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Thermal Behavior Augments Heat Loss Following Low Intensity Exercise

We tested the hypothesis that thermal behavior alleviates thermal discomfort and accelerates core temperature recovery following low intensity exercise. Methods: In a 27 ± 0 °C, 48 ± 6% relative humidity environment, 12 healthy subjects (six females) completed 60 min of exercise followed by 90 min o...

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Autores principales: Vargas, Nicole T., Chapman, Christopher L., Johnson, Blair D., Gathercole, Rob, Cramer, Matthew N., Schlader, Zachary J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981425/
https://www.ncbi.nlm.nih.gov/pubmed/31861405
http://dx.doi.org/10.3390/ijerph17010020
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author Vargas, Nicole T.
Chapman, Christopher L.
Johnson, Blair D.
Gathercole, Rob
Cramer, Matthew N.
Schlader, Zachary J.
author_facet Vargas, Nicole T.
Chapman, Christopher L.
Johnson, Blair D.
Gathercole, Rob
Cramer, Matthew N.
Schlader, Zachary J.
author_sort Vargas, Nicole T.
collection PubMed
description We tested the hypothesis that thermal behavior alleviates thermal discomfort and accelerates core temperature recovery following low intensity exercise. Methods: In a 27 ± 0 °C, 48 ± 6% relative humidity environment, 12 healthy subjects (six females) completed 60 min of exercise followed by 90 min of seated recovery on two occasions. Subjects wore a suit top perfusing 34 ± 0 °C water during exercise. In the control trial, this water continually perfused throughout recovery. In the behavior trial, the upper body was maintained thermally comfortable by pressing a button to receive cool water (3 ± 2 °C) perfusing through the top for 2 min per button press. Results: Physiological variables (core temperature, p ≥ 0.18; mean skin temperature, p = 0.99; skin wettedness, p ≥ 0.09; forearm skin blood flow, p = 0.29 and local axilla sweat rate, p = 0.99) did not differ between trials during exercise. Following exercise, mean skin temperature decreased in the behavior trial in the first 10 min (by −0.5 ± 0.7 °C, p < 0.01) and upper body skin temperature was reduced until 70 min into recovery (by 1.8 ± 1.4 °C, p < 0.05). Core temperature recovered to pre-exercise levels 17 ± 31 min faster (p = 0.02) in the behavior trial. There were no differences in skin blood flow or local sweat rate between conditions during recovery (p ≥ 0.05). Whole-body thermal discomfort was reduced (by −0.4 ± 0.5 a.u.) in the behavior trial compared to the control trial within the first 20 min of recovery (p ≤ 0.02). Thermal behavior via upper body cooling resulted in augmented cumulative heat loss within the first 30 min of recovery (Behavior: 288 ± 92 kJ; Control: 160 ± 44 kJ, p = 0.02). Conclusions: Engaging in thermal behavior that results in large reductions in mean skin temperature following exercise accelerates the recovery of core temperature and alleviates thermal discomfort by promoting heat loss.
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spelling pubmed-69814252020-02-07 Thermal Behavior Augments Heat Loss Following Low Intensity Exercise Vargas, Nicole T. Chapman, Christopher L. Johnson, Blair D. Gathercole, Rob Cramer, Matthew N. Schlader, Zachary J. Int J Environ Res Public Health Article We tested the hypothesis that thermal behavior alleviates thermal discomfort and accelerates core temperature recovery following low intensity exercise. Methods: In a 27 ± 0 °C, 48 ± 6% relative humidity environment, 12 healthy subjects (six females) completed 60 min of exercise followed by 90 min of seated recovery on two occasions. Subjects wore a suit top perfusing 34 ± 0 °C water during exercise. In the control trial, this water continually perfused throughout recovery. In the behavior trial, the upper body was maintained thermally comfortable by pressing a button to receive cool water (3 ± 2 °C) perfusing through the top for 2 min per button press. Results: Physiological variables (core temperature, p ≥ 0.18; mean skin temperature, p = 0.99; skin wettedness, p ≥ 0.09; forearm skin blood flow, p = 0.29 and local axilla sweat rate, p = 0.99) did not differ between trials during exercise. Following exercise, mean skin temperature decreased in the behavior trial in the first 10 min (by −0.5 ± 0.7 °C, p < 0.01) and upper body skin temperature was reduced until 70 min into recovery (by 1.8 ± 1.4 °C, p < 0.05). Core temperature recovered to pre-exercise levels 17 ± 31 min faster (p = 0.02) in the behavior trial. There were no differences in skin blood flow or local sweat rate between conditions during recovery (p ≥ 0.05). Whole-body thermal discomfort was reduced (by −0.4 ± 0.5 a.u.) in the behavior trial compared to the control trial within the first 20 min of recovery (p ≤ 0.02). Thermal behavior via upper body cooling resulted in augmented cumulative heat loss within the first 30 min of recovery (Behavior: 288 ± 92 kJ; Control: 160 ± 44 kJ, p = 0.02). Conclusions: Engaging in thermal behavior that results in large reductions in mean skin temperature following exercise accelerates the recovery of core temperature and alleviates thermal discomfort by promoting heat loss. MDPI 2019-12-18 2020-01 /pmc/articles/PMC6981425/ /pubmed/31861405 http://dx.doi.org/10.3390/ijerph17010020 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Vargas, Nicole T.
Chapman, Christopher L.
Johnson, Blair D.
Gathercole, Rob
Cramer, Matthew N.
Schlader, Zachary J.
Thermal Behavior Augments Heat Loss Following Low Intensity Exercise
title Thermal Behavior Augments Heat Loss Following Low Intensity Exercise
title_full Thermal Behavior Augments Heat Loss Following Low Intensity Exercise
title_fullStr Thermal Behavior Augments Heat Loss Following Low Intensity Exercise
title_full_unstemmed Thermal Behavior Augments Heat Loss Following Low Intensity Exercise
title_short Thermal Behavior Augments Heat Loss Following Low Intensity Exercise
title_sort thermal behavior augments heat loss following low intensity exercise
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981425/
https://www.ncbi.nlm.nih.gov/pubmed/31861405
http://dx.doi.org/10.3390/ijerph17010020
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