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Predicted Heat Strain (PHS) model predicts the evaporative water loss well in an extremely hot climate (CROSBI ID 678671)

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Halder, Amitava ; Kuklane, Kalev ; Petersson, Jakob ; Hursa Šajatović, Anica ; Gao, Chuansi Predicted Heat Strain (PHS) model predicts the evaporative water loss well in an extremely hot climate // Abstract book International Conference on Environmental Ergonomics 2019 / Gerrett, Nicola M. ; Daanen, Hein A.M. ; Teunissen, Lennart P.J. (ur.). Amsterdam: International Society for Environmental Ergonomics, 2019. str. 189-189

Podaci o odgovornosti

Halder, Amitava ; Kuklane, Kalev ; Petersson, Jakob ; Hursa Šajatović, Anica ; Gao, Chuansi

engleski

Predicted Heat Strain (PHS) model predicts the evaporative water loss well in an extremely hot climate

Introduction: The aim was to study if the evaporative water loss can be predicted enough accurately for hydration recommendations by ISO 7933 – Predicted Heat Strain (PHS) model during a student laboratory exercise in an extremely hot environment. Method: Twelve young healthy students (8 males and 4 females), unacclimatized to heat, were exposed in a climatic chamber at 50˚C, 30% relative humidity and 0.4 m·s-1 air velocity for 45 minutes. They had a mean (SD) age of 25.1 (2.6) years, height 175.6 (6.9) cm, weight 72.3 (11.0) kg, VO2max 54.9 (6.5) mL·min-1·kg-1, and HRmax 194 (6) bpm. The men and women performed bicycling for 6-minutes at workloads of 150 and 100 Watts (W), when the metabolic rates (M)calculated found 363 and 290 W·m-2, respectively. Moreover, the students did step test at 60 steps·min-1 for 5- minutes with estimated M being 215 W·m-2. They were standing most of the time (34 min) (M = 80 W·m-2). Time weighted average M for males and females were 133 and 123 W·m-2, respectively, for the whole exposure duration. Clothing insulation, Icl = 0.4 clo and moisture permeability index, im = 0.42 were input to PHS model simulation. The actual water loss by evaporation was determined by subject’s dressed body weight difference before and after exposure. Results: The actual mean (SD) total water evaporated was 461.3 (176.7) g. The predicted total water loss was 427.4 (39.2) g by the PHS model. There was no significant (p = .514) difference between the actual and the predicted water loss. Conclusions: PHS model appears to be reliable to foresee the evaporative water loss in short-term exposure at 50˚C in young healthy students. The results suggest that ISO 7933 – PHS model is a useful tool to predict the risk of dehydration and plan for drinking in extremely hot climates.

predicted heat strain model, extremely hot environment, clothing insulation

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Podaci o prilogu

189-189.

2019.

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objavljeno

978-90-9032023-6

Podaci o matičnoj publikaciji

Abstract book International Conference on Environmental Ergonomics 2019

Gerrett, Nicola M. ; Daanen, Hein A.M. ; Teunissen, Lennart P.J.

Amsterdam: International Society for Environmental Ergonomics

Podaci o skupu

The 18th International Conference on Environmental Ergonomics

poster

07.07.2019-12.07.2019

Amsterdam, Nizozemska

Povezanost rada

Tekstilna tehnologija

Poveznice