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Inputs to Thirst and Drinking during Water Restriction and Rehydration

Current models of afferent inputs to the brain, which influence body water volume and concentration via thirst and drinking behavior, have not adequately described the interactions of subconscious homeostatic regulatory responses with conscious perceptions. The purpose of this investigation was to o...

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Autores principales: Armstrong, Lawrence E., Giersch, Gabrielle E. W., Dunn, Leslie, Fiol, Aidan, Muñoz, Colleen X., Lee, Elaine C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7551505/
https://www.ncbi.nlm.nih.gov/pubmed/32846895
http://dx.doi.org/10.3390/nu12092554
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author Armstrong, Lawrence E.
Giersch, Gabrielle E. W.
Dunn, Leslie
Fiol, Aidan
Muñoz, Colleen X.
Lee, Elaine C.
author_facet Armstrong, Lawrence E.
Giersch, Gabrielle E. W.
Dunn, Leslie
Fiol, Aidan
Muñoz, Colleen X.
Lee, Elaine C.
author_sort Armstrong, Lawrence E.
collection PubMed
description Current models of afferent inputs to the brain, which influence body water volume and concentration via thirst and drinking behavior, have not adequately described the interactions of subconscious homeostatic regulatory responses with conscious perceptions. The purpose of this investigation was to observe the interactions of hydration change indices (i.e., plasma osmolality, body mass loss) with perceptual ratings (i.e., thirst, mouth dryness, stomach emptiness) in 18 free-living, healthy adult men (age, 23 ± 3 y; body mass, 80.09 ± 9.69 kg) who participated in a 24-h water restriction period (Days 1–2), a monitored 30-min oral rehydration session (REHY, Day 2), and a 24-h ad libitum rehydration period (Days 2–3) while conducting usual daily activities. Laboratory and field measurements spanned three mornings and included subjective perceptions (visual analog scale ratings, VAS), water intake, dietary intake, and hydration biomarkers associated with dehydration and rehydration. Results indicated that total water intake was 0.31 L/24 h on Day 1 versus 2.60 L/24 h on Day 2 (of which 1.46 L/30 min was consumed during REHY). The increase of plasma osmolality on Day 1 (297 ± 4 to 299 ± 5 mOsm/kg) concurrent with a body mass loss of 1.67 kg (2.12%) paralleled increasing VAS ratings of thirst, desire for water, and mouth dryness but not stomach emptiness. Interestingly, plasma osmolality dissociated from all perceptual ratings on Day 3, suggesting that morning thirst was predominantly non-osmotic (i.e., perceptual). These findings clarified the complex, dynamic interactions of subconscious regulatory responses with conscious perceptions during dehydration, rehydration, and reestablished euhydration.
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spelling pubmed-75515052020-10-14 Inputs to Thirst and Drinking during Water Restriction and Rehydration Armstrong, Lawrence E. Giersch, Gabrielle E. W. Dunn, Leslie Fiol, Aidan Muñoz, Colleen X. Lee, Elaine C. Nutrients Article Current models of afferent inputs to the brain, which influence body water volume and concentration via thirst and drinking behavior, have not adequately described the interactions of subconscious homeostatic regulatory responses with conscious perceptions. The purpose of this investigation was to observe the interactions of hydration change indices (i.e., plasma osmolality, body mass loss) with perceptual ratings (i.e., thirst, mouth dryness, stomach emptiness) in 18 free-living, healthy adult men (age, 23 ± 3 y; body mass, 80.09 ± 9.69 kg) who participated in a 24-h water restriction period (Days 1–2), a monitored 30-min oral rehydration session (REHY, Day 2), and a 24-h ad libitum rehydration period (Days 2–3) while conducting usual daily activities. Laboratory and field measurements spanned three mornings and included subjective perceptions (visual analog scale ratings, VAS), water intake, dietary intake, and hydration biomarkers associated with dehydration and rehydration. Results indicated that total water intake was 0.31 L/24 h on Day 1 versus 2.60 L/24 h on Day 2 (of which 1.46 L/30 min was consumed during REHY). The increase of plasma osmolality on Day 1 (297 ± 4 to 299 ± 5 mOsm/kg) concurrent with a body mass loss of 1.67 kg (2.12%) paralleled increasing VAS ratings of thirst, desire for water, and mouth dryness but not stomach emptiness. Interestingly, plasma osmolality dissociated from all perceptual ratings on Day 3, suggesting that morning thirst was predominantly non-osmotic (i.e., perceptual). These findings clarified the complex, dynamic interactions of subconscious regulatory responses with conscious perceptions during dehydration, rehydration, and reestablished euhydration. MDPI 2020-08-24 /pmc/articles/PMC7551505/ /pubmed/32846895 http://dx.doi.org/10.3390/nu12092554 Text en © 2020 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
Armstrong, Lawrence E.
Giersch, Gabrielle E. W.
Dunn, Leslie
Fiol, Aidan
Muñoz, Colleen X.
Lee, Elaine C.
Inputs to Thirst and Drinking during Water Restriction and Rehydration
title Inputs to Thirst and Drinking during Water Restriction and Rehydration
title_full Inputs to Thirst and Drinking during Water Restriction and Rehydration
title_fullStr Inputs to Thirst and Drinking during Water Restriction and Rehydration
title_full_unstemmed Inputs to Thirst and Drinking during Water Restriction and Rehydration
title_short Inputs to Thirst and Drinking during Water Restriction and Rehydration
title_sort inputs to thirst and drinking during water restriction and rehydration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7551505/
https://www.ncbi.nlm.nih.gov/pubmed/32846895
http://dx.doi.org/10.3390/nu12092554
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