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Fluid replacement during and after exercise in the heat.
Med Sci Sports Exerc. 1989 Oct; 21(5):532-9.MS

Abstract

This study sought to determine whether ad libitum drinking of a carbohydrate-electrolyte (CE) beverage would minimize the physiological disturbances associated with prolonged (3 h) continuous exercise in the heat (Tdb = 31.5 degrees C, percent RH = 22.3). Seven male subjects performed two bouts of cycle exercise (60% VO2max) drinking either a CE beverage (4.85% polycose, 2.65% fructose) or distilled water. Subjects continued to drink ad libitum for 3 h during recovery in the heat. No significant differences were observed between drinks for rectal temperature, heart rate, or sweat rate during exercise. Subjects tended to drink more (P less than 0.0565) water than the CE beverage during exercise, but plasma volume (percent PV) decreased less (P less than 0.0253) and plasma [(glucose], P less than 0.0001 and [K+], P less than 0.0047) were higher when subjects drank the CE solution. At the end of exercise, plasma osmolality and [Na+] were also higher (P less than 0.05) when subjects drank the CE beverage rather than water. Rating of perceived exertion was higher (P less than 0.0001) when drinking water. In recovery, ingesting the CE beverage, 1) subjects drank more (P less than 0.0012); 2) plasma volume increased to a higher level (P less than 0.0017); 3) plasma osmolality (P less than 0.0001), [Na+] (P less than 0.0001), glucose (P less than 0.0001), and [K+] (P less than 0.0015) were greater; and 4) body weight increased more (P less than 0.0422) than when water was ingested. Thus, in terms of minimizing physiological disturbances, ad libitum drinking of the CE beverage was as effective as drinking water during exercise but was more effective in recovery.

Authors+Show Affiliations

Department of Exercise Science, University of Iowa, Iowa City 52242.No affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

2607945

Citation

Carter, J E., and C V. Gisolfi. "Fluid Replacement During and After Exercise in the Heat." Medicine and Science in Sports and Exercise, vol. 21, no. 5, 1989, pp. 532-9.
Carter JE, Gisolfi CV. Fluid replacement during and after exercise in the heat. Med Sci Sports Exerc. 1989;21(5):532-9.
Carter, J. E., & Gisolfi, C. V. (1989). Fluid replacement during and after exercise in the heat. Medicine and Science in Sports and Exercise, 21(5), 532-9.
Carter JE, Gisolfi CV. Fluid Replacement During and After Exercise in the Heat. Med Sci Sports Exerc. 1989;21(5):532-9. PubMed PMID: 2607945.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fluid replacement during and after exercise in the heat. AU - Carter,J E, AU - Gisolfi,C V, PY - 1989/10/1/pubmed PY - 1989/10/1/medline PY - 1989/10/1/entrez SP - 532 EP - 9 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 21 IS - 5 N2 - This study sought to determine whether ad libitum drinking of a carbohydrate-electrolyte (CE) beverage would minimize the physiological disturbances associated with prolonged (3 h) continuous exercise in the heat (Tdb = 31.5 degrees C, percent RH = 22.3). Seven male subjects performed two bouts of cycle exercise (60% VO2max) drinking either a CE beverage (4.85% polycose, 2.65% fructose) or distilled water. Subjects continued to drink ad libitum for 3 h during recovery in the heat. No significant differences were observed between drinks for rectal temperature, heart rate, or sweat rate during exercise. Subjects tended to drink more (P less than 0.0565) water than the CE beverage during exercise, but plasma volume (percent PV) decreased less (P less than 0.0253) and plasma [(glucose], P less than 0.0001 and [K+], P less than 0.0047) were higher when subjects drank the CE solution. At the end of exercise, plasma osmolality and [Na+] were also higher (P less than 0.05) when subjects drank the CE beverage rather than water. Rating of perceived exertion was higher (P less than 0.0001) when drinking water. In recovery, ingesting the CE beverage, 1) subjects drank more (P less than 0.0012); 2) plasma volume increased to a higher level (P less than 0.0017); 3) plasma osmolality (P less than 0.0001), [Na+] (P less than 0.0001), glucose (P less than 0.0001), and [K+] (P less than 0.0015) were greater; and 4) body weight increased more (P less than 0.0422) than when water was ingested. Thus, in terms of minimizing physiological disturbances, ad libitum drinking of the CE beverage was as effective as drinking water during exercise but was more effective in recovery. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/2607945/Fluid_replacement_during_and_after_exercise_in_the_heat_ L2 - https://Insights.ovid.com/pubmed?pmid=2607945 DB - PRIME DP - Unbound Medicine ER -