NDLI: The evaporative requirement for heat balance determines whole-body sweat rate during exercise under conditions permitting full evaporation

Content Provider	PubMed Central
Author	Gagnon, Daniel Jay, Ollie Kenny, Glen P.
Copyright Year	2013
Abstract	Although the requirements for heat dissipation during exercise are determined by the necessity for heat balance, few studies have considered them when examining sweat production and its potential modulators. Rather, the majority of studies have used an experimental protocol based on a fixed percentage of maximum oxygen uptake (% ). Using multiple regression analysis, we examined the independent contribution of the evaporative requirement for heat balance (E req) and % to whole-body sweat rate (WBSR) during exercise. We hypothesised that WBSR would be determined by E req and not by % . A total of 23 males performed two separate experiments during which they exercised for 90 min at different rates of metabolic heat production (200, 350, 500 W) at a fixed air temperature (30°C, n= 8), or at a fixed rate of metabolic heat production (290 W) at different air temperatures (30, 35, 40°C, n= 15 and 45°C, n= 7). Whole-body evaporative heat loss was measured by direct calorimetry and used to calculate absolute WBSR in grams per minute. The conditions employed resulted in a wide range of E req (131–487 W) and % (15–55%). The individual variation in non-steady-state (0–30 min) and steady-state (30–90 min) WBSR correlated significantly with E req (P < 0.001). In contrast, % correlated negatively with the residual variation in WBSR not explained by E req, and marginally increased (∼2%) the amount of total variability in WBSR described by E req alone (non-steady state: R 2= 0.885; steady state: R 2= 0.930). These data provide clear evidence that absolute WBSR during exercise is determined by E req, not by % . Future studies should therefore use an experimental protocol which ensures a fixed E req when examining absolute WBSR between individuals, irrespective of potential differences in relative exercise intensity.
Related Links	http://dx.doi.org/10.1113/jphysiol.2012.248823
Ending Page	2935
Page Count	11
Starting Page	2925
File Format	PDF
ISSN	00223751
e-ISSN	14697793
Journal	The Journal of Physiology
Issue Number	Pt 11
Volume Number	591
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2013-06-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Sports Science

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