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Mild Dehydration and Cycling Performance During 5-Kilometer Hill Climbing

Bardis, Costas N., Kavouras, Stavros A., Arnaoutis, Giannis, Panagiotakos, Demosthenes B., Sidossis, Labros S.·2013·Journal of Athletic Training
DOI 10.4085/1062-6050-48.5.01
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Abstract

Context: Hydration has been shown to be an important factor in performance; however, the effects of mild dehydration during intense cycling are not clear. Objective: To determine the influence of mild dehydration on cycling performance during an outdoor climbing trial in the heat (ambient temperature = 29.0°C ± 2.2°C). Design: Crossover study. Setting: Outdoor. Patients or Other Participants: Ten well-trained, male endurance cyclists (age = 28 ± 5 years, height = 182 ± 0.4 cm, mass = 73 ± 4 kg, maximal oxygen uptake = 56 ± 9 mL·min−1·kg−1, body fat = 23% ± 2%, maximal power = 354 ± 48 W). Intervention(s): Participants completed 1 hour of steady-state cycling with or without drinking to achieve the desired pre-exercise hydration level before 5-km hill-climbing cycling. Participants started the 5-km ride either euhydrated (EUH) or dehydrated by −1% of body mass (DEH). Main Outcome Measure(s): Performance time, core temperature, sweat rate, sweat sensitivity, and rating of perceived exertion (RPE). Results: Participants completed the 5-km ride 5.8% faster in the EUH (16.6 ± 2.3 minutes) than DEH (17.6 ± 2.9 minutes) trial (t1 = 10.221, P = .001). Postexercise body mass was −1.4% ± 0.3% for the EUH trial and −2.2% ± 0.2% for the DEH trial (t1 = 191.384, P < .001). Core temperature after the climb was greater during the DEH (39.2°C ± 0.3°C) than EUH (38.8°C ± 0.2°C) trial (t1 = 8.04, P = .005). Sweat rate was lower during the DEH (0.44 ± 0.16 mg·m−2·s−1) than EUH (0.51 ± 0.16 mg·m−2·s−1) trial (t8 = 2.703, P = .03). Sweat sensitivity was lower during the DEH (72.6 ± 32 g·°C−1·min−1) than EUH (102.6 ± 54.2 g·°C−1·min−1) trial (t8 = 3.072, P = .02). Lastly, RPE after the exercise performance test was higher for the DEH (19.0 ± 1.0) than EUH (17.0 ± 1.0) participants (t9 = −3.36, P = .008). Conclusions: We found mild dehydration decreased cycling performance during a 5-km outdoor hill course, probably due to greater heat strain and greater perceived intensity.

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Metadata

Authors
Bardis, C. N., Kavouras, S. A., Arnaoutis, G., Panagiotakos, D. B., & Sidossis, L. S.
Affiliations
  • Department of Nutrition and Dietetics, Harokopio University, Athens, Greece
  • Department of Health, Human Performance and Recreation, University of Arkansas, Fayetteville
  • Department of Internal Medicine–Geriatrics, University of Texas Medical Branch at Galveston
Venue
Journal of Athletic Training
Publisher
National Athletic Trainers' Association
Published
2013-12-01
Volume
48
Issue
6
Pages
741-747
ISSN
1062-6050
DOI
10.4085/1062-6050-48.5.01
Cited by
59
References
2
Language
en

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CoChat. (2026). Citation check: Mild Dehydration and Cycling Performance During 5-Kilometer Hill Climbing. https://app.cochat.ai/papers/10.4085/1062-6050-48.5.01
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Bardis, C. N., Kavouras, S. A., Arnaoutis, G., Panagiotakos, D. B., & Sidossis, L. S. (2013). Mild Dehydration and Cycling Performance During 5-Kilometer Hill Climbing. Journal of Athletic Training. https://doi.org/10.4085/1062-6050-48.5.01

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