Bosch T, de Looze M P, van Dieën J H
TNO Quality of Life, 2130 AS, Hoofddorp.
Ergonomics. 2007 Feb;50(2):161-77. doi: 10.1080/00140130600900282.
Optimization of the temporal aspects of task design requires a better understanding of the development of muscle fatigue in the neck and shoulder region over time. The objective of the study was to investigate this in two production companies and to determine the relationship between objective and subjective estimates of fatigue. Indicators of fatigue were obtained through electromyography (EMG) during test contractions and ratings of perceived discomfort. EMG amplitude increased during the day in both case studies while mean power frequency decreased only in one case. In both cases, a more detailed frequency analysis of the EMG signals showed an increase in lower frequency power accompanied by a decrease in higher frequency power. Local perceived discomfort in the neck and shoulder increased over the course of the day in both cases. However, no clear relationship between perceived discomfort and objective indicators of fatigue was found. Obtaining sufficient sensitivity to detect effects of temporal aspects of task design probably requires complementary or more refined methods (e.g. EMG arrays, mechanomyography).
任务设计时间方面的优化需要更好地理解颈部和肩部区域肌肉疲劳随时间的发展情况。本研究的目的是在两家生产公司中对此进行调查，并确定疲劳的客观和主观评估之间的关系。通过测试收缩期间的肌电图（EMG）和感知不适评分获得疲劳指标。在两个案例研究中，EMG幅度在一天中均有所增加，而平均功率频率仅在一个案例中下降。在这两个案例中，对EMG信号进行更详细的频率分析显示，低频功率增加，高频功率降低。在这两个案例中，颈部和肩部的局部感知不适在一天中都有所增加。然而，未发现感知不适与疲劳客观指标之间存在明确关系。要获得足够的敏感性以检测任务设计时间方面的影响，可能需要补充或更精细的方法（例如EMG阵列、机械肌电图）。
