NDLI: Thermoregulatory responses to exercise at a fixed rate of heat production are not altered by acute hypoxia.

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Year: 2017 Volume: 122

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Thermoregulatory responses to exercise at a fixed rate of heat production are not altered by acute hypoxia.

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Thermoregulatory responses to exercise at a fixed rate of heat production are not altered by acute hypoxia.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Coombs, Geoff B. Cramer, Matthew N. Ravanelli, Nicholas Imbeault, Pascal Jay, Ollie
Description	Author Affiliation: Coombs GB ( University of Ottawa.); Cramer MN ( Institute for Exercise and Environmental Medicine.); Ravanelli N ( University of Sydney.); Imbeault P ( University of Ottawa.); Jay O ( University of Sydney Ollie.jay@sydney.edu.au.)
Abstract	This study sought to assess the within-subject influence of acute hypoxia on exercise-induced changes in core temperature and sweating. Eight participants [1.75 (0.06) m, 70.2 (6.8) kg, 25 (4) y, 54 (8) mL kg min ] completed 45 min of cycling, once in normoxia (NORM; FiO =0.21) and twice in hypoxia (HYP1/HYP2; FiO =0.13) at 34.4(0.2)°C, 46(3)% RH. These trials were designed to elicit a) two distinctly different %VO [NORM:45(8)% and HYP1:62(7)%] at the same heat production (H ) [NORM:6.7(0.6) W kg and HYP1:7.0(0.5) W kg ]; and b) the same %VO [NORM:45(8)% and HYP2:48(5)%] with different H [NORM:6.7(0.6) W kg and HYP2:5.5(0.6) W kg ]. At a fixed %VO , changes in rectal temperature (∆T ) and changes in esophageal temperature (∆T ) were greater at end-exercise in NORM [∆T :0.76(0.19)°C; ∆T :0.64(0.22)°C] compared to HYP2 [∆T :0.56(0.22)°C, P<0.01; ∆T :0.50(0.30)°C, P<0.01]. As a result of a greater H (P<0.01) in normoxia, and therefore evaporative heat balance requirements, in order to maintain a similar %VO compared to hypoxia, mean local sweat rates (LSR) from the forearm, upper back, and forehead were greater (all P<0.01) in NORM [1.10(0.20) mg cm min ] compared to HYP2 [0.71(0.19) mg cm min ]. However, at a fixed H , ∆T [0.75(0.24)°C; P=0.77] and ∆Tes [0.63(0.29)°C; P=0.69] were not different in HYP1, compared to NORM. Likewise, mean LSR [1.11(0.20) mg cm min ] was not different (P=0.84) in HYP1 compared to NORM. These data demonstrate, using a within-subjects design, that hypoxia does not independently influence thermoregulatory responses. Additionally, further evidence is provided to support that metabolic heat production, irrespective of %VO , determines changes in core temperature and sweating during exercise.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Language	English
Publisher	American Physiological Society
Publisher Date	2017-03-16
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Applied Physiology Molecular Biology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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