体育学刊

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等速运动过程中肌放电量与肌氧含量的变化特征
王国祥，黄何平

浏览次数 35810 　

(苏州大学体育学院，江苏苏州　215021)

摘要：利用表面肌电图和近红外线光谱测定技术（NIRS），在30%和50%肘关节最大性力量(MVC)两种负荷条件下，对肘关节等速运动状态下的肱二头肌和肱三头肌的肌放电量及其肌肉组织内部血红蛋白和肌红蛋白含量(oxy-Hb·Mb)的变化进行了观察。结果表明：在运动过程中肌放电量和oxy-Hb·Mb均有明显的逐步下降和表面肌电图的积分值(iEMG)逐渐升高现象，而且50%MVC组下降幅度大于30%MVC组；iEMG和oxy_Hb·Mb的变化具有明显的相关性。因此可以认为，NIRS和表面肌电图作为特异性良好的非创伤性检测手段，能够直观地反映运动中肌肉内氧的代谢与骨骼肌的收缩活动。

关键词：等速运动；肌氧含量；表面肌电图

中图分类号：G804.7文献标识码： A文章编号： 1006-7116(2005)01-0053-03

Varying characteristics of myoelectric discharge and muscle oxygen contentduring constant speed movement
WANG Guo-xiang， HUANG He-ping

(College of Physical Education，Suzhou University，Suzhou 215021，China)
Abstract: Utilizing measuring technologies of Superficial Electromyogram (sEMG) and Near Infrared Spectrum (NIRS), the authors observed and analyzed the changes of myoelectric discharge of biceps and triceps muscles and oxy-Hb·Mb inside their muscle tissues under elbow joint’s constant speed movement condition with loads of 30% and 50% MVC. The results indicated that: both myoelectric discharge and oxy-Hb·Mb showed obvious and gradual descending and sEMG showed gradual ascending during movement, and the descending magnitude of 50% MVC group was greater than that of 30% MVC group; and the changes of sEMG and oxy-Hb?Mb were provided with obvious relativity. The authors thus considered that NIRS and sEMG as non-traumatic testing means provided with excellent singularity were capable of directly reflecting the metabolism of oxygen in muscles and the contracting activities of skeletal muscle during movement.
Key words: constant speed movement； muscle oxygen content; superficial electromyogram

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