Mild hypohydration impairs cycle ergometry performance in the heat: A blinded study
Adams JD, Scott DM, Brand NA, Suh HG, Seal AD, McDermott BP, Ganio MS, Kavouras SA
Scandinavian journal of medicine & science in sports · 22 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
- Funding not disclosed
Publication
- Published
- 2019-01-19 · Scand J Med Sci Sports · vol. 29 · issue 5 · pp. 686–695
- Publisher
- Wiley
- Cited
- 33 citations · more than 87% of similar papers · 2.1× the field average
- References
- 29 works
- Access
- Paywalled
- Research areas
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Sports Performance and Training
- Keywords
- Cycling, Time trial, Medicine, Animal science, Cycle ergometer, Anesthesia, Internal medicine, Physical therapy, Heart rate, Blood pressure
- MeSH
- humans, dehydration, body weight, lactic acid, blood glucose, blood proteins, urinalysis, cross-over studies, ergometry, perception, sweating, specific gravity, bicycling, adult, male, athletic performance, hot temperature, young adult
8 authors
From US
- J.D. AdamsUniversity of Arkansas at Fayetteville
- Dylan ScottUniversity of Arkansas at Fayetteville
- Natasha A. BrandUniversity of Arkansas at Fayetteville
- HyunGyu SuhArizona State University
- Adam SealArizona State University; University of Arkansas at Fayetteville
- Brendon P. McDermottUniversity of Arkansas at Fayetteville
Abstract
The aim of the present study was to observe the effect of mild hypohydration on exercise performance with subjects blinded to their hydration status. Eleven male cyclists (weight 75.8 ± 6.4 kg, VO2peak : 64.9 ± 5.6 mL/kg/min, body fat: 12.0 ± 5.8%, Powermax : 409 ± 40 W) performed three sets of criterium-like cycling, consisting of 20-minute steady-state cycling (50% peak power output), each followed by a 5-km time trial at 3% grade. Following a familiarization trial, subjects completed the experimental trials, in counter-balanced fashion, on two separate occasions in dry heat (30°C, 30% rh) either hypohydrated (HYP) or euhydrated (EUH). In both trials, subjects ingested 25 mL of water every 5 minutes during the steady-state and every 1 km of the 5-km time trials. In the EUH trial, sweat losses were fully replaced via intravenous infusion of isotonic saline, while in the HYP trial, a sham IV was instrumented. Following the exercise protocol, the subjects' bodyweight was changed by -0.1 ± 0.1% and -1.8 ± 0.2% for the EUH and HYP trial, respectively (P re ) was higher in the HYP trial throughout the third steady-state and 5-km time trial (P < 0.05). These data suggest that mild hypohydration, even when subjects were unaware of their hydration state, impaired cycle ergometry performance in the heat probably due to greater thermoregulatory strain.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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