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Electromyographic power spectial anelysis during isometric contiaction of the brachial muscle

肱肌等长接触过程中的肌电功率谱分析

基本信息

批准号：
12832066
负责人：
HACHISUKA Kenji
金额：
$ 1.15万
依托单位：
University of Occupational and Environmental Health
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12832066/
关键词：
skeletal muscle EMG triceps brachii muscle power speotial anslysio muscle endurance spinal cord injury wheelchair marsthon 上腕筋等尺性収縮中心周波数平均パワー周波数

项目摘要

Objective and Design : To investigate the endurance features of triceps brachii muscles in elite paraplegic wheelchair marathon athletes using the surface electromyographic power spectral analysis. Method : Electromyograms of the right triceps brachii muscles during isometric contraction at the level of 50% maximal voluntary contraction were obtained by using surface electrodes from 9 male elite paraplegic wheelchair marathon athletes and 6 male paraplegic non-athletes as a control. Outcome Measures : Median frequency (MF) and mean power frequency (MPF) in the electromyograms were calculated with a personal computer using the ME3000P Fast Fourier Transform spectrum analysis program. Pearson's correlation coefficients between MF and time and between MPF and time, and the rates of changes in MF and MPF were calculated. Results : MF and MPF decreased with time linearly. The negative slopes of MF and MPF were -8.9±4.6 and -9.7±4.6 %/min for the athletes, and -22.3±8.2 and -21.2±6.4 %/min for the controls, and the absolute values of the negative slopes in the athletes were significantly smaller than those in the controls (p<0.05). Conclusion : The electromyographic power spectral analysis revealed that the triceps brachii muscles in the athletes are more endurable because of a smaller decrease in MF and MPF.

目标与设计：运用表面肌电功率谱分析方法，研究优秀截瘫轮椅马拉松运动员肱三头肌的耐力特征。方法：采用表面电极法，对9名优秀男性截瘫轮椅马拉松运动员和6名男性截瘫非运动员的右侧肱三头肌在50%最大随意收缩水平下进行等长收缩时的肌电描记。结果测量：用ME 3000 P快速傅立叶变换频谱分析程序计算肌电图的中位频率（MF）和平均功率频率（MPF）。计算MF与时间、MPF与时间的Pearson相关系数以及MF和MPF的变化率。结果：MF和MPF随时间呈线性下降。运动员MF和MPF的负斜率分别为-8.9 ~4.6和-9.7 ~4.6%/min，对照组为-22.3 ~8.2和-21.2 ~6.4%/min，运动员负斜率的绝对值明显小于对照组（p<0.05）。结论：肌电功率谱分析结果表明，运动员肱三头肌的肌电强度和肌电强度下降幅度较小，具有较强的耐力。