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肱二头肌在不同负荷及不同速度收缩时的肌电变化
EMG Changes of Biceps Femoris Muscle during Contraction with Different Loads and at different Speeds
【摘要】 对肱二头肌在不同负荷及不同速度收缩时的肌电变化进行了观察。结果发现,肱二头肌进行快收缩(每秒钟一次的速度屈时)和慢收缩(每两秒种一次的速度屈肘)时的IEMG 在3种负荷中(5kg、10kg、15kg),无论是疲劳前还是疲劳后,均没有明显的差异;在3种负荷工作中,肱二头肌进行动力性收缩(5kg、10kg)至疲劳时,其IEMG 值较疲劳前明显增高;当负荷为15kg 时,IEMG 值疲劳后明显下降;在所有负荷到疲劳时MPF 下降。
【Abstract】 The study made an observation of electromyograph changes of biceps femoris muscle duringcontraction with different loads and at different speeds.The results indicated:the IEMG during fast con-traction(one elbow flexion each second) and slow contraction (one elbow flexion every two seconds) withthree loads (5kg,10kg,15kg) did not show significant difference whether before or after fatigue;the MPFof fast contraction before fatigue was larger than that of slow contraction:the IEMG during dynamic con-traction to fatigue (5kg,10kg) was significantly larger than that before fatigue;with the loading of 15kg.the IEMG after fatigue significantly decreased:the MPF decreased during contraction to fatigue at allloadings.
【Key words】 EMG; MPF; IEMG; bicepsfemoris muscle; contraction speed; output work; FT; ST;
- 【文献出处】 北京体育学院学报 , 编辑部邮箱 ,1993年03期
- 【被引频次】26
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