EMG versus oxygen uptake during cycling exercise in trained and untrained subjects
EMG versus oxygen uptake during cycling exercise in trained and untrained subjects
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DOI：
10.1016/s1050-6411(03)00081-6
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发表时间：
2004-04-01
影响因子：
2.5
通讯作者：
Jammes, Y
中科院分区：
文献类型：
--
作者：
Hug, F;Decherchi, P;Jammes, Y
本研究的目的是检验自行车训练可以改善整体 SEMG 能量和 V-O2 之间关系的假设。我们已经展示了未经训练的受试者在骑自行车运动期间表面肌电图 (SEMG) 的均方根 (RMS) 对摄氧量 (V-O2) 的密切调整。因为在这些情况下，可能影响 SEMG 测量的神经肌肉传递改变仅发生在未经训练的个体中，因此我们寻找未经训练的受试者和训练有素的骑自行车者之间 SEMG 与 V-O2 关系的差异。每个受试者首先进行增量运动以确定 V-O2max 和通气阈值，然后进行恒定负荷阈值循环运动，持续直至精疲力竭。连续记录两侧股外侧肌的SEMG。计算 RMS。 M-Wave 被定期记录。在增量运动期间：（1）在未经训练的受试者中，RMS 增加和 V-O2 增加之间发现显着的非线性正相关性，而在受过训练的骑自行车者中，这种关系最好通过直线拟合； (2) RMS/V-O2 比率在增量训练过程中逐渐下降，其下降在训练有素的自行车运动员中显着且明显加剧； (3) 在未经训练的受试者中，试验结束时发生显着的 M 波改变。这些 M 波改变可以解释这些个体的非线性 RMS 增加。恒负荷运动期间：（1）RMS/V-O2比值最初增加后逐渐下降，运动2分钟后达到稳定水平，但组间无显着差异； (2)两组均未测量到M波变化。我们得出的结论是，从股外侧肌记录的全局 SEMG 能量可以很好地估计训练有素的自行车手在增量自行车运动期间的代谢能量消耗。 (C) 2003 Elsevier Ltd. 保留所有权利。
The aim of this study was to test the hypothesis that bicycle training may improve the relationship between the global SEMG energy and V-O2. We already showed close adjustment of the root mean square (RMS) of the surface electromyogram (SEMG) to the oxygen uptake (V-O2) during cycling exercise in untrained subjects. Because in these circumstances an altered neuromuscular transmission which could affect SEMG measurement occurred in untrained individuals only, we searched for differences in the SEMG vs. V-O2 relationship between untrained subjects and well-trained cyclists. Each subject first performed an incremental exercise to determine V-O2max and the ventilatory threshold, and second a constant-load threshold cycling exercise, continued until exhaustion. SEMG from both vastus lateralis muscles was continuously recorded. RMS was computed. M-Wave was periodically recorded. During incremental exercise: (1) a significant non-linear positive correlation was found between RMS increase and V-O2 increase in untrained subjects, whereas the relationship was best fitted by a straight line in trained cyclists; (2) the RMS/V-O2 ratio decreased progressively throughout the incremental exercise, its decline being significantly and markedly accentuated in trained cyclists; (3) in untrained subjects, significant M-wave alterations occurred at the end of the trial. These M-wave alterations could explain the non-linear RMS increase in these individuals. During constant-load exercise: (1) after an initial increase, the RMS/V-O2 ratio decreased progressively to reach a plateau after 2 min of exercise, but no significant inter-group differences were noted; (2) no M-wave changes were measured in the two groups. We concluded that the global SEMG energy recorded from the vastus lateralis muscle is a good estimate of metabolic energy expenditure during incremental cycling exercise only in well-trained cyclists. (C) 2003 Elsevier Ltd. All rights reserved.