| 肱二头肌在不同负荷及不同速度收缩时的肌电变化 |
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| 引用本文： | 王瑞元,熊开宇,孙伟.肱二头肌在不同负荷及不同速度收缩时的肌电变化[J].北京体育大学学报,1993(3). |
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| 作者姓名： | 王瑞元 熊开宇 孙伟 |
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| 作者单位： | 北京体育学院运动生理教研室 北京100084
(王瑞元，熊开宇)，北京体育学院体育生物科学系 北京100084(孙伟) |
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| 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。
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| 关 键 词： | 肌电图(EMG) 平均功率频率(MPF) 积分肌电(IEMG) 肱二头肌 收缩速度 输出功率 快肌运动单位(FT) 慢肌运动单位(ST) |
EMG Changes of Biceps Femoris Muscle during Contraction with Different Loads and at different Speeds |
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| Wang Ruiyuan Xong Kaiyu Sun Wei Exercisee Physiology Teaching & Reasearch Section,BIPE,Beijing
Dept.of Sport Biological Sciences,BIPE.EMG Changes of Biceps Femoris Muscle during Contraction with Different Loads and at different Speeds[J].Journal of Beijing Sport University,1993(3). |
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| Authors: | Wang Ruiyuan Xong Kaiyu Sun Wei Exercisee Physiology Teaching & Reasearch Section BIPE Beijing
Deptof Sport Biological Sciences BIPE |
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| Institution: | Wang Ruiyuan~1) Xong Kaiyu~1) Sun Wei~2) 1)Exercisee Physiology Teaching & Reasearch Section,BIPE,Beijing 100084
2)Dept.of Sport Biological Sciences,BIPE |
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| 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. |
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| Keywords: | EMG MPF IEMG bicepsfemoris muscle contraction speed output work FT ST |
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