Method for quantitatively assessing physical risk factors during variable noncyclic work
Method for quantitatively assessing physical risk factors during variable noncyclic work
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DOI：
10.5271/sjweh.742
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发表时间：
2003-10-01
影响因子：
6.3
通讯作者：
Merlino, LA
中科院分区：
文献类型：
--
作者：
Anton, D;Cook, TM;Merlino, LA
目的评估在可变的非周期性工作中暴露于身体危险因素可能是有问题的。方法对重型机械作业工人(n=25)和机械工(n=25)两组工人的指屈肌肌电活动进行采样，以确定在正常作业中用力运动的强度和持续时间。使用三个强度和两个持续时间类别对暴露差异分析(EVA)进行了修改，称为集群EVA(CEVA)，从而减少了数据。结果CEVA能够量化变量的非循环作业量，并对两组的作业量进行了对比，简单效应在所有暴露类别中有显著差异。机械师有9.1%的时间进行高强度的短时间收缩，而操作员只有1.8%的时间有类似的收缩。相反，操作员超过81%的时间使用持续时间较长的低强度收缩，而机械操作只有43%。结论CEVA是EVA的一个有用的修改，用于对比建筑等未被研究的行业中典型的非循环工作。肌电图的简化和诸如CEVA的摘要测量提供了一种可理解的、但准确的测量工作任务中的用力的方法。
Objectives Assessing exposure to physical risk factors during variable noncyclic work can be problematic. The purpose of this study was to modify an existing data reduction method for directly quantifying physical exposures during variable noncyclic work.Methods Myoelectric activity of the finger flexors of two groups of workers, heavy equipment operators (N=25) and mechanics (N=25), was sampled to determine the intensity and duration of forceful exertions during normal tasks. Data were reduced with a modification of the exposure variation analysis (EVA), called clustered EVA (CEVA), using three intensity and two duration categories. A two-way, mixed-effects, repeated-measures analysis of variance evaluated the percentage of sampled work time in each CEVA category.Results CEVA was able to quantify variable noncyclic work, and it contrasted the work of the two groups, with simple effects significantly different for all the exposure categories. The mechanics performed high-intensity short-duration contractions 9.1% of the time, whereas the operators had similar contractions only 1.8% of the time. Conversely, the operators used low-intensity contractions of prolonged duration over 81% of the time, compared with only 43% for the mechanics.Conclusions CEVA is a useful modification of EVA for contrasting the noncyclic work typical of understudied industries like construction. A simplification of electromyography with summary measures such as CEVA provides a comprehensible, yet accurate measure of forceful exertions during worktasks.