摘要
目的测试股四头肌进行最大等长收缩时,不同膝关节屈曲角度对股四头肌和腘绳肌收缩时肌电活动和力矩产生的影响。方法10名健康成人在3个不同膝关节角度(分别为30°、60°、90°)下进行膝伸展的最大等长收缩,利用Cybex等速测试系统测试下肢股四头肌产生的力矩,并应用表面肌电仪测试股四头肌和腘绳肌的神经肌电活动。结果在膝关节屈曲60°时,股四头肌的力矩值比其他角度明显增大(P<0.01),但股四头肌在3个屈曲角度时的神经肌电活动差异无统计学意义;而腘绳肌的神经肌电活动在膝关节屈曲90°时最大。结论在特定膝关节角度进行股四头肌和腘绳肌最大等长收缩训练可帮助维持膝关节的稳定性。
Objective To test the effect of different flexion angles of knee joint on the myoelectric activity and torque of quadriceps femoris and hamstring muscle when these muscles contracting. Methods Electromyographic activities and isometric torque measurements were performed on 10 healthy subjects at 30°, 60° and 90° of knee joint flexion. Results The results indicated that the greatest maximal voluntary isometric contracture-torque of quadriceps femoris occurred during knee extension at 60° of knee flexion （ P〈0.01）. However, no significant relationship of maximal voluntary isometric contracture-electromyography and maximal voluntary isometric contracture-torque of quadriceps femoris were found in 10 subjects. But when knee joint was at 90° flexion, hamstring muscle had a greatest neuro-myoelectric activity. Conclusion The exercise of maximal voluntary isometric contraction of quadriceps femoris and hamstrings muscles at certain knee joint angle can help to maintain the stability of knee joint.
出处
《中国康复理论与实践》
CSCD
2007年第6期581-582,共2页
Chinese Journal of Rehabilitation Theory and Practice
关键词
膝关节
主动肌
拮抗肌
共同收缩
表面肌电仪
屈曲角度
knee joint angle
agonistic muscle,antagonistic muscle,co-activation
surface electromyography
