Sensitivity of trapezius electromyography to differences between work tasks -: influence of gap definition and normalisation methods

被引:121
作者
Hansson, GÅ [1 ]
Nordander, C
Asterland, P
Ohlsson, K
Strömberg, U
Skerfving, S
Rempel, D
机构
[1] Univ Lund Hosp, Dept Occupat & Environm Med, SE-22185 Lund, Sweden
[2] Lund Univ, Change Work, Lund, Sweden
[3] Univ Calif San Francisco, Dept Med, Ergon Program, San Francisco, CA 94143 USA
基金
英国医学研究理事会;
关键词
electromyography; trapezius muscle; normalisation; exposure; musculoskeletal disorders; occupational work; repetitive work;
D O I
10.1016/S1050-6411(99)00030-9
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Surface electromyography (EMG) has been used extensively to estimate muscular load in studies of work related musculoskeletal disorders, especially for the trapezius muscle. The occurrences of periods of EMG silence (gaps), the time below a predetermined threshold level (muscular rest) and Various percentiles of the amplitude distribution (APDF) are commonly used summary measures. However, the effects of the criteria used to calculate these measures (e.g., gap duration, threshold level, normalisation method) on the sensitivity of these measures to accurately differentiate work loads is not well known. Bilateral trapezius EMG was recorded, for a full workday, for 58 subjects following both maximal (MVE) and submaximal (RVE) reference contractions. Gap frequency, muscular rest, and percentiles were derived for eight fundamental work tasks. The calculations were performed using different gap duration criteria, threshold levels and normalisation methods. A gap duration of less than 1/2 s, and threshold level approximate to 0.3% MVE for gap frequency, and approximate to 0.5% MVE for muscular rest, were the criteria that optimised sensitivity to task differences. Minimal sensitivity to tasks and a high sensitivity to individuals was obtained using gap frequency with a threshold level of approximate to 1% MVE. Normalisation to RVE, rather than MVE, improved sensitivity to differences between tasks, and reduced undesirable variability. Muscular rest was more sensitive to task differences than APDF percentiles. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:103 / 115
页数:13
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