NDLI: Effect of Hypohydration on Thermoregulatory Responses in Males with Low and High Body Fat Exercising in the Heat.

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Effect of Hypohydration on Thermoregulatory Responses in Males with Low and High Body Fat Exercising in the Heat.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tucker, Matthew A. Caldwell, Aaron R. Butts, Cory L. Robinson, Forrest B. Reynebeau, Haley C. Kavouras, Stavros A. McDermott, Brendon P. Washington, Tyrone Anthony Turner, Ronna C. Ganio, Matthew S.
Description	Author Affiliation: Tucker MA ( University of Arkansas.); Caldwell AR ( University of Arkansas.); Butts CL ( University of Arkansas.); Robinson FB ( University of Arkansas.); Reynebeau HC ( University of Arkansas.); Kavouras SA ( University of Arkansas.); McDermott BP ( University of Arkansas.); Washington TA ( University of Arkansas.); Turner RC ( University of Arkansas.); Ganio MS ( University of Arkansas msganio@uark.edu.)
Abstract	It is unclear if males with low body fat (LO-BF) have impaired thermoregulation during exercise heat stress compared to those with high body fat (HI-BF) when euhydration (EU) is maintained. Further, in LO-BF individuals, hypohydration (HY) impairs thermoregulatory responses during exercise heat stress, but it is unknown if this occurs in HI-BF counterparts. PURPOSE: To test the hypotheses that males with HI-BF have impaired thermoregulatory responses to exercise heat-stress, and HY further exacerbates these impairments versus LO-BF. METHODS: Males with LO-BF (n=11, body mass [BM] 73.9±8.5 kg, BF% 13.6±3.8) and HI-BF (n=9, BM 89.6±6.9 kg, BF% 30.2±4.1), in a randomized cross-over design, performed 60 min of upright cycling in a hot environment (40.3±0.4°C, relative humidity 32.5±1.9%) at a metabolic heat production rate of 6 W·kg BM and finished exercise either euhydrated (EU; 0.3±1.2 vs. 0.3±0.9% BM loss, respectively) or HY (-2.5±1.1 vs. -1.7±1.5% BM loss). Change in rectal temperature (∆T ), local sweat rate (∆LSR), and cutaneous vascular conductance (∆CVC; % ) were measured throughout. RESULTS: When EU, LO-BF and HI-BF had similar CVC and LSR responses (P>0.05); however, LO-BF had a lower ∆T versus HI-BF (0.92±0.35 vs. 1.31±0.32°C, P=0.021). Compared to EU, HY increased end-exercise ∆T in LO-BF (0.47±0.37°C, P<0.01) but not in HI-BF (-0.06±0.29°C, P>0.05). Hypohydration, compared to EU, did not affect ∆LSR and ∆CVC in either group (P>0.05). CONCLUSIONS: When euhydrated, males with HI-BF have a greater increase in T versus LO-BF, but similar CVC and LSR. Hypohydration exacerbates increases in T in LO-BF but not HI-BF.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Language	English
Publisher	American Physiological Society
Publisher Date	2016-10-27
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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