在有或没有血流限制的疲劳运动中，神经肌肉和平均力的变化

IF 0.6 Q3 VETERINARY SCIENCES

Comparative Exercise Physiology Pub Date : 2022-12-02 DOI:10.3920/cep220023

C. Proppe, P. Rivera, E. Beltran, E. Hill

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引用次数: 0

摘要

表面肌电图(EMG)和平均力可以用来识别运动单元的兴奋和疲劳。与低负荷阻力训练(LL)相比，低负荷阻力训练与血流限制(LL+BFR)可能导致更早的疲劳和最大肌纤维的补充。本研究的目的是检查LL和LL+BFR期间的肌电图和力反应。13名男性(平均±标准差= 24±4岁)以其1次重复最大LL和LL+BFR的30%完成了一次腿部伸展肌运动(1×30)，同时记录了力、肌电信号振幅和肌电信号平均工频(EMG MPF)。在两种情况下，肌电振幅增加(74.2%)，肌电强积金减少(22.6%)。LL+BFR前3次重复的平均力(477.3±132.3 N)与LL(524.3±235.1 N)无显著差异，但LL+BFR后3次重复的平均力(459.7±179.3 N)低于LL(605.4±276.4 N)。本研究结果表明，LL和LL+BFR进行腿伸展肌疲劳动作时引起的神经肌肉反应相似。在最后3次重复中，平均力有显著差异(LL>LL+BFR)，这可能是由于在接近峰值力的时间上的差异。

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Neuromuscular and mean force changes during a fatiguing bout of exercise with and without blood flow restriction

Surface electromyography (EMG) and mean force can be used to identify motor unit excitation and fatigue. Low-load resistance training with blood flow restriction (LL+BFR) may result in earlier fatigue and maximal muscle fibre recruitment compared to low-load resistance training (LL). The purpose of this investigation was to examine EMG and force responses during LL versus LL+BFR. Thirteen males (mean ± standard deviation = 24±4 years) completed a bout (1×30) of leg extension muscle actions at 30% of their 1 repetition maximum LL and LL+BFR while force, EMG amplitude, and EMG mean power frequency (EMG MPF) were recorded. EMG amplitude increased (74.2%) and EMG MPF decreased (22.6%) similarly during both conditions. There was no significant difference in mean force during the first 3 repetitions between LL+BFR (477.3±132.3 N) and LL (524.3±235.1 N) conditions, but mean force was lower during the last 3 repetitions for LL+BFR (459.7±179.3 N) compared to LL (605.4±276.4 N). The results of the present study indicated that a fatiguing bout of leg extension muscle actions performed LL and LL+BFR elicited similar neuromuscular responses. There was a significant difference in mean force during the last 3 repetitions (LL>LL+BFR) that may have been due to differences in the time spent near peak force.

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来源期刊

Comparative Exercise Physiology VETERINARY SCIENCES-

CiteScore

1.50

自引率

11.10%

发文量

期刊介绍： ''Comparative Exercise Physiology'' is the only international peer-reviewed scientific journal specifically dealing with the latest research in exercise physiology across all animal species, including humans. The major objective of the journal is to use this comparative approach to better understand the physiological, nutritional, and biochemical parameters that determine levels of performance and athletic achievement. Core subjects include exercise physiology, biomechanics, gait (including the effect of riders in equestrian sport), nutrition and biochemistry, injury and rehabilitation, psychology and behaviour, and breeding and genetics. This comparative and integrative approach to exercise science ultimately highlights the similarities as well as the differences between humans, horses, dogs, and other athletic or non-athletic species during exercise. The result is a unique forum for new information that serves as a resource for all who want to understand the physiological challenges with exercise.