Funded in part by American College of Sports Medicine, Gatorade Sports Science Institute
Hypohydration Decreases Neuromuscular Performance before and after Intermittent Exercise in the Heat
Elliott KB, Keefe MS, Dunn RA, Palmer TB, Lepley AS, Sekiguchi Y
Medicine and science in sports and exercise · 0 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Industry funded
- Company
- American College of Sports Medicine, Gatorade Sports Science Institute
Based on 1 listed funder(s).
Publication
- Published
- 2026-01-22 · Med Sci Sports Exerc · vol. 58 · issue 6 · pp. 1259–1274
- Publisher
- Lippincott Williams & Wilkins
- Cited
- 0 citations · more than 5% of similar papers · 0.0× the field average
- References
- 93 works
- Access
- Paywalled
- Research areas
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Cardiovascular and exercise physiology
- Keywords
- Supine position, Physical exercise, Electromyography, Work (physics), Endurance training
- MeSH
- muscle, skeletal, humans, dehydration, exercise, oxygen consumption, torque, soccer, male, hot temperature, young adult, organism hydration status
6 authors
From US
- Kelly B. ElliottTexas Tech University
- Marcos S. KeefeTexas Tech University
- R. Patrice DunnTexas Tech University
- Ty B. PALMERTexas Tech University
- Adam S. LepleyUniversity of Michigan
- Yasuki Sekiguchi · correspondingTexas Tech University
Abstract
Purpose
To examine the effect of hydration status on neuromuscular performance before and after intermittent exercise in the heat.
Methods
Eleven male soccer players (age, 20 ± 2 years; height, 179.0 ± 7.9 cm; body mass, 74.9 ± 10.3 kg; maximal oxygen consumption, 62.4 ± 11.5 mL·kg -1 ·min -1 ) performed a familiarization trial involving ultrasound (cross-sectional area and muscle thickness), landing error scoring system, and isometric knee extensions (rate of torque development [RTD]; time intervals of 0-30 ms [RTD 30], 0-50 ms [RTD 50], 0-100 ms [RTD 100], and 0-200 ms [RTD 200] from contraction onset). After this, participants completed 45-min of intermittent exercise in the heat (33ºC, 30% relative humidity) as part of familiarization. Experimental trials replicated the same protocol of pre and post neuromuscular testing separated by two 45-minute intermittent exercise bouts in the heat. Two experimental trials (euhydrated [EUH] and hypohydrated [HYP]) were randomly assigned; EUH maintained euhydration throughout the trial; HYP performed a 24-h fluid restriction before the trial. Before and after exercise, urine specific gravity, urine osmolality, and body mass loss were measured. A linear mixed effect model with Tukey post hoc was utilized to assess differences between trials.
Results
Cross-sectional area of the rectus femoris was smaller in HYP pre (13.3 ± 2.4 cm 2 ) compared with EUH pre (14.0 ± 2.6 cm 2 ), and in HYP post (12.7 ± 2.4 cm 2 ) compared with EUH post (14.0 ± 2.6 cm 2 ) ( P < 0.05). Independent of time, muscle thickness was also smaller in HYP (2.27 ± 0.2 cm) compared with EUH (2.45 ± 0.2 cm, P < 0.05). Furthermore, landing error scoring system scores were higher in HYP (4.1 ± 2.0) compared with EUH (2.9 ± 2.0, P < 0.05). RTD 30, 50, and 100 were all lower in HYP (326 ± 138 Nm·s -1 ; 441 ± 207 Nm·s -1 ; 648 ± 302 Nm·s -1 ) compared with EUH (427 ± 175 Nm·s -1 ; 584 ± 282 Nm·s -1 ; 796 ± 392 Nm·s -1 , P < 0.05), respectively. Additionally, urine specific gravity, urine osmolality, and body mass loss were all higher in HYP compared with EUH (P < 0.05).
Conclusions
Hypohydration can negatively impact neuromuscular performance before and after intermittent exercise in the heat.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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