气候变化领域集成服务门户(CCPortal): Evaluating the 35°C wet-bulb temperature adaptability threshold for young, healthy subjects (PSU HEAT Project)

CCPortal

DOI	10.1152/japplphysiol.00738.2021
	Evaluating the 35°C wet-bulb temperature adaptability threshold for young, healthy subjects (PSU HEAT Project)
	Vecellio, Daniel J.; Wolf, S. Tony; Cottle, Rachel M.; Kenney, W. Larry
发表日期	2022
ISSN	8750-7587
EISSN	1522-1601
起始页码	340
结束页码	345
卷号	132 期号:2
英文摘要	A wet-bulb temperature of 35 degrees C has been theorized to be the limit to human adaptability to extreme heat, a growing concern in the face of continued and predicted accelerated climate change. Although this theorized threshold is based in physiological principles, it has not been tested using empirical data. This study examined the critical wet-bulb temperature (T-wb,(crit)) at which heat stress becomes uncompensable in young, healthy adults performing tasks at modest metabolic rates mimicking basic activities of daily life. Across six experimentally determined environmental limits, no subject's T-wb,(crit) reached the 35 degrees C limit and all means were significantly lower than the theoretical 35 degrees C threshold. Mean T-wb,(crit) values were relatively constant across 36 degrees C -40 degrees C humid environments and averaged 30.55 +/- 0.98 degrees C but progressively decreased (higher deviation from 35 degrees C) in hotter, dry ambient environments. T-wb,(crit) was significantly associated with mean skin temperature (and a faster warming rate of the skin) due to larger increases in dry heat gain in the hot-dry environments. As sweat rates did not significantly differ among experimental environments, evaporative cooling was outpaced by dry heat gain in hot-dry conditions, causing larger deviations from the theoretical 35 degrees C adaptability threshold. In summary, a wet-bulb temperature threshold cannot be applied to human adaptability across all climatic conditions and where appropriate (high humidity), that threshold is well below 35 degrees C. NEW & NOTEWORTHY This study is the first to use empirical physiological observations to examine the well-publicized theoretical 35 degrees C wet-bulb temperature limit for human to extreme environments. We find that uncompensable heat stress in humid environments occurs in young, healthy adults at wet-bulb temperatures significantly lower than 35 degrees C. In addition, uncompensable heat stress occurs at widely different wet-bulb temperatures as a function of ambient vapor pressure.
英文关键词	climate change; environmental limits; global warming; human heat stress; thermoregulation
语种	英语
WOS研究方向	Physiology ; Sport Sciences
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000749001300003
来源期刊	JOURNAL OF APPLIED PHYSIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280765
作者单位	Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park
推荐引用方式 GB/T 7714	Vecellio, Daniel J.,Wolf, S. Tony,Cottle, Rachel M.,et al. Evaluating the 35°C wet-bulb temperature adaptability threshold for young, healthy subjects (PSU HEAT Project)[J],2022,132(2).
APA	Vecellio, Daniel J.,Wolf, S. Tony,Cottle, Rachel M.,&Kenney, W. Larry.(2022).Evaluating the 35°C wet-bulb temperature adaptability threshold for young, healthy subjects (PSU HEAT Project).JOURNAL OF APPLIED PHYSIOLOGY,132(2).
MLA	Vecellio, Daniel J.,et al."Evaluating the 35°C wet-bulb temperature adaptability threshold for young, healthy subjects (PSU HEAT Project)".JOURNAL OF APPLIED PHYSIOLOGY 132.2(2022).