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Developing a continuous graphical index to assess heat strain in extremely hot environments

机译：开发连续的图形索引以评估极热环境中的热应变

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摘要

Extremely hot environments are common in industrial buildings, which impose thermal risks on the homeostasis of the human body. Thermal protective clothing (TPC) also places physical and thermal burdens on workers. In order to ensure workers' health and work efficiency, a continuous graphical index is developed in this paper to assess heat strain in extremely hot environments, avoiding hard measurements of physiological parameters. To study human interaction with the indoor thermal environment, a climate chamber was constructed to simulate extremely hot environments. Twenty male sports majors were asked to perform intermittent treadmill exercise while wearing TPC. During the human trials, rectal temperature, heart rate, hand grip strength, ratings of perceived exertion, and ratings of thermal sensation were measured. The results of a two-way repeated analysis of variance revealed that the perceptual strain index (PeSI) can reflect influences of different work intensities and dry bulb temperatures on human heat tolerance. The results of a regression analysis revealed a strong correlation between the physiological strain index (PSI) and the PeSI. In addition, the results also revealed a strong correlation between the PSI and work efficiency. By fitting the continuous function, the proposed index defined the comfort limit, efficiency limit, and safety limit for manual labourers wearing TPC. Therefore, the proposed index derived from the findings can be used to assess heat strain and work efficiency of workers in extremely hot environments.
机译：工业建筑中普遍存在极热的环境，这会给人体的体内平衡带来热风险。防护服（TPC）还会给工人带来身体和热量负担。为了确保工人的健康和工作效率，本文开发了一种连续的图形索引来评估极端高温环境中的热应变，从而避免了对生理参数的严格测量。为了研究人与室内热环境的相互作用，建造了一个气候箱来模拟极热的环境。二十名男性体育专业人士被要求穿着TPC时进行间歇性的跑步机运动。在人体试验期间，测量了直肠温度，心率，握力，感知的劳累等级和热感觉等级。双向重复分析的结果表明，知觉应变指数（PeSI）可以反映出不同的工作强度和干球温度对人体耐热性的影响。回归分析的结果表明，生理应变指数（PSI）与PeSI之间具有很强的相关性。此外，结果还显示出PSI与工作效率之间有很强的相关性。通过拟合连续函数，建议的指标定义了穿着TPC的体力劳动者的舒适度极限，效率极限和安全极限。因此，从调查结果中得出的建议指标可用于评估极端高温环境中工人的热应变和工作效率。

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