肌电图信号的 M 波归一化以研究热应激和疲劳。
M-wave normalization of EMG signal to investigate heat stress and fatigue.
机构信息
Athlete Health and Performance Research Centre, Aspetar Orthopaedic and Sports Medicine Hospital, Qatar; Institute of Sport Sciences, Lausanne University, Switzerland.
Institute of Sport, Exercise and Active Living and School of Sport and Exercise Science, Australia.
出版信息
J Sci Med Sport. 2018 May;21(5):518-524. doi: 10.1016/j.jsams.2017.07.020. Epub 2017 Jul 31.
OBJECTIVES
We examined the extent to which peripheral changes affect EMG signal adjustments during repeated sprinting in temperate and hot conditions.
DESIGN
Randomised, crossover study.
METHODS
Ten males performed 10×6-s 'all-out' cycling sprints (recovery=30s) in either a temperate (24°C/30%rH) or a hot (35°C/40%rH) environment with concomitant surface EMG recordings of the vastus lateralis (VL) and rectus femoris (RF). In addition, peak-to-peak M-wave amplitudes were obtained for each muscle after each sprint (i.e., 15s into recovery).
RESULTS
For both the VL and RF muscles RMS decreased across sprint repetitions (P<0.01), while significantly lower values for the VL (P=0.012), but not the RF (P=0.096), occurred in hot vs. temperate conditions. M-wave-normalised RMS for VL muscle decreased across sprint repetitions (P=0.030), with no condition or interaction effects (both P>0.621). M-wave-normalised RMS for the RF muscle was lower in the heat (P<0.034), with no significant sprint or interaction effects (both P>0.240).
CONCLUSIONS
Controlling for changes in maximal M-wave amplitude of the quadriceps muscles after each bout of a repeated cycling exercise in hot and temperate conditions allows researchers to account for fatigue- and/or heat-induced neural and peripheral adjustments.
目的
我们研究了在温带和热环境下重复冲刺时，外周变化对肌电图信号调整的影响程度。
设计
随机交叉研究。
方法
10 名男性在温带（24°C/30%rH）或热环境（35°C/40%rH）下进行 10 次×6 秒的“全力”自行车冲刺（恢复时间为 30 秒），同时记录股外侧肌（VL）和股直肌（RF）的表面肌电图。此外，在每次冲刺后（即恢复 15 秒后），对每块肌肉进行峰峰值 M 波幅度的测量。
结果
对于 VL 和 RF 肌肉，RMS 在冲刺重复中均降低（P<0.01），而在热环境下，VL （P=0.012）的数值明显更低，但 RF （P=0.096）则不然。VL 肌肉的 M 波归一化 RMS 随冲刺重复次数而降低（P=0.030），无条件或交互作用效应（均 P>0.621）。RF 肌肉的 M 波归一化 RMS 在热环境下较低（P<0.034），且无显著的冲刺或交互作用效应（均 P>0.240）。
结论
在热和温带条件下，对每次重复自行车运动后的股四头肌最大 M 波幅度进行控制，可以让研究人员解释疲劳和/或热诱导的神经和外周调整。
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