Occupational heat strain in a hot underground metal mine

Eric A Lutz, Rustin J. Reed, Dylan Turner, Sally R. Littau

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Objective: In a hot underground metal mine, this study evaluated the relationship between job task, physical body type, work shift, and heat strain. Methods: Thirty-one miners were evaluated during 98 shifts while performing deep shaft-sinking tasks. Continuous core body temperature, heart rate, pre-and postshift urine specific gravity (USG), and body mass index were measured. Results: Cutting and welding tasks were associated with significantly (P < 0.05) increased core body temperature, maximum heart rate, and increased postshift urine specific gravity. Miners in the obese level II and III body mass index categories, as well as those working night shift, had lower core body temperatures (P < 0.05). Conclusions: This study confirms that job task, body type, and shift are risk factors for heat strain.

Original languageEnglish (US)
Pages (from-to)388-396
Number of pages9
JournalJournal of occupational and environmental medicine
Issue number4
StatePublished - Apr 2014

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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