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Effects of glycerol-induced hyperhydration prior to exercise in the heat on sweating and core temperature.
Med Sci Sports Exerc. 1990 Aug; 22(4):477-83.MS

Abstract

Hypohydration reduces exercise performance and thermoregulatory capacity in the heat. Hyperhydration prior to exercise may decrease, delay, or eliminate the detrimental effects of hypohydration. The rapid clearance of excess fluid makes hyperhydration of subjects with common beverages difficult. Glycerol, a natural metabolite which is rapidly absorbed, has osmotic action, and is evenly distributed within the body fluid compartments, was tested as a possible hyperhydrating agent. In six subjects, the following fluid regimens at time 0 were randomly administered on three separate days: in trial 1, glycerol (1 g.kg-1 body weight) plus water (21.4 ml.kg-1 body weight); in trial 2, water (21.4 ml.kg-1); and in trial 3, water (3.3 ml.kg-1) was ingested at time 0. The subjects performed moderate exercise (equivalent to 60% VO2max in a comfortable environment) in a hot dry environment. The exercise started at 2.5 h after the fluids were ingested. The urine volume prior to exercise was decreased when glycerol was ingested, thus resulting in glycerol-induced hyperhydration. During the exercise following the glycerol-induced hyperhydration, there was elevated sweat rate and lower rectal temperature during the moderate exercise in the heat. There were no changes in hemoglobin, hematocrit, or serum electrolyte concentrations following glycerol intake. These data support the hypothesis that glycerol-induced hyperhydration reduces the thermal burden of moderate exercise in the heat.

Authors+Show Affiliations

Department of Biology, University of New Mexico, Albuquerque 87131.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

2402207

Citation

Lyons, T P., et al. "Effects of Glycerol-induced Hyperhydration Prior to Exercise in the Heat On Sweating and Core Temperature." Medicine and Science in Sports and Exercise, vol. 22, no. 4, 1990, pp. 477-83.
Lyons TP, Riedesel ML, Meuli LE, et al. Effects of glycerol-induced hyperhydration prior to exercise in the heat on sweating and core temperature. Med Sci Sports Exerc. 1990;22(4):477-83.
Lyons, T. P., Riedesel, M. L., Meuli, L. E., & Chick, T. W. (1990). Effects of glycerol-induced hyperhydration prior to exercise in the heat on sweating and core temperature. Medicine and Science in Sports and Exercise, 22(4), 477-83.
Lyons TP, et al. Effects of Glycerol-induced Hyperhydration Prior to Exercise in the Heat On Sweating and Core Temperature. Med Sci Sports Exerc. 1990;22(4):477-83. PubMed PMID: 2402207.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of glycerol-induced hyperhydration prior to exercise in the heat on sweating and core temperature. AU - Lyons,T P, AU - Riedesel,M L, AU - Meuli,L E, AU - Chick,T W, PY - 1990/8/1/pubmed PY - 1990/8/1/medline PY - 1990/8/1/entrez SP - 477 EP - 83 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 22 IS - 4 N2 - Hypohydration reduces exercise performance and thermoregulatory capacity in the heat. Hyperhydration prior to exercise may decrease, delay, or eliminate the detrimental effects of hypohydration. The rapid clearance of excess fluid makes hyperhydration of subjects with common beverages difficult. Glycerol, a natural metabolite which is rapidly absorbed, has osmotic action, and is evenly distributed within the body fluid compartments, was tested as a possible hyperhydrating agent. In six subjects, the following fluid regimens at time 0 were randomly administered on three separate days: in trial 1, glycerol (1 g.kg-1 body weight) plus water (21.4 ml.kg-1 body weight); in trial 2, water (21.4 ml.kg-1); and in trial 3, water (3.3 ml.kg-1) was ingested at time 0. The subjects performed moderate exercise (equivalent to 60% VO2max in a comfortable environment) in a hot dry environment. The exercise started at 2.5 h after the fluids were ingested. The urine volume prior to exercise was decreased when glycerol was ingested, thus resulting in glycerol-induced hyperhydration. During the exercise following the glycerol-induced hyperhydration, there was elevated sweat rate and lower rectal temperature during the moderate exercise in the heat. There were no changes in hemoglobin, hematocrit, or serum electrolyte concentrations following glycerol intake. These data support the hypothesis that glycerol-induced hyperhydration reduces the thermal burden of moderate exercise in the heat. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/2402207/Effects_of_glycerol_induced_hyperhydration_prior_to_exercise_in_the_heat_on_sweating_and_core_temperature_ L2 - http://Insights.ovid.com/pubmed?pmid=2402207 DB - PRIME DP - Unbound Medicine ER -