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Pre-exercise hyperhydration delays dehydration and improves endurance capacity during 2 h of cycling in a temperate climate.
J Physiol Anthropol. 2008 Sep; 27(5):263-71.JP

Abstract

Whether the use of pre-exercise hyperhydration could improve the performance of athletes who do not hydrate sufficiently during prolonged exercise is still unknown. We therefore compared the effects of pre-exercise hyperhydration and pre-exercise euhydration on endurance capacity, peak power output and selected components of the cardiovascular and thermoregulatory systems during prolonged cycling. Using a randomized, crossover experimental design, 6 endurance-trained subjects underwent a pre-exercise hyperhydration (26 ml of water x kg body mass(-1) with 1.2 g glycerol x kg body mass(-1)) or pre-exercise euhydration period of 80 min, followed by 2 h of cycling at 65% maximal oxygen consumption (VO(.)2max) (26-27 degrees C) that were interspersed by 5, 2-min intervals performed at 80% V(.)O2max. Following the 2 h cycling exercise, subjects underwent an incremental cycling test to exhaustion. Pre-exercise hyperhydration increased body water by 16.1+/-2.2 ml.kg body mass(-1). During exercise, subjects received 12.5 ml of sports drink x kg body mass(-1). With pre-exercise hyperhydration and pre-exercise euhydration, respectively, fluid ingestion during exercise replaced 31.0+/-2.9% and 37.1+/-6.8% of sweat losses (p>0.05). Body mass loss at the end of exercise reached 1.7+/-0.3% with pre-exercise hyperhydration and 3.3+/-0.4% with pre-exercise euhydration (p<0.05). During the 2 h of cycling, pre-exercise hyperhydration significantly decreased heart rate and perceived thirst, but rectal temperature, sweat rate, perceived exertion and perceived heat-stress did not differ between conditions. Pre-exercise hyperhydration significantly increased time to exhaustion and peak power output, compared with pre-exercise euhydration. We conclude that pre-exercise hyperhydration improves endurance capacity and peak power output and decreases heart rate and thirst sensation, but does not reduce rectal temperature during 2 h of moderate to intense cycling in a moderate environment when fluid consumption is 33% of sweat losses.

Authors+Show Affiliations

Research Centre on Aging, University of Sherbrooke, Sherbrooke, P.Q., Canada.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

18838842

Citation

Goulet, Eric D B., et al. "Pre-exercise Hyperhydration Delays Dehydration and Improves Endurance Capacity During 2 H of Cycling in a Temperate Climate." Journal of Physiological Anthropology, vol. 27, no. 5, 2008, pp. 263-71.
Goulet ED, Rousseau SF, Lamboley CR, et al. Pre-exercise hyperhydration delays dehydration and improves endurance capacity during 2 h of cycling in a temperate climate. J Physiol Anthropol. 2008;27(5):263-71.
Goulet, E. D., Rousseau, S. F., Lamboley, C. R., Plante, G. E., & Dionne, I. J. (2008). Pre-exercise hyperhydration delays dehydration and improves endurance capacity during 2 h of cycling in a temperate climate. Journal of Physiological Anthropology, 27(5), 263-71.
Goulet ED, et al. Pre-exercise Hyperhydration Delays Dehydration and Improves Endurance Capacity During 2 H of Cycling in a Temperate Climate. J Physiol Anthropol. 2008;27(5):263-71. PubMed PMID: 18838842.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pre-exercise hyperhydration delays dehydration and improves endurance capacity during 2 h of cycling in a temperate climate. AU - Goulet,Eric D B, AU - Rousseau,Stéphane F, AU - Lamboley,Cédric R H, AU - Plante,Gérard E, AU - Dionne,Isabelle J, PY - 2008/10/8/pubmed PY - 2009/1/1/medline PY - 2008/10/8/entrez SP - 263 EP - 71 JF - Journal of physiological anthropology JO - J Physiol Anthropol VL - 27 IS - 5 N2 - Whether the use of pre-exercise hyperhydration could improve the performance of athletes who do not hydrate sufficiently during prolonged exercise is still unknown. We therefore compared the effects of pre-exercise hyperhydration and pre-exercise euhydration on endurance capacity, peak power output and selected components of the cardiovascular and thermoregulatory systems during prolonged cycling. Using a randomized, crossover experimental design, 6 endurance-trained subjects underwent a pre-exercise hyperhydration (26 ml of water x kg body mass(-1) with 1.2 g glycerol x kg body mass(-1)) or pre-exercise euhydration period of 80 min, followed by 2 h of cycling at 65% maximal oxygen consumption (VO(.)2max) (26-27 degrees C) that were interspersed by 5, 2-min intervals performed at 80% V(.)O2max. Following the 2 h cycling exercise, subjects underwent an incremental cycling test to exhaustion. Pre-exercise hyperhydration increased body water by 16.1+/-2.2 ml.kg body mass(-1). During exercise, subjects received 12.5 ml of sports drink x kg body mass(-1). With pre-exercise hyperhydration and pre-exercise euhydration, respectively, fluid ingestion during exercise replaced 31.0+/-2.9% and 37.1+/-6.8% of sweat losses (p>0.05). Body mass loss at the end of exercise reached 1.7+/-0.3% with pre-exercise hyperhydration and 3.3+/-0.4% with pre-exercise euhydration (p<0.05). During the 2 h of cycling, pre-exercise hyperhydration significantly decreased heart rate and perceived thirst, but rectal temperature, sweat rate, perceived exertion and perceived heat-stress did not differ between conditions. Pre-exercise hyperhydration significantly increased time to exhaustion and peak power output, compared with pre-exercise euhydration. We conclude that pre-exercise hyperhydration improves endurance capacity and peak power output and decreases heart rate and thirst sensation, but does not reduce rectal temperature during 2 h of moderate to intense cycling in a moderate environment when fluid consumption is 33% of sweat losses. SN - 1880-6805 UR - https://www.unboundmedicine.com/medline/citation/18838842/Pre_exercise_hyperhydration_delays_dehydration_and_improves_endurance_capacity_during_2_h_of_cycling_in_a_temperate_climate_ L2 - http://joi.jlc.jst.go.jp/JST.JSTAGE/jpa2/27.263?from=PubMed DB - PRIME DP - Unbound Medicine ER -