Normalizing upper trapezius EMG amplitude: Comparison of different procedures
Normalizing upper trapezius EMG amplitude: Comparison of different procedures
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DOI：
10.1016/1050-6411(95)00011-9
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发表时间：
1995-12-01
影响因子：
2.5
通讯作者：
Winkel, J
中科院分区：
文献类型：
--
作者：
Bao, SH;Mathiassen, SE;Winkel, J
不同的程序已被用于正常化的上肌肌电图（EMG）的幅度。这使得研究之间的比较变得复杂。本研究的目的是调查的影响，一些常用的肌电信号归一化程序的工效学分析的结果，以及这些程序的重测重复性。在一项职业任务中，记录了上眼肌的肌电图活动。然后通过七种不同的标准化程序对EMG活动进行标准化。结果表明，在组水平上，单侧肩抬高最大自愿电（MVE）激活程序比相应的双边MVE的职业负荷估计高1.2倍。在组水平上，职业任务期间的中位负荷是1.6倍高时，表示为%MVC（最大自主收缩）从功率回归的相对力对EMG振幅比表示为%MVE确定从一个单一的最大肩部抬高。次最大参考自主电（RVE）激活的标准化在变异系数（CV：11-13%）方面与MVE标准化（CV：11- 15%）具有相似的重测重复性，但功效回归程序的CV（21-36%）要大得多。本文提供了一个基础，比较以前的研究使用不同的归一化方法，以及定性评价的归一化方法，以供将来使用。
Different procedures have been used for normalization of upper trapezius electromyographic (EMG) amplitudes. This complicates comparisons between studies. The present study aimed at investigating the influence of some commonly used trapezius EMG normalization procedures on the results of ergonomic analyses, as well as the test-retest repeatability of these procedures. EMG activity from the upper trapezius was recorded during an occupational task. The EMG activity was then normalized by seven different normalization procedures. It was shown that at the group level, a unilateral shoulder elevation maximal voluntary electrical (MVE) activation procedure gave 1.2 times higher occupational load estimates than a corresponding bilateral MVE. At the group level, the median load during the occupational task was 1.6 times higher when expressed as %MVC (maximal voluntary contraction) obtained from a power regression of relative force on EMG amplitude than when expressed as %MVE determined from a single maximal shoulder elevation. Normalizations in terms of a submaximal reference voluntary electrical (RVE) activation had similar test-retest repeatability in terms of the coefficient of variation (CV: 11-13%) as normalizations in terms of an MVE (CV: 11-15%), but the power regression procedures had considerably larger CVs (21-36%). The paper provides a basis for comparing previous studies using different normalization methods, as well as a qualitative evaluation of normalization methods for future use.