Department of Society, Human Development and Health, Harvard School of Public Health, Boston, MA, USA.
J Occup Environ Med. 2012 May;54(5):598-603. doi: 10.1097/JOM.0b013e31824af5a8.
The assessment of workplace physical load is highly resource intensive. This study tested whether a single-item measure asking individuals about perceived physical strain (PPS) at work was an acceptable proxy for physical load.
The study was conducted in a subset of the GAZEL cohort (n = 2612) undergoing assessment of exposure to 38 occupational biomechanical constraints (representing eight domains) in 1994. Test-retest reliability analyses compared PPS in 1994 and 1995. Validity analyses compared PPS in 1994 to concurrent strains assessed in the more extensive measure.
The measure showed adequate test-retest reliability. Within and across domains of physical load, linear relationships (P < 0.0001) existed between n exposures and PPS. Domains considered more strenuous (carrying loads, pulling objects) showed the highest PPS.
Perceived physical strain approximates physical load in the absence of detailed measures. Perceived physical strain could be used in nonoccupational epidemiologic studies.
工作场所体力负荷的评估需要耗费大量资源。本研究旨在检验询问个体工作中感知到的体力紧张程度（PPS）的单项测量是否可以作为体力负荷的替代指标。
该研究在 1994 年进行的 GAZEL 队列研究的一个子集中进行（n=2612），评估了 38 种职业生物力学约束（代表 8 个领域）的暴露情况。测试-重测信度分析比较了 1994 年和 1995 年的 PPS。效度分析比较了 1994 年的 PPS 与更广泛测量中同时评估的紧张程度。
该测量具有足够的测试-重测信度。在体力负荷的各个领域内和之间，n 种暴露与 PPS 之间存在线性关系（P<0.0001）。被认为更费力的领域（搬运货物、拉动物体）表现出更高的 PPS。
在没有详细测量的情况下，感知到的体力紧张程度近似于体力负荷。感知到的体力紧张程度可用于非职业性流行病学研究。
