A maximal isokinetic pedalling exercise for EMG normalization in cycling
A maximal isokinetic pedalling exercise for EMG normalization in cycling
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DOI：
10.1016/j.jelekin.2007.11.013
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发表时间：
2009-06-01
影响因子：
2.5
通讯作者：
Ditroilo, Massimiliano
中科院分区：
文献类型：
--
作者：
Fernandez-Pena, Eneko;Lucertini, Francesco;Ditroilo, Massimiliano
等长最大自主收缩(IMVC)主要用于肌电归一化，这是一种科学文献中描述的程序，目的是比较不同肌肉和受试者之间的肌肉活动。然而，iMVC的使用有一定的限制。因此，本研究的目的是提出一种新的用于自行车运动中肌电幅度归一化的方法，并评估其可靠性。23名自行车手在自行车测功机上进行了10次最大等速试验(MIP)，然后进行了另外4次次最大速度试验，同时记录了四个腿部肌肉的肌电活动。在10次试验中，功率输出(CV=2.19)和肌电活动(CV在4.46~8.70之间)相当稳定。此外，它们的最大值在第4次试验中达到。在次最大测试方案中，肌电活动随运动强度的增加而增加。MIP需要踏板动作所涉及的肌肉的最大动态收缩，正常化过程在与下一次测试过程相同的生物力学条件下进行。因此，它具有高度的自行车特异性。MIP具有良好的逻辑有效性和受试者内的重复性。对于自行车运动中的肌电归一化来说，三次试验就足够了。(C)2007爱思唯尔有限公司。保留所有权利。
An isometric maximal voluntary contraction (iMVC) is mostly used for the purpose of EMG normalization, a procedure described in the scientific literature in order to compare muscle activity among different muscles and subjects. However, the use of iMVC has certain limitations. The aims of the present study were therefore to propose a new method for the purpose of EMG amplitude normalization in cycling and assess its reliability. Twenty-three cyclists performed 10 trials of a maximal isokinetic protocol (MIP) on a cycle ergometer, then another four sub-maximal trials, whilst the EMG activity of four lower limbs muscles was registered. During the 10 trials power output (CV = 2.19) and EMG activity (CV between 4.46 and 8.70) were quite steady. Furthermore, their maximal values were reached within the 4th trial. In sub-maximal protocol EMG activity exhibited an increase as a function of exercise intensity.MIP entails a maximal dynamic contraction of the muscles involved in the pedalling action and the normalization session is performed under the same biomechanical conditions as the following test session. Thus, it is highly cycling-specific.MIP has good logical validity and within-subject reproducibility. Three trials are enough for the purpose of EMG normalization in cycling. (C) 2007 Elsevier Ltd. All rights reserved.