自主收缩后放松过程中的机电延迟成分：可靠性及疲劳的影响
Electromechanical delay components during relaxation after voluntary contraction: reliability and effects of fatigue.
作者信息
Cè Emiliano, Rampichini Susanna, Venturelli Massimo, Limonta Eloisa, Veicsteinas Arsenio, Esposito Fabio
机构信息
Department of Biomedical Sciences for Health, University of Milan, Via G. Colombo 71, 20133, Milan, Italy.
Center of Sport Medicine, Don Gnocchi Foundation, Milan, Italy.
出版信息
Muscle Nerve. 2015 Jun;51(6):907-15. doi: 10.1002/mus.24466. Epub 2015 Apr 24.
INTRODUCTION
Fatigue effects on total relaxation delay (R-DelayTOT ) components and measurement reliability were investigated.
METHODS
Electromyogram (EMG), force (F), and mechanomyogram (MMG) were recorded during maximum voluntary contraction from the biceps brachii muscle before and after fatigue. The delays between EMG cessation and onset of F decay (R-EMD), between F decay and onset of MMG largest displacement (MMG p-p) (R-Δt F-MMG), from the beginning to the end of MMG p-p (R-Δt MMGp-p ), and from the end of MMG p-p to F cessation (R-Δt MMG-Fend ) were calculated.
RESULTS
R-DelayTOT lasted 366 ± 10 ms. R-EMD, R-Δt F-MMG, R-Δt MMGp-p , and R-Δt MMG-Fend accounted for 6%, 8%, 59%, and 27% of R-DelayTOT , respectively. After fatigue, R-DelayTOT , R-EMD, R-Δt F-MMG, and R-Δt MMGp-p increased by 38%, 22%, 40%, 40%, and 38%, respectively (P<0.05). Reliability was very high (0.853-0.960).
CONCLUSIONS
R-Δt MMGp-p was the main contributor to R-DelayTOT . Fatigue affected all R-DelayTOT contributors, with a smaller effect on R-EMD.
引言
研究了疲劳对总松弛延迟（R-DelayTOT）各组成部分及测量可靠性的影响。
方法
在肱二头肌最大自主收缩过程中，记录疲劳前后的肌电图（EMG）、力量（F）和机械肌电图（MMG）。计算EMG停止与F衰减开始之间的延迟（R-EMD）、F衰减与MMG最大位移开始之间的延迟（MMG p-p）（R-Δt F-MMG）、从MMG p-p开始到结束的延迟（R-Δt MMGp-p）以及从MMG p-p结束到F停止的延迟（R-Δt MMG-Fend）。
结果
R-DelayTOT持续366±10毫秒。R-EMD、R-Δt F-MMG、R-Δt MMGp-p和R-Δt MMG-Fend分别占R-DelayTOT的6%、8%、59%和27%。疲劳后，R-DelayTOT、R-EMD、R-Δt F-MMG和R-Δt MMGp-p分别增加了38%、22%、40%、40%和38%（P<0.05）。可靠性非常高（0.853 - 0.960）。
结论
R-Δt MMGp-p是R-DelayTOT的主要贡献因素。疲劳影响了所有R-DelayTOT的贡献因素，对R-EMD的影响较小。
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