摘要
目的:观察在"拉长—缩短周期"运动中肌肉离心收缩和向心收缩后的疲劳、损伤状况和下肢髋、膝、踝关节的用力特征,为运动训练和预防损伤提供理论参考。方法:11名健康男性受试者通过确立的疲劳运动模型进行力竭性"拉长—缩短周期"运动,通过测试肌电图、关节用力分布特征和关节力量的变化评价SSC过程中肌肉离心、向心收缩阶段的疲劳损伤特征。结果:1)SSC运动后,肌肉向心收缩期的能力迅速降低,运动后10 min左右恢复,在运动后2 d4、d基本保持在同一水平;而离心阶段呈现出延迟性降低的特征。2)既定运动模型中,制动和爆发用力的蹲起阶段,膝关节承受的负荷最大。3)肌肉离心收缩后EMG和CK活性都呈现延迟性恢复的特征。结论:力竭性SSC运动中的离心收缩更容易造成肌肉的延迟性疼痛,且肌肉疲劳后恢复较慢。肌肉在向心收缩阶段,没有出现的明显的延迟性肌肉疼痛和/或损伤。力竭性SSC运动中膝关节是承受负荷的主要关节;髋关节和踝关节表现出对膝关节运动能力减弱的补偿性增长,共同构成下肢完成技术动作的协调机制。
Objective： The purpose of the present study is to investigate the effect of muscle fatigue and injury and lower limb joint power contribution after exhaustive stretch-shortening cycle （SSC） exercise, so as to supply some reference for training and prevention. Methods ： 11 healthy male volunteers participate in the SSC fatigue model, assesses characteristics of fatigue and injury in eccentric and concentric phase via EMG, joint contribution and joint peak power in eccentric and concentric phase. Results 1 ） Muscle concentric performance decreases immediately after exhaustive SSC, recovers within 10min and remains at the same level follow up 2 and 4 days. However, recovery delays after eccentric contraction. 2） Knee joint endures the heaviest loads in aforementioned exercise model. 3） EMG and CK activity shows delayed recovery symptom after eccentric contraction of SSC. Conclusion： Eccentric contraction in exhaustive SSC induces DOMS obviously, and recovers slowly. However, there＇s no obvious DOMS or injury symptom after concentric phase. Knee joint extensors are the main generators during SSC, and the hip and ankle joint contribution increases so as to compensate for the lost knee joint function. All of aforementioned points make up of coordinate mechanism of lower limb.
出处
《北京体育大学学报》
CSSCI
北大核心
2008年第10期1361-1364,1433,共5页
Journal of Beijing Sport University
关键词
拉长—缩短周期运动
运动控制
肌肉疲劳
肌肉损伤
stretch-shortening cycle exercise
motor control
muscle fatigue
muscle injury
作者简介
徐飞，在读博士研究生，研究方向运动分子生物学。
通讯作者：胡扬
