movement speed correspondence. The sEMG shows that flexor and extensor were all activated, the extensor sEMG was higher than flexr ; iEMG decreased with the speed increase but RMS, MF and MPF increased. Conclusions： In eccentric contraction, torque and power increase with contraction speed increase, but myo- electricity activeness （iEMG） reduces, Being different from the concentric contraction, the eccentric contraction has the unique force output and nerve control way.

关 键 词：离心收缩 等速练习 屈伸肌 SEMG 力量输出 神经活动 

分 类 号：G821.014.23[文化科学—体育训练]