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Can the PHS model (ISO7933) predict reasonable thermophysiological responses while wearing protective clothing in hot environments?

Wang, Faming LU ; Kuklane, Kalev LU ; Gao, Chuansi LU and Holmér, Ingvar LU (2011) In Physiological Measurement 32(2). p.239-249
Abstract
In this paper, the prediction accuracy of the PHS (predicted heat strain) model on human physiological responses while wearing protective clothing ensembles was examined. Six human subjects (aged 29 ± 3 years) underwent three experimental trials in three different protective garments (clothing thermal insulation Icl ranges from 0.63 to 2.01 clo) in two hot environments (40 °C, relative humidities: 30% and 45%). The observed and predicted mean skin temperature, core body temperature and sweat rate were presented and statistically compared. A significant difference was found in the metabolic rate between FIRE (firefighting clothing) and HV (high visibility clothing) or MIL (military clothing) (p < 0.001). Also, the development of heart... (More)
In this paper, the prediction accuracy of the PHS (predicted heat strain) model on human physiological responses while wearing protective clothing ensembles was examined. Six human subjects (aged 29 ± 3 years) underwent three experimental trials in three different protective garments (clothing thermal insulation Icl ranges from 0.63 to 2.01 clo) in two hot environments (40 °C, relative humidities: 30% and 45%). The observed and predicted mean skin temperature, core body temperature and sweat rate were presented and statistically compared. A significant difference was found in the metabolic rate between FIRE (firefighting clothing) and HV (high visibility clothing) or MIL (military clothing) (p < 0.001). Also, the development of heart rate demonstrated the significant effects of the exposure time and clothing ensembles. In addition, the predicted evaporation rate during HV, MIL and FIRE was much lower than the experimental values. Hence, the current PHS model is not applicable for protective clothing with intrinsic thermal insulations above 1.0 clo. The results showed that the PHS model generated unreliable predictions on body core temperature when human subjects wore thick protective clothing such as firefighting clothing (Icl > 1.0 clo). The predicted mean skin temperatures in three clothing ensembles HV, MIL and FIRE were also outside the expected limits. Thus, there is a need for further extension for the clothing insulation validation range of the PHS model. It is recommended that the PHS model should be amended and validated by individual algorithms, physical or physiological parameters, and further subject studies. (Less)
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author
organization
publishing date
type
Contribution to specialist publication or newspaper
publication status
published
subject
keywords
PHS model, heat stress, thermoregulatory modeling, protective clothing, hot environment
categories
Popular Science
in
Physiological Measurement
volume
32
issue
2
pages
239 - 249
publisher
IOP Publishing
external identifiers
  • wos:000286458500007
  • scopus:79551498696
ISSN
0967-3334
DOI
10.1088/0967-3334/32/2/007
language
English
LU publication?
yes
id
4478f02f-6c1d-4897-8151-4bc6a872ba81 (old id 1858761)
date added to LUP
2011-03-28 15:34:15
date last changed
2017-10-29 03:17:04
@misc{4478f02f-6c1d-4897-8151-4bc6a872ba81,
  abstract     = {In this paper, the prediction accuracy of the PHS (predicted heat strain) model on human physiological responses while wearing protective clothing ensembles was examined. Six human subjects (aged 29 ± 3 years) underwent three experimental trials in three different protective garments (clothing thermal insulation Icl ranges from 0.63 to 2.01 clo) in two hot environments (40 °C, relative humidities: 30% and 45%). The observed and predicted mean skin temperature, core body temperature and sweat rate were presented and statistically compared. A significant difference was found in the metabolic rate between FIRE (firefighting clothing) and HV (high visibility clothing) or MIL (military clothing) (p &lt; 0.001). Also, the development of heart rate demonstrated the significant effects of the exposure time and clothing ensembles. In addition, the predicted evaporation rate during HV, MIL and FIRE was much lower than the experimental values. Hence, the current PHS model is not applicable for protective clothing with intrinsic thermal insulations above 1.0 clo. The results showed that the PHS model generated unreliable predictions on body core temperature when human subjects wore thick protective clothing such as firefighting clothing (Icl &gt; 1.0 clo). The predicted mean skin temperatures in three clothing ensembles HV, MIL and FIRE were also outside the expected limits. Thus, there is a need for further extension for the clothing insulation validation range of the PHS model. It is recommended that the PHS model should be amended and validated by individual algorithms, physical or physiological parameters, and further subject studies.},
  author       = {Wang, Faming and Kuklane, Kalev and Gao, Chuansi and Holmér, Ingvar},
  issn         = {0967-3334},
  keyword      = {PHS model,heat stress,thermoregulatory modeling,protective clothing,hot environment},
  language     = {eng},
  number       = {2},
  pages        = {239--249},
  publisher    = {IOP Publishing},
  series       = {Physiological Measurement},
  title        = {Can the PHS model (ISO7933) predict reasonable thermophysiological responses while wearing protective clothing in hot environments?},
  url          = {http://dx.doi.org/10.1088/0967-3334/32/2/007},
  volume       = {32},
  year         = {2011},
}