Mild hypohydration decreases cycling performance in the heat
Bardis CN, Kavouras SA, Kosti L, Markousi M, Sidossis LS
Medicine and science in sports and exercise · 37 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 (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Funding not disclosed
Publication
- Published
- 2013-03-07 · Med Sci Sports Exerc · vol. 45 · issue 9 · pp. 1782–1789
- Publisher
- Lippincott Williams & Wilkins
- Cited
- 48 citations · more than 87% of similar papers · 2.0× the field average
- References
- 36 works
- Access
- Paywalled
- Research areas
- Thermoregulation and physiological responses · Muscle metabolism and nutrition · Diet and metabolism studies
- Keywords
- Cycling, Animal science, Chemistry, Biology
- MeSH
- humans, dehydration, exercise test, body temperature, thirst, sweating, heart rate, bicycling, adult, male, athletic performance, physical exertion, hot temperature, young adult
5 authors
From GR, US
- Costas N. BardisHarokopio University of Athens
- Stavros Anastasios KavourasHarokopio University of Athens; University of Arkansas at Fayetteville
- LENA KOSTIHarokopio University of Athens
- MARIETTA MARKOUSIHarokopio University of Athens
- Labros S. SidossisShriners Hospitals for Children - Galveston; Harokopio University of Athens
Abstract
Introduction
Hypohydration exceeding 2% of body mass decreases exercise performance. However, the effects of mild hypohydration (<2%) are not clear.
Purpose
The aim of this study was to determine the effects of mild hypohydration on cycling performance during a simulated-hill circuit course in a warm environment (32.5°C ± 0.5°C).
Methods
Ten trained male cyclists (age, 30 ± 7 yr; mass, 78.4 ± 9.5 kg; height, 1.80 ± 0.01 m; V˙O2max, 52.4 ± 3.3 mL·min·kg; and Powermax, 355 ± 29 W) performed a cycling circuit three times on a laboratory ergometer consisting of 5 km at 50% of maximum power output and 5 km at an all-out pace, followed by a 5-min rest every 5 km. Subjects started the performance test either euhydrated (EUH) or hypohydrated (HYP), by 0% ± 0% and -1.0% ± 0.1% of body mass, respectively.
Results
Mean speed at the first, second, and third 5-km simulated-hill cycling was higher in the EUH (28.1 ± 3.1, 27.7 ± 3, and 27.0 ± 3.6 km·h) than that in the HYP trial (27.0 ± 2.9, 26.1 ± 3.7, and 25.9 ± 3.6 km·h) (P 0.05).
Conclusion
The data showed that mild hypohydration decreased cycling performance, possible by inducing greater thermal and cardiovascular strain.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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