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

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

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
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, 2019, 189-189

ISBN
978-90-9032023-6

Skup
The 18th International Conference on Environmental Ergonomics

Mjesto i datum
Amsterdam, Nizozemska, 07.07.2019. - 12.07.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
predicted heat strain model, extremely hot environment, clothing insulation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Tekstilna tehnologija

POVEZANOST RADA