Effects of sweating on distal skin temperature prediction during walking
© Veselá et al.; 2015
Published: 14 September 2015
Thermal sensation models require a high quality prediction of local skin temperatures (Tskin,X) from thermoregulation models. However, most thermoregulation models are validated for Tskin,mean under laboratory setting. The objective of this study is to investigate the challenges of simulating distal skin temperatures Tskin,distal during walking.
For this study, the skin temperature (Tskin) of human subjects (4 males, 2 females) is measured at 15 sites (locations according to  plus fingertip) while walking indoors (2.8 met). The subjects wear an everyday outfit consisting of underwear, jeans, T-shirt, long-sleeved shirt, socks and shoes (0.8 clo) . The temperature is recorded every 60 seconds during a one hour experiment. The measured data is then compared to the computed Tskin,X of the mathematical thermoregulation model ThermoSEM .
Even though the exclusion of sweating leads to improved results for Tskin,foot, the main issue is the latent heat transport from the foot skin surface to the environment. The current clothing model only includes a total evaporative resistance taken from  due to the absence of studies on detailed local evaporative resistances. Therefore new experiments on local (evaporative) clothing resistances are needed.
In order to account for the reduced heat losses when wearing vapour resistant clothing (e.g. shoes), clothing models should differ between sensible and latent heat transport from the skin to the clothing and from the clothing to the environment. Furthermore, experiments are required to quantify the local evaporative resistances more accurately.
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