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1992 Publications

Effects of a Carbohydrate-Replacement Beverage on Cardiovascular and Renal Parameters Following B. Glace, G. Gleim FACSM, N. Stachenfeld, S. Lieberman, I. Wallach, J NicholasNISMAT, Lenox Hill Hospital, New York, N.Y. 10021 - last modified 2013-02-09 00:00
Med Sci Sports Exerc, 24(5):s121, 1992


Carbohydrate ingestion following exercise has been shown to elevate heart rate (HR) and systolic blood pressure (SBP), and to decrease diastolic blood pressure (DBP) in men. We evaluated the effects of a commercially available carbohydrate-replacement beverage on the renal and cardiovascular systems during recovery.

After cycle exercise for 1 hour at 70% heart rate reserve, 8 men drank 1 liter of mineral water (W) or 1 liter of a commercial beverage (C) (150 gms glucose polymers, 50 gms fructose, 500 mg potassium). Order of beverage was alternated between subjects. Recovery was monitored for 2 hours post exercise. HR, SBP and rate pressure product (HR x SBP/100) were elevated following C compared to W (P<=.03,P<=.04, P<=.01, respectively). DBP was lower at 2 hours after C (P=.02). Serum glucose was higher with C at 30 minutes only (P<.001), while insulin remained elevated at all measurements (P<.05).

Area under the curve for serum potassium (K) was lower after C (P=.05). Urinary excretion of K, sodium and creatinine did not differ between treatments. Serum aldosterone tended to be lower with C (P=.07). No differences were observed for plasma renin.

Carbohydrate ingestion after exercise significantly delays the recovery of cardiovascular parameters. However, lower serum potassium with C may result from elevated insulin and may indicate enhanced potassium transport into the cells.