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Effect of glycerol-induced hyperhydration on thermoregulatory and cardiovascular functions and endurance performance during prolonged cycling in a 25 degrees C environment.
Appl Physiol Nutr Metab. 2006 Apr; 31(2):101-9.AP

Abstract

We compared the effect of glycerol-induced hyperhydration (GIH) to that of water-induced hyperhydration (WIH) on cardiovascular and thermoregulatory functions and endurance performance (EP) during prolonged cycling in a temperate climate in subjects consuming fluid during exercise. At weekly intervals, 6 trained male subjects ingested, in a randomized, double-blind, counterbalanced fashion, either a glycerol (1.2 g glycerol/kg bodyweight (BW) with 26 mL/kg BW of water-aspartame-flavored fluid) or placebo solution (water-aspartame-flavored fluid only) over a 2 h period. Subjects then performed 2 h of cycling at 66% of the maximal oxygen consumption (VO(2) max) and 25 degrees C while drinking 500 mL/h of sports drink, which was followed by a step-incremented cycling test to exhaustion. Levels of hyperhydration did not differ significantly between treatments before exercise. During exercise, GIH significantly reduced urine production by 246 mL. GIH did not increase sweat rate nor did it decrease heart rate, rectal temperature, or perceived exertion during exercise as compared with WIH. EP was not significantly different between treatments. Neither treatment induced undesirable side effects. It is concluded that, compared with WIH, GIH decreases urine production, but does not improve cardiovascular or thermoregulatory functions, nor does it improve EP during 2 h of cycling in a 25 degrees C environment in trained athletes consuming 500 mL/h of fluid during exercise.

Authors+Show Affiliations

Geriatric Institute of the University of Sherbrooke, Sherbrooke, QC, Canada. eric.goulet@usherbrooke.caNo 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

16604127

Citation

Goulet, Eric D B., et al. "Effect of Glycerol-induced Hyperhydration On Thermoregulatory and Cardiovascular Functions and Endurance Performance During Prolonged Cycling in a 25 Degrees C Environment." Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme, vol. 31, no. 2, 2006, pp. 101-9.
Goulet ED, Robergs RA, Labrecque S, et al. Effect of glycerol-induced hyperhydration on thermoregulatory and cardiovascular functions and endurance performance during prolonged cycling in a 25 degrees C environment. Appl Physiol Nutr Metab. 2006;31(2):101-9.
Goulet, E. D., Robergs, R. A., Labrecque, S., Royer, D., & Dionne, I. J. (2006). Effect of glycerol-induced hyperhydration on thermoregulatory and cardiovascular functions and endurance performance during prolonged cycling in a 25 degrees C environment. Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme, 31(2), 101-9.
Goulet ED, et al. Effect of Glycerol-induced Hyperhydration On Thermoregulatory and Cardiovascular Functions and Endurance Performance During Prolonged Cycling in a 25 Degrees C Environment. Appl Physiol Nutr Metab. 2006;31(2):101-9. PubMed PMID: 16604127.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of glycerol-induced hyperhydration on thermoregulatory and cardiovascular functions and endurance performance during prolonged cycling in a 25 degrees C environment. AU - Goulet,Eric D B, AU - Robergs,Robert A, AU - Labrecque,Susan, AU - Royer,Donald, AU - Dionne,Isabelle J, PY - 2006/4/11/pubmed PY - 2006/9/20/medline PY - 2006/4/11/entrez SP - 101 EP - 9 JF - Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme JO - Appl Physiol Nutr Metab VL - 31 IS - 2 N2 - We compared the effect of glycerol-induced hyperhydration (GIH) to that of water-induced hyperhydration (WIH) on cardiovascular and thermoregulatory functions and endurance performance (EP) during prolonged cycling in a temperate climate in subjects consuming fluid during exercise. At weekly intervals, 6 trained male subjects ingested, in a randomized, double-blind, counterbalanced fashion, either a glycerol (1.2 g glycerol/kg bodyweight (BW) with 26 mL/kg BW of water-aspartame-flavored fluid) or placebo solution (water-aspartame-flavored fluid only) over a 2 h period. Subjects then performed 2 h of cycling at 66% of the maximal oxygen consumption (VO(2) max) and 25 degrees C while drinking 500 mL/h of sports drink, which was followed by a step-incremented cycling test to exhaustion. Levels of hyperhydration did not differ significantly between treatments before exercise. During exercise, GIH significantly reduced urine production by 246 mL. GIH did not increase sweat rate nor did it decrease heart rate, rectal temperature, or perceived exertion during exercise as compared with WIH. EP was not significantly different between treatments. Neither treatment induced undesirable side effects. It is concluded that, compared with WIH, GIH decreases urine production, but does not improve cardiovascular or thermoregulatory functions, nor does it improve EP during 2 h of cycling in a 25 degrees C environment in trained athletes consuming 500 mL/h of fluid during exercise. SN - 1715-5312 UR - https://www.unboundmedicine.com/medline/citation/16604127/Effect_of_glycerol_induced_hyperhydration_on_thermoregulatory_and_cardiovascular_functions_and_endurance_performance_during_prolonged_cycling_in_a_25_degrees_C_environment_ L2 - http://www.nrcresearchpress.com/doi/full/10.1139/h05-006?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -