Physiological and subjective thermal responses to heat exposure in northern and southern Chinese people
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Physiological and subjective thermal responses to heat exposure in northern and southern Chinese people Research Article
Yufan Lin1, Liu Yang2 (), Maohui Luo3 () 1.College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, China 2. College of Architecture, Xi'an University of Architecture and Technology, Xi'an, China 3. School of Mechanical Engineering, Tongji University, Shanghai, China
Abstract
Keywords
When studying the thermal adaptation of building occupants, understanding the effects of different
thermal adaptation,
thermal experiences on adaptation is necessary, particularly for moderate and severe heat exposure. However, this area has seen limited research. Further, skin temperature, a common parameter for
thermal experience,
quantifying thermal sensation, may insufficiently reflect the automatic thermoregulation of the
heat exposure
human body. This study investigates the effects of long-term heat exposure on the human body using multiple physiological and subjective indexes. Two heat exposure experiments were conducted on healthy male participants from northern and southern China. Participant responses, including skin temperature, heart rate, heart rate variability, blood volume pulse (BVP), subjective thermal comfort, thermal sensation, thermal acceptability, and normalized high and low frequency values were collected and compared. The results indicated that the subjective responses of northern
physiological response,
Article History Received: 25 February 2020 Revised: 27 July 2020 Accepted: 19 August 2020 © Tsinghua University Press and
and southern participants were not significantly different; however, the subjective physiological
Springer-Verlag GmbH Germany,
symptoms and self-reported discomfort of the latter were less than those of the former, indicating that the southern participants had superior heat tolerance. Additionally, the physiological responses
part of Springer Nature 2020
of all the participants were largely similar. However, southern participants showed slightly higher normalized high frequency and BVP values, indicating that they have more active vagus nerves and better vasodilation. They also showed a wider acceptable temperature range and better acclimation to heat exposure. Notably, the mean skin temperature could not effectively predict thermal sensation during heat exposure; this was more accurately achieved using the rate of change of skin temperature. These findings suggest that long-term thermal experiences can affect building occupants’ thermal adaptability.
Introduction
Over the past two decades, thermal comfort research has moved from the steady state predicted mean vote–predicted percentage dissatisfied (PMV-PPD) comfort theory (Fanger 1970) to the adaptive comfort model (Nicol and Humphreys 1973; Brager and de Dear 1998; Humphreys and Nicol 1998). The legality of adaptive comfort models has been complied into international and regional thermal comfort standards (Nicol and Humphreys 2010; GB/T 50785-2012 2012; ASHRAE 2013). Ho
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