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職業上の熱曝露に対する推奨警戒限度曲線の批判的評価
Hayden W Hess1,2, M Jo Hite1, Molly E Heikkinen1
1Department of Kinesiology, Indiana University School of Public Health, Bloomington, Indiana, USA.
American journal of industrial medicine
|September 7, 2025
まとめ
湿気球体温 (WBGT) に基づく労働休憩比または代謝熱生成を調整する職業熱ストレス勧告を遵守することで,労働者の過度の体温 (Tc) を効果的に防ぐことができます. これは熱のバランスを確保し,熱の負荷を軽減します.
科学分野:
- 労働衛生と安全
- 環境生理学
- 熱ストレス管理
背景:
- 熱ストレスに関するガイドラインは,熱平衡と体温 (Tc) を38.0°C以下に保つことを目的としています.
- 現在の推奨事項は,湿気球体温 (WBGT) に基づく作業休憩比または代謝熱生成 (Hprod) を調整することです.
研究 の 目的:
- 身体の中枢温度 (Tc) の過剰な上昇を防ぐために,職業上の熱ストレス勧告の有効性を評価する.
- 熱の均衡に導くという仮説を検証する.
主な方法:
- 調整されたWBGT,Hprod,およびワーク・レスト比で4時間の熱曝露を受けた.
- 試験には6つの適合シナリオと2つの不適合シナリオが含まれており,中枢温度 (Tc) が監視されていました.
主要な成果:
- 適合した試験では,平均とピークTcはそれぞれ37. 6°Cと37. 9°Cで,試験の93%と63%が38. 0°C以下であった.
- 適合しない試験は一貫して38. 0°Cを超え,適合した試験と比較して著しく高い熱増加率を示した (0. 41°C/h対0. 08°C/h).
結論:
- 熱ストレスに関する推奨事項の遵守は,熱の均衡を効果的に促進します.
- これらのガイドラインを遵守すると,熱にさらされる労働者の過度の熱ストレスが軽減されます.
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