极限运动对肌电信号的影响。
Effects of supramaximal exercise on the electromyographic signal.
作者信息
Hunter A M, St Clair Gibson A, Lambert M I, Nobbs L, Noakes T D
机构信息
MRC/UCT Research Unit of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape town, South Africa.
出版信息
Br J Sports Med. 2003 Aug;37(4):296-9. doi: 10.1136/bjsm.37.4.296.
Abstract
AIM
To determine the neuromuscular recruitment characteristics during supramaximal exercise.
METHODS
Ten healthy subjects completed the Wingate anaerobic test (WAT) cycling protocol. Electromyographic (EMG) data and rate of fatigue were recorded throughout the cycling.
RESULTS
The mean (SD) rate of fatigue (decrease in power output) was 44.5 (8.6)%. No significant change was found in EMG amplitude. A significant decrease (p<0.01) in mean power frequency spectrum was found over the 30 second period.
CONCLUSIONS
During WAT, mean power frequency spectrum was attenuated with no decline in EMG amplitude, which may be caused by an accumulation of metabolites in the periphery. However, it is also possible that the feedback loop from intramuscular metabolism to the central nervous system is unable, within the 30 second period of the WAT, to affect neural recruitment strategy.
摘要
目的
确定超最大运动期间的神经肌肉募集特征。
方法
10名健康受试者完成了温盖特无氧测试（WAT）骑行方案。在整个骑行过程中记录肌电图（EMG）数据和疲劳率。
结果
疲劳率（功率输出下降）的平均值（标准差）为44.5（8.6）%。EMG幅度未发现显著变化。在30秒期间，平均功率频谱显著下降（p<0.01）。
结论
在WAT期间，平均功率频谱衰减而EMG幅度无下降，这可能是由于外周代谢产物的积累所致。然而，也有可能在WAT的30秒期间，从肌肉内代谢到中枢神经系统的反馈回路无法影响神经募集策略。
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