Heat exposure limits for young unacclimatized males and females at low and high humidity.
Little is known about the separate and combined influences of humidity conditions, sex, and aerobic fitness on heat tolerance in unacclimatized males and females. The purpose of the current study was to describe heat tolerance, in terms of critical WBGT (WBGTcrit), in unacclimatized young males and...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 19; no. 7; pp. 415 - 425 |
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| Autores principales: | , , |
| Formato: | equations & formulas research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Jul2022
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=158877787&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 158877787 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Jul2022 vid: 19 iid: 7 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 158877787 156764080 158877787 158877787 10.1080/15459624.2022.2076859 158877787 ppf: 415 ppct: 10 formats: fmt: @attributes: type: P tig: atl: Heat exposure limits for young unacclimatized males and females at low and high humidity. aug: au: Wolf, S. Tony Bernard, Thomas E. Kenney, W. Larry affil: Department of Kinesiology, The Pennsylvania State University, University Park, Pennsylvania sug: subj: Environmental Exposure Analysis Humidity Heat Acclimatization Evaluation Men In Adulthood Women In Adulthood Human Male Female Young Adult Body Temperature Heat Stress Disorders Exercise Test Sex Factors Body Temperature Regulation Male Female ab: Little is known about the separate and combined influences of humidity conditions, sex, and aerobic fitness on heat tolerance in unacclimatized males and females. The purpose of the current study was to describe heat tolerance, in terms of critical WBGT (WBGTcrit), in unacclimatized young males and females in hot-dry (HD) and warm-humid (WH) environments. Eighteen subjects (9 M/9F; 21 ± 2 yr) were tested during exercise at 30% V̇O2max in a controlled environmental chamber. Progressive heat stress exposures were performed with either (1) constant dry-bulb temperature (Tdb) of 34 and 36 °C and increasing ambient water vapor pressure (Pa) (Pcrit trials; WH); or (2) constant Pa of 12 and 16 mmHg and increasing Tdb (Tcrit trials; HD). Chamber Tdb and Pa, and subject esophageal temperature (Tes), were continuously monitored throughout each trial. After a 30-min equilibration period, progressive heat stress continued until subject heat balance could no longer be maintained and a clear rise in Tes was observed. Absolute WBGTcrit and WBGTcrit adjusted to a metabolic rate of 300 W (WBGT300), and the difference between WBGTcrit and occupational exposure limits (OEL; ΔOEL) was assessed. WBGTcrit, WBGT300, and ΔOEL were higher in WH compared to HD (p < 0.0001) for females but were the same between environments for males (p ≥ 0.21). WBGTcrit was higher in females compared to males in WH (p < 0.0001) but was similar between sexes in HD (p = 0.44). When controlling for metabolic rate, WBGT300 and ΔOEL were higher in males compared to females in WH and HD (both p < 0.0001). When controlling for sex, V̇O2max was not associated with WBGT300 or ΔOEL for either sex (r ≤ 0.12, p ≥ 0.49). These findings suggest that WBGTcrit is higher in females compared to males in WH, but not HD, conditions. Additionally, the WBGTcrit is lower in females, but not males, in HD compared to WH conditions. pubtype: Academic Journal doctype: equations & formulas research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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