Mild dehydration and cycling performance during 5-kilometer hill climbing

Costas N. Bardis, Stavros A. Kavouras, Giannis Arnaoutis, Demosthenes B. Panagiotakos, Labros S. Sidossis

Research output: Contribution to journalArticle

31 Citations (Scopus)

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 = 29.08C 6 2.28C). Design: Crossover study. Setting: Outdoor. Patients or Other Participants: Ten well-trained, male endurance cyclists (age = 28 6 5 years, height = 182 6 0.4 cm, mass=7364 kg,maximal oxygen uptake=5669mL-min -1-kg-1, body fat=23% 6 2%, maximal power=354 6 48 W). Intervention(s): Participants completed 1 hour of steadystate cycling with or without drinking to achieve the desired preexercise 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 6 2.3 minutes) than DEH (17.6 6 2.9 minutes) trial (t1=10.221, P=.001). Postexercise body mass was-1.4% 6 0.3% for the EUH trial and-2.2% 6 0.2% for the DEH trial (t1 = 191.384, P , .001). Core temperature after the climb was greater during the DEH (39.28C 6 0.38C) than EUH (38.88C 6 0.28C) trial (t1=8.04, P=.005). Sweat rate was lower during the DEH (0.44 6 0.16 mg-m-2-s-1) than EUH (0.51 6 0.16 mg-m -2-s-1) trial (t8 = 2.703, P = .03). Sweat sensitivity was lower during the DEH (72.6 6 32 g-8C-1-min-1) than EUH (102.6 6 54.2 g-8C-1-min-1) trial (t8 = 3.072, P = .02). Lastly, RPE after the exercise performance test was higher for the DEH (19.0 6 1.0) than EUH (17.0 6 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.

Original languageEnglish (US)
Pages (from-to)741-747
Number of pages7
JournalJournal of Athletic Training
Volume48
Issue number6
DOIs
StatePublished - Nov 2013

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Sweat
Dehydration
Temperature
Hot Temperature
Exercise Test
Cross-Over Studies
Drinking
Adipose Tissue
Outcome Assessment (Health Care)
Oxygen

Keywords

  • Exercise
  • Heat stress
  • Hydration status
  • Hyperthermia
  • Hypohydration

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

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, 48(6), 741-747. https://doi.org/10.4085/1062-6050-48.5.01

Mild dehydration and cycling performance during 5-kilometer hill climbing. / Bardis, Costas N.; Kavouras, Stavros A.; Arnaoutis, Giannis; Panagiotakos, Demosthenes B.; Sidossis, Labros S.

In: Journal of Athletic Training, Vol. 48, No. 6, 11.2013, p. 741-747.

Research output: Contribution to journalArticle

Bardis, CN, Kavouras, SA, Arnaoutis, G, Panagiotakos, DB & Sidossis, LS 2013, 'Mild dehydration and cycling performance during 5-kilometer hill climbing', Journal of Athletic Training, vol. 48, no. 6, pp. 741-747. https://doi.org/10.4085/1062-6050-48.5.01
Bardis CN, Kavouras SA, Arnaoutis G, Panagiotakos DB, Sidossis LS. Mild dehydration and cycling performance during 5-kilometer hill climbing. Journal of Athletic Training. 2013 Nov;48(6):741-747. https://doi.org/10.4085/1062-6050-48.5.01
Bardis, Costas N. ; Kavouras, Stavros A. ; Arnaoutis, Giannis ; Panagiotakos, Demosthenes B. ; Sidossis, Labros S. / Mild dehydration and cycling performance during 5-kilometer hill climbing. In: Journal of Athletic Training. 2013 ; Vol. 48, No. 6. pp. 741-747.
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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 = 29.08C 6 2.28C). Design: Crossover study. Setting: Outdoor. Patients or Other Participants: Ten well-trained, male endurance cyclists (age = 28 6 5 years, height = 182 6 0.4 cm, mass=7364 kg,maximal oxygen uptake=5669mL-min -1-kg-1, body fat=23{\%} 6 2{\%}, maximal power=354 6 48 W). Intervention(s): Participants completed 1 hour of steadystate cycling with or without drinking to achieve the desired preexercise 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 6 2.3 minutes) than DEH (17.6 6 2.9 minutes) trial (t1=10.221, P=.001). Postexercise body mass was-1.4{\%} 6 0.3{\%} for the EUH trial and-2.2{\%} 6 0.2{\%} for the DEH trial (t1 = 191.384, P , .001). Core temperature after the climb was greater during the DEH (39.28C 6 0.38C) than EUH (38.88C 6 0.28C) trial (t1=8.04, P=.005). Sweat rate was lower during the DEH (0.44 6 0.16 mg-m-2-s-1) than EUH (0.51 6 0.16 mg-m -2-s-1) trial (t8 = 2.703, P = .03). Sweat sensitivity was lower during the DEH (72.6 6 32 g-8C-1-min-1) than EUH (102.6 6 54.2 g-8C-1-min-1) trial (t8 = 3.072, P = .02). Lastly, RPE after the exercise performance test was higher for the DEH (19.0 6 1.0) than EUH (17.0 6 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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AU - Bardis, Costas N.

AU - Kavouras, Stavros A.

AU - Arnaoutis, Giannis

AU - Panagiotakos, Demosthenes B.

AU - Sidossis, Labros S.

PY - 2013/11

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N2 - 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 = 29.08C 6 2.28C). Design: Crossover study. Setting: Outdoor. Patients or Other Participants: Ten well-trained, male endurance cyclists (age = 28 6 5 years, height = 182 6 0.4 cm, mass=7364 kg,maximal oxygen uptake=5669mL-min -1-kg-1, body fat=23% 6 2%, maximal power=354 6 48 W). Intervention(s): Participants completed 1 hour of steadystate cycling with or without drinking to achieve the desired preexercise 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 6 2.3 minutes) than DEH (17.6 6 2.9 minutes) trial (t1=10.221, P=.001). Postexercise body mass was-1.4% 6 0.3% for the EUH trial and-2.2% 6 0.2% for the DEH trial (t1 = 191.384, P , .001). Core temperature after the climb was greater during the DEH (39.28C 6 0.38C) than EUH (38.88C 6 0.28C) trial (t1=8.04, P=.005). Sweat rate was lower during the DEH (0.44 6 0.16 mg-m-2-s-1) than EUH (0.51 6 0.16 mg-m -2-s-1) trial (t8 = 2.703, P = .03). Sweat sensitivity was lower during the DEH (72.6 6 32 g-8C-1-min-1) than EUH (102.6 6 54.2 g-8C-1-min-1) trial (t8 = 3.072, P = .02). Lastly, RPE after the exercise performance test was higher for the DEH (19.0 6 1.0) than EUH (17.0 6 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.

AB - 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 = 29.08C 6 2.28C). Design: Crossover study. Setting: Outdoor. Patients or Other Participants: Ten well-trained, male endurance cyclists (age = 28 6 5 years, height = 182 6 0.4 cm, mass=7364 kg,maximal oxygen uptake=5669mL-min -1-kg-1, body fat=23% 6 2%, maximal power=354 6 48 W). Intervention(s): Participants completed 1 hour of steadystate cycling with or without drinking to achieve the desired preexercise 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 6 2.3 minutes) than DEH (17.6 6 2.9 minutes) trial (t1=10.221, P=.001). Postexercise body mass was-1.4% 6 0.3% for the EUH trial and-2.2% 6 0.2% for the DEH trial (t1 = 191.384, P , .001). Core temperature after the climb was greater during the DEH (39.28C 6 0.38C) than EUH (38.88C 6 0.28C) trial (t1=8.04, P=.005). Sweat rate was lower during the DEH (0.44 6 0.16 mg-m-2-s-1) than EUH (0.51 6 0.16 mg-m -2-s-1) trial (t8 = 2.703, P = .03). Sweat sensitivity was lower during the DEH (72.6 6 32 g-8C-1-min-1) than EUH (102.6 6 54.2 g-8C-1-min-1) trial (t8 = 3.072, P = .02). Lastly, RPE after the exercise performance test was higher for the DEH (19.0 6 1.0) than EUH (17.0 6 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.

KW - Exercise

KW - Heat stress

KW - Hydration status

KW - Hyperthermia

KW - Hypohydration

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