竞走运动中股直肌与股二头肌协调性对膝关节角度影响.docVIP

竞走运动中股直肌与股二头肌协调性对膝关节角度影响 　　摘 要: 目的:1)建立量化分析肌肉协调性的方法;2)分析肌肉协调性对运动技术 的影响。研究方法:以我国六名优秀20 km竞走运动员研究对象,同步采集运动员在3.6 m/ s和4.3 m/s直线运动时膝关节角度与股二头肌和股直肌表面肌电信号,并建立了肌电时序 特 征的定性分析和肌电数组和肌电模型相关性的定量分析肌肉协调性的方法。研究结果:股直 肌和股二头肌在肌电的时序特征上表现出明显的协调性特征,而且二者的肌电数组和肌电模 型与膝角相关性较高(?r0.70),但运动员间肌电模型一致性较差(r?=0.339)。结 论: 1)本研究采用的对竞走运动中股直肌和股二头肌肌电时序的相关性分析方法是可以作为一 种分析肌肉协调性的手段。2)竞走速度的提高引起了股直股和股二头肌的协调性下降。 对膝关节技术的影响表现为:摆动腿在后摆阶段时膝角增大、着地瞬间膝角减小。 　　关键词:同步肌电;肌肉协调性;竞走;膝关节角度 　　中图分类号:G804.2 文献标识码:A 文章编 号:1007-3612(2010)09-0049-03 　　The Coordination of Rectus Femoris and Biceps Femoris andIts Impact on Knee Joint Angle during Race Walking 　　YU Hong?yan?1, WANG Wei?xing?2,MAO Li?juan?1 　　(1. Physical Education Department of Shanghai Jiao Tong Univer sity, Shanghai 200030,China; 2. Beijing Sport University, Beijing 1000 84,China) 　　Abstract: Purpose: To find a method to analyze muscles coordination by synchron ized surface electromyography (SEMG) and its impact on event technique. Method:6 elite 20Km race walkers are selected as the subject of the study. While theyare walking in the 3.6m/s and 4.3m/s respectively, the SEMG signal of rectusfemoris(RF), biceps femoris(BF)and kneel angle in synchronous way are recorded a nd then analyzed by comparing the correlation between RF and BF SEMG signals.Co nclusion: During walking, RF and BF showed the character of coordination, and th e coefficient between kneel angle and SEMG signal is more than 0.70, but the co efficient between six athletes is low(r=0.339).Conclusion: SSEM is an effectiv e method for measuring muscular coordination. 2)There is a coordination betw een BF and RF during the walking of elite race walkers, and it can be decrease i n higher space. The impact is that support leg’s knee joint angle is smaller a nd swinging leg’s knee joint angle is bigger. 　　Key words: synchronized surface electromyography; muscle coordination; r ace walking; knee angle 　　协调性是人体重要的一项运动素质之一。如何量化分析运动过程中参与动作完成的肌肉 间的协调性以及肌肉的协调性对运动技术的影响,一直是国内外学者面临的一个难题。本研 究以竞走项目为例, 提出了一种基于同步