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Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function
Introduction/Purpose: This study examined the influence of acute dehydration on neuromuscular function. Methods: On separate days, combat sports athletes experienced in acute dehydration practices (n = 14) completed a 3 h passive heating intervention (40°C, 63% relative humidity) to induce dehydrati...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6224374/ https://www.ncbi.nlm.nih.gov/pubmed/30450056 http://dx.doi.org/10.3389/fphys.2018.01562 |
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author | Barley, Oliver R. Chapman, Dale W. Blazevich, Anthony J. Abbiss, Chris R. |
author_facet | Barley, Oliver R. Chapman, Dale W. Blazevich, Anthony J. Abbiss, Chris R. |
author_sort | Barley, Oliver R. |
collection | PubMed |
description | Introduction/Purpose: This study examined the influence of acute dehydration on neuromuscular function. Methods: On separate days, combat sports athletes experienced in acute dehydration practices (n = 14) completed a 3 h passive heating intervention (40°C, 63% relative humidity) to induce dehydration (DHY) or a thermoneutral euhydration control (25°C, 50% relative humidity: CON). In the ensuing 3 h ad libitum fluid and food intake was allowed, after which participants performed fatiguing exercise consisting of repeated unilateral knee extensions at 85% of their maximal voluntary isometric contraction (MVIC) torque until task failure. Both before and after the fatiguing protocol participants performed six MVICs during which measures of central and peripheral neuromuscular function were made. Urine and whole blood samples to assess urine specific gravity, urine osmolality, haematocrit and serum osmolality were collected before, immediately and 3 h after intervention. Results: Body mass was reduced by 3.2 ± 1.1% immediately after DHY (P < 0.001) but recovered by 3 h. Urine and whole blood markers indicated dehydration immediately after DHY, although blood markers were not different to CON at 3 h. Participants completed 28% fewer knee extensions at 85% MVIC (P < 0.001, g = 0.775) and reported a greater perception of fatigue (P = 0.012) 3 h after DHY than CON despite peak torque results being unaffected. No between-condition differences were observed in central or peripheral indicators of neuromuscular function at any timepoint. Conclusion: Results indicate that acute dehydration of 3.2% body mass followed by 3 h of recovery impairs muscular strength-endurance and increases fatigue perception without changes in markers of central or peripheral function. These findings suggest that altered fatigue perception underpins muscular performance decrements in recovery from acute dehydration. |
format | Online Article Text |
id | pubmed-6224374 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-62243742018-11-16 Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function Barley, Oliver R. Chapman, Dale W. Blazevich, Anthony J. Abbiss, Chris R. Front Physiol Physiology Introduction/Purpose: This study examined the influence of acute dehydration on neuromuscular function. Methods: On separate days, combat sports athletes experienced in acute dehydration practices (n = 14) completed a 3 h passive heating intervention (40°C, 63% relative humidity) to induce dehydration (DHY) or a thermoneutral euhydration control (25°C, 50% relative humidity: CON). In the ensuing 3 h ad libitum fluid and food intake was allowed, after which participants performed fatiguing exercise consisting of repeated unilateral knee extensions at 85% of their maximal voluntary isometric contraction (MVIC) torque until task failure. Both before and after the fatiguing protocol participants performed six MVICs during which measures of central and peripheral neuromuscular function were made. Urine and whole blood samples to assess urine specific gravity, urine osmolality, haematocrit and serum osmolality were collected before, immediately and 3 h after intervention. Results: Body mass was reduced by 3.2 ± 1.1% immediately after DHY (P < 0.001) but recovered by 3 h. Urine and whole blood markers indicated dehydration immediately after DHY, although blood markers were not different to CON at 3 h. Participants completed 28% fewer knee extensions at 85% MVIC (P < 0.001, g = 0.775) and reported a greater perception of fatigue (P = 0.012) 3 h after DHY than CON despite peak torque results being unaffected. No between-condition differences were observed in central or peripheral indicators of neuromuscular function at any timepoint. Conclusion: Results indicate that acute dehydration of 3.2% body mass followed by 3 h of recovery impairs muscular strength-endurance and increases fatigue perception without changes in markers of central or peripheral function. These findings suggest that altered fatigue perception underpins muscular performance decrements in recovery from acute dehydration. Frontiers Media S.A. 2018-11-02 /pmc/articles/PMC6224374/ /pubmed/30450056 http://dx.doi.org/10.3389/fphys.2018.01562 Text en Copyright © 2018 Barley, Chapman, Blazevich and Abbiss. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Physiology Barley, Oliver R. Chapman, Dale W. Blazevich, Anthony J. Abbiss, Chris R. Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function |
title | Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function |
title_full | Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function |
title_fullStr | Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function |
title_full_unstemmed | Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function |
title_short | Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function |
title_sort | acute dehydration impairs endurance without modulating neuromuscular function |
topic | Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6224374/ https://www.ncbi.nlm.nih.gov/pubmed/30450056 http://dx.doi.org/10.3389/fphys.2018.01562 |
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