| SWEAT RATE PREDICTION EQUATIONS FOR OUTDOOR EXERCISE WITH TRANSIENT SOLAR RADIATION. | |
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MedLine Citation:
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PMID: 22241058 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We investigated the validity of employing a fuzzy piecewise prediction equation (PW) [J Appl Physiol, 107:379, 2009] defined by sweat rate (m(sw), g•m(-2)•h(-1)) = 147+1.527• (E(req)) - 0.87• (E(max)), which integrates evaporation required (E(req)) and the maximum evaporative capacity of the environment (Emax). Heat exchange and physiological responses were determined throughout the trials. Environmental conditions were: ambient temperatures, T(a) = 16°C - 26°C, relative humidity,RH=51 - 55%, and wind speed (V) = 0.5 - 1.5 m•s(-1). Volunteers wore military fatigues (clothing evaporative potential (i(m) /clo) =0.33) and carried loads (15-31 kg) while marching 14-37 km over variable terrains either at night (N=77, Trials 1-5) or night + increasing daylight (N=33, Trials 6&7). PW was modified (Pw,sol) for transient solar radiation (R(sol), watts) determined from measured solar loads and verified in Trials 6&7. PW provided a valid m(sw) prediction during night trials (1-5) matching previous laboratory values and verified by bootstrap correlation (r(bs) of 0.81, SE±0.014,SEE=±69.2 g•m(-2)•h(-1)). For Trials 6 &7, E(req) and E(max) components included Rsol applying a modified equation Pw,sol, in which m(sw) = 147+1.527• (E(req), sol) - 0.87• (E(max)). Linear prediction of m(sw) = 0.72•P w,sol +135 (N=33) was validated (R2=0.92;SEE=±33.8 g•m(-2)•h(-1)) with PW β-coefficients unaltered during field marches 16°C ≤ T(a) ≤ 26°C for m(sw) ≤700 g•m-2•h(-1). PW was additionally derived for cool laboratory/night conditions (Ta <20°C) in which E(req) is low but E(max) is high as: PW, cool (g •m(-2) • h(-1)) = 350 + 1.527 • Ereq - 0.87• E(max). These sweat prediction equations allow valid tools for civilian, sports and military medicine communities to predict water needs during a variety of heat stress/exercise conditions. |
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Authors:
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Richard R Gonzalez; Samuel N Cheuvront; Brett R Ely; Daniel S Moran; Amir Hadid; Thomas L Endrusick; Michael N Sawka |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-12 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: - ISSN: 1522-1601 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1New Mexico State University. |
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