Predicting Heat-Induced Physiological Strain and Dehydration among Male Agricultural Workers in Eastern India: Implications of Climate Change.

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Journal of occupational and environmental medicine Pub Date : 2025-09-18 DOI:10.1097/JOM.0000000000003543

Aditya Nath, Subhashis Sahu

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Abstract

Objective: This study appraised hourly physiological strain and dehydration risk among male agricultural workers during summer paddy harvesting in eastern India, and examined associations with Wet Bulb Globe Temperature (WBGT) and individual-level risk factors.

Methods: A cross-sectional study was conducted among 200 adult males using purposive sampling over 40 days (April-June 2024) in West Bengal. Hourly WBGT, heart rate, and aural canal temperature were recorded to calculate the physiological strain index (PSI). Hydration status was assessed using urine specific gravity. Multiple linear regression identified PSI predictors.

Results: WBGT steadily predicted PSI; age amplified strain, work experience showed protection across all five hours (p < 0.001). Dehydration amplified from 16.5% to 33% (p < 0.001), and excessive sweating doubled the risk.

Conclusions: Prolonged occupational heat exposure augments physiological strain and dehydration, emphasizing the need for urgent heat mitigation approaches in agricultural workforces.

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预测热诱发生理应变和脱水的男性农业工人在印度东部：气候变化的影响。

目的：本研究评估了印度东部夏季水稻收获期间男性农业工人每小时的生理应变和脱水风险，并研究了与湿球温度（WBGT）和个人水平风险因素的关系。方法：对西孟加拉邦200名成年男性进行了为期40天（2024年4月至6月）的横断面研究。记录每小时WBGT、心率、耳道温度，计算生理应变指数（PSI）。用尿比重评估水合状态。多元线性回归确定了PSI的预测因子。结果：WBGT能稳定预测PSI；年龄放大的应变、工作经验在所有5小时内都显示出保护作用（p < 0.001）。脱水从16.5%增加到33% (p < 0.001)，过度出汗使风险增加一倍。结论：长期的职业热暴露增加了生理应变和脱水，强调了农业劳动力迫切需要热缓解方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of occupational and environmental medicine

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