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Glycerol hyperhydration fails to improve endurance performance and thermoregulation in humans in a warm humid environment.
Pflugers Arch. 2003 Jul; 446(4):455-62.PA

Abstract

It is equivocal whether glycerol hyperhydration improves exercise performance and thermoregulation in the heat. The purpose of this study was to compare the effectiveness of glycerol with water hyperhydration, using a reliable, self-paced variable-intensity cycling protocol under hot, humid conditions. Seven moderately-to-well trained subjects ingested either a solution consisting of 1.2 g kg(-1) body mass (BM) glycerol mixed with 21 ml kg(-1) BM flavoured water (GLY) or placebo (PL), which was flavoured water of equal volume to the GLY trial, 2.5 h before exercise. Following hyperhydration, subjects undertook a self-paced, variable-intensity cycling protocol designed to simulate racing, with the aim being to cycle as great a distance as possible over 60 min. There were no differences in total distance cycled between conditions (29.7+/-5.7 km for PL, 28.9+/-5.7 km for GLY). Power output was not different at any time between conditions. Terminal rectal temperatures were 39.0+/-0.5 degrees C for PL and 38.8+/-0.7 degrees C for GLY and were not significantly different. Heart rate was significantly higher for GLY only during the high-intensity efforts. The sweat rate for GLY was 1.72+/-0.28 l h(-1) (P<0.01) compared with 1.15+/-0.29 l h(-1) for PL. It is concluded that glycerol hyperhydration has no significant advantage over water hyperhydration on performance or thermoregulation during a 1-h, variable-intensity exercise performance.

Authors+Show Affiliations

Human Movement Studies Unit and Human Performance Laboratory, Charles Sturt University, NSW 2795 Bathurst, Australia. fmarino@csu.edu.auNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

12695914

Citation

Marino, Frank E., et al. "Glycerol Hyperhydration Fails to Improve Endurance Performance and Thermoregulation in Humans in a Warm Humid Environment." Pflugers Archiv : European Journal of Physiology, vol. 446, no. 4, 2003, pp. 455-62.
Marino FE, Kay D, Cannon J. Glycerol hyperhydration fails to improve endurance performance and thermoregulation in humans in a warm humid environment. Pflugers Arch. 2003;446(4):455-62.
Marino, F. E., Kay, D., & Cannon, J. (2003). Glycerol hyperhydration fails to improve endurance performance and thermoregulation in humans in a warm humid environment. Pflugers Archiv : European Journal of Physiology, 446(4), 455-62.
Marino FE, Kay D, Cannon J. Glycerol Hyperhydration Fails to Improve Endurance Performance and Thermoregulation in Humans in a Warm Humid Environment. Pflugers Arch. 2003;446(4):455-62. PubMed PMID: 12695914.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Glycerol hyperhydration fails to improve endurance performance and thermoregulation in humans in a warm humid environment. AU - Marino,Frank E, AU - Kay,Derek, AU - Cannon,Jack, Y1 - 2003/04/15/ PY - 2002/07/03/received PY - 2003/01/13/revised PY - 2003/02/06/accepted PY - 2003/4/16/pubmed PY - 2004/4/7/medline PY - 2003/4/16/entrez SP - 455 EP - 62 JF - Pflugers Archiv : European journal of physiology JO - Pflugers Arch. VL - 446 IS - 4 N2 - It is equivocal whether glycerol hyperhydration improves exercise performance and thermoregulation in the heat. The purpose of this study was to compare the effectiveness of glycerol with water hyperhydration, using a reliable, self-paced variable-intensity cycling protocol under hot, humid conditions. Seven moderately-to-well trained subjects ingested either a solution consisting of 1.2 g kg(-1) body mass (BM) glycerol mixed with 21 ml kg(-1) BM flavoured water (GLY) or placebo (PL), which was flavoured water of equal volume to the GLY trial, 2.5 h before exercise. Following hyperhydration, subjects undertook a self-paced, variable-intensity cycling protocol designed to simulate racing, with the aim being to cycle as great a distance as possible over 60 min. There were no differences in total distance cycled between conditions (29.7+/-5.7 km for PL, 28.9+/-5.7 km for GLY). Power output was not different at any time between conditions. Terminal rectal temperatures were 39.0+/-0.5 degrees C for PL and 38.8+/-0.7 degrees C for GLY and were not significantly different. Heart rate was significantly higher for GLY only during the high-intensity efforts. The sweat rate for GLY was 1.72+/-0.28 l h(-1) (P<0.01) compared with 1.15+/-0.29 l h(-1) for PL. It is concluded that glycerol hyperhydration has no significant advantage over water hyperhydration on performance or thermoregulation during a 1-h, variable-intensity exercise performance. SN - 0031-6768 UR - https://www.unboundmedicine.com/medline/citation/12695914/Glycerol_hyperhydration_fails_to_improve_endurance_performance_and_thermoregulation_in_humans_in_a_warm_humid_environment_ L2 - https://dx.doi.org/10.1007/s00424-003-1058-3 DB - PRIME DP - Unbound Medicine ER -