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| 主动肌和拮抗肌功能转变瞬间的肌电平均功率频率变化 | |
| 引用本文： | 王健,杨红春,张海红.主动肌和拮抗肌功能转变瞬间的肌电平均功率频率变化[J].体育科学,2009,29(7). |
| 作者姓名： | 王健 杨红春 张海红 |
| 作者单位： | 1. 浙江大学,体育科学与技术研究所,浙江,杭州,310028 2. 浙江省体育科学研究所,浙江,杭州,310004 3. 杭州师范大学,体育健康学院,浙江,杭州,310036 |
| 基金项目： | 中-芬政府间科学技术合作项目，国家自然科学基金 |
| 摘 要： | 目的:通过对主动肌和拮抗肌功能转变瞬间肌电平均功率频率的观察,探讨中枢控制因素在决定MPF变化中的独立性作用.方法:10名健康男性志愿者在完成60%MVC强度的疲劳性等长屈肘运动负荷试验后,瞬间转变肌肉工作性质,完成60%MVC强度的疲劳性等长伸肘运动,分别记录肱二头肌和肱三头肌的sEMG信号,观察两次疲劳试验以及瞬间转变过程中肌电MPF等sENG指标变化.结果:等长屈肘和等长伸肘快速转变的瞬间,主动肌和拮抗肌MPF等各项sEMG信号分析指标均发生了显著性改变,表现出明显的跃变现象;无论是转变之前,还是转变之后的等长疲劳试验过程中,主动肌与拮抗肌的MPF、C(n)和%DEF均表现出类似的变化规律,而拮抗肌AEMG则维持相对恒定.结论:中枢运动控制是导致疲劳过程中MPF单调递减变化的独立性作用因素,其可能的作用机制是CNS将主动肌与拮抗肌作为一组控制肌群实施同步控制. |
| 关 键 词： | 平均功率频率 中枢运动控制 主动肌 拮抗肌 |
Electromyography Mean Power Frequency Alternations during Rapid Transition of Elbow Flexion to Extension |
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| WANG Jian,YANG Hong-chun,ZHANG Hai-hong.Electromyography Mean Power Frequency Alternations during Rapid Transition of Elbow Flexion to Extension[J].China Sport Science,2009,29(7). | |
| Authors: | WANG Jian YANG Hong-chun ZHANG Hai-hong |
| Abstract: | Objective:The purpose of this study was to explore the independent role of central motor control in the altemations of sEMG mean power frequency during elbow flexion to ex-tension transition. Method :10 healthy male subjects took part in the experiment, which consis-ted of two phase isometric fatigue loading exercise. In the first exercise, the subject performed elbow flexion as soon as possible under the load intensity 60% MVC, then subject performed elbow isometric extension as soon as possible. Both sEMG activities of biceps brachii and tri-ceps brachii were recorded and then mean power frequency and other parameters were calculat-ed. Result: (1) During the rapid transition phase, mean power frequency and other sEMG pa-rameters changed significantly. (2)During two phase elbow isometric contractions, both agonist and antagonist muscle showed similar activity patterns of MPF, C(n) and %DET, but AEMG remained relatively constant. Conclusion:The experimental results suggested brain central mo-tor control system displayed an independent role in the alternations of MPF of biceps brachii during fatigue exercise, the possible mechanisms was that both agonist and antagonist were to-tally controlled by the central motor control system. |
| Keywords: | mean power frequency central motor control agonist antagonist |
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