Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance

Post-exercise rehydration has been widely studied, with particular emphasis on retention of ingested fluid; comparatively little research has been conducted on why we drink more or less. To identify physiological values corresponding to voluntary drinking cessation (VDC), nine males exercised interm...

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Main Authors: Catalina Capitán-Jiménez, Luis Fernando Aragón-Vargas
Format: Article
Language:English
Published: MDPI AG 2022-10-01
Series:Nutrients
Subjects:
Online Access:https://www.mdpi.com/2072-6643/14/19/4188
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author Catalina Capitán-Jiménez
Luis Fernando Aragón-Vargas
author_facet Catalina Capitán-Jiménez
Luis Fernando Aragón-Vargas
author_sort Catalina Capitán-Jiménez
collection DOAJ
description Post-exercise rehydration has been widely studied, with particular emphasis on retention of ingested fluid; comparatively little research has been conducted on why we drink more or less. To identify physiological values corresponding to voluntary drinking cessation (VDC), nine males exercised intermittently at 70–80% HRmax in the heat (WBGT = 28.1 ± 0.7 °C) to achieve a dehydration of approximately 4.0% body mass (BM). After exercise, participants were instructed to drink water as long and as much as they needed. Urine color (U<sub>color</sub>), specific gravity (USG), osmolality (U<sub>osm</sub>), plasma osmolality (P<sub>osm</sub>), fullness, BM, and thirst perception (TP) were measured pre- and post-exercise and at VDC. Each variable was compared for the three points in time with a one-way ANOVA. Participants reached dehydration of −3.6 ± 0.3% BM. Pre-exercise USG (1.022 ± 0.004) was lower than at VDC (1.029 ± 0.004, <i>p</i> = 0.022), U<sub>osm</sub> did not change over time (<i>p</i> = 0.217), and U<sub>color</sub> was lower pre-exercise (3.4 ± 0.7) vs. post-exercise (5.5 ± 1.23, <i>p</i> = 0.0008) and vs. VDC (6.3 ± 1.1, <i>p</i> < 0.0001). P<sub>osm</sub> showed a difference between pre-exercise (289.5 ± 2.3) and post-exercise (297.8 ± 3.9, <i>p</i> = 0.0006) and between post-exercise and VDC (287.3 ± 5.4, <i>p</i> < 0.0001). TP post-exercise (96.4 ± 4.34) was significantly higher than pre-exercise (36.2 ± 19.1) and VDC (25.0 ± 18.2, <i>p</i> < 0.0001). At VDC, participants had recovered 58.7 ± 12.1% of BM loss. At the point of voluntary drinking cessation, P<sub>osm</sub> and thirst perception had returned to their pre-exercise values, while rehydration relative to initial BM was still incomplete.
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spelling doaj.art-1f90057bb056403787209f0c0e6089cc2023-11-23T21:27:06ZengMDPI AGNutrients2072-66432022-10-011419418810.3390/nu14194188Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid BalanceCatalina Capitán-Jiménez0Luis Fernando Aragón-Vargas1Department of Nutrition, Universidad Hispanoamericana, San Jose 10101, Costa RicaHuman Movement Science Research Center, Universidad de Costa Rica, San Pedro 11501, Costa RicaPost-exercise rehydration has been widely studied, with particular emphasis on retention of ingested fluid; comparatively little research has been conducted on why we drink more or less. To identify physiological values corresponding to voluntary drinking cessation (VDC), nine males exercised intermittently at 70–80% HRmax in the heat (WBGT = 28.1 ± 0.7 °C) to achieve a dehydration of approximately 4.0% body mass (BM). After exercise, participants were instructed to drink water as long and as much as they needed. Urine color (U<sub>color</sub>), specific gravity (USG), osmolality (U<sub>osm</sub>), plasma osmolality (P<sub>osm</sub>), fullness, BM, and thirst perception (TP) were measured pre- and post-exercise and at VDC. Each variable was compared for the three points in time with a one-way ANOVA. Participants reached dehydration of −3.6 ± 0.3% BM. Pre-exercise USG (1.022 ± 0.004) was lower than at VDC (1.029 ± 0.004, <i>p</i> = 0.022), U<sub>osm</sub> did not change over time (<i>p</i> = 0.217), and U<sub>color</sub> was lower pre-exercise (3.4 ± 0.7) vs. post-exercise (5.5 ± 1.23, <i>p</i> = 0.0008) and vs. VDC (6.3 ± 1.1, <i>p</i> < 0.0001). P<sub>osm</sub> showed a difference between pre-exercise (289.5 ± 2.3) and post-exercise (297.8 ± 3.9, <i>p</i> = 0.0006) and between post-exercise and VDC (287.3 ± 5.4, <i>p</i> < 0.0001). TP post-exercise (96.4 ± 4.34) was significantly higher than pre-exercise (36.2 ± 19.1) and VDC (25.0 ± 18.2, <i>p</i> < 0.0001). At VDC, participants had recovered 58.7 ± 12.1% of BM loss. At the point of voluntary drinking cessation, P<sub>osm</sub> and thirst perception had returned to their pre-exercise values, while rehydration relative to initial BM was still incomplete.https://www.mdpi.com/2072-6643/14/19/4188thirst perceptiondehydrationrehydrationvoluntary fluid intakeurine osmolality
spellingShingle Catalina Capitán-Jiménez
Luis Fernando Aragón-Vargas
Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance
Nutrients
thirst perception
dehydration
rehydration
voluntary fluid intake
urine osmolality
title Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance
title_full Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance
title_fullStr Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance
title_full_unstemmed Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance
title_short Post-Exercise Voluntary Drinking Cessation Is Associated with the Normalization of Plasma Osmolality and Thirst Perception, but Not of Urine Indicators or Net Fluid Balance
title_sort post exercise voluntary drinking cessation is associated with the normalization of plasma osmolality and thirst perception but not of urine indicators or net fluid balance
topic thirst perception
dehydration
rehydration
voluntary fluid intake
urine osmolality
url https://www.mdpi.com/2072-6643/14/19/4188
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