ArticleBMC public health2025
Development of the equivalent air temperature index (EATI) among male workers under hot and dry and hot and humid climatic conditions.
Article in BMC public health, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundMany environmental indices lack a clear association with the parameters under evaluation, making interpretation difficult. As such, using equivalent air temperature as a more comprehensible metric may enhance its precision. Therefore, the present study aimed to develop an equivalent air temperature index (EATI) among male workers in hot-dry and hot-humid climatic conditions.
methodsA total of 101 male participants from an industrial facility in a hot and dry region, along with 93 males from another industry in a hot and humid region, voluntarily participated in this cross-sectional study. They rested in a cool environment for 30 min. Then, they returned to their workplace and perform their routine work for 90 min. At the end of the work period, their physiological parameters such as heart rate and auricular temperature were measured. Additionally, the environmental parameters were measured, and metabolic rate and clothing thermal insulation were estimated. Subsequently, a novel index was developed by equating five factors to air temperature. To assess the validity of the index, a linear regression analysis was conducted to examine its relationship with auricular temperature and heart rate.
resultsBased on the results, the EATI explained 71%, 70%, and 64% of the variation in auricular temperature (°C) in the hot and dry region, hot and humid region, and both region,, respectively (R
conclusionsThe study confirms that the equivalent air temperature index can effectively evaluate thermal strain by considering radiant temperature, humidity, wind speed, and estimated metabolic rate and clothing insulation. This index appears valid for both hot and dry regions as well as hot and humid regions.
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