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Mild dehydration and cycling performance during 5-kilometer hill climbing.
J Athl Train. 2013 Nov-Dec; 48(6):741-7.JA

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.

Authors+Show Affiliations

Department of Nutrition and Dietetics, Harokopio University, Athens, Greece.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23952038

Citation

Bardis, Costas N., et al. "Mild Dehydration and Cycling Performance During 5-kilometer Hill Climbing." Journal of Athletic Training, vol. 48, no. 6, 2013, pp. 741-7.
Bardis CN, Kavouras SA, Arnaoutis G, et al. Mild dehydration and cycling performance during 5-kilometer hill climbing. J Athl Train. 2013;48(6):741-7.
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), 741-7. https://doi.org/10.4085/1062-6050-48.5.01
Bardis CN, et al. Mild Dehydration and Cycling Performance During 5-kilometer Hill Climbing. J Athl Train. 2013 Nov-Dec;48(6):741-7. PubMed PMID: 23952038.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mild dehydration and cycling performance during 5-kilometer hill climbing. AU - Bardis,Costas N, AU - Kavouras,Stavros A, AU - Arnaoutis,Giannis, AU - Panagiotakos,Demosthenes B, AU - Sidossis,Labros S, Y1 - 2013/08/16/ PY - 2013/8/20/entrez PY - 2013/8/21/pubmed PY - 2014/8/30/medline SP - 741 EP - 7 JF - Journal of athletic training JO - J Athl Train VL - 48 IS - 6 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 = 29.0°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. SN - 1938-162X UR - https://www.unboundmedicine.com/medline/citation/23952038/Mild_dehydration_and_cycling_performance_during_5_kilometer_hill_climbing_ L2 - https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23952038/ DB - PRIME DP - Unbound Medicine ER -