Hide All

1992 Publications

Systemic Effects Of A Commercial Carbohydrate-Replacement Beverage On Recovery From Exerciseby Glace B, Gleim GW, Stachenfeld NS, Wallach I, Nicholas JA.NISMAT, Lenox Hill Hospital, New York, NY 10021 USA. - last modified 2013-02-09 00:00
Journal of the American College of Nutrition. Vol. 11, No. 5, 618 (1992).


Ingestion of sugars post exercise has been shown to reduce elevations in systolic blood pressure (SBP) and heart rate (HR) in normotensive men. We examined the cardiovascular and hormonal effects of ingestion of a commercial carbohydrate ( C ) replacement beverage containing 75% glucose polymer, 25% fructose and 3mg potassium (K) per kg body weight on recovery from exercise.

Eight men volunteered to cycle for 1 hour at 70% heart rate reverse on 2 separate days. Immediately following exercise, and at 2 hours post, they consumed either 1 L of C (1.5 g C/kg body weight) or 1 L of water. Recovery was monitored for 4 hours with heart, blood pressure and blood samples taken at hourly intervals. Hr and rate pressure product (Hr x SBP) were elevated after C compared to W (MANOVA, p = 0.001, p = 0.025, respectively).

No effect of beverage was seen for SBP. Plasma osmolality was higher in the C treatment (MANOVA, p = 0.045). Diastolic blood pressure (DBP) was lower after C (p = 0.047). Aldosterone, and urinary excretion of K at 4 hours recovery tended to be lower (p = 0.06, p = 0.07) after C. No differences were seen in renin or serum sodium between treatments.

Urine production was less at 2 hours with carbohydrate (p = 0.026). Ingestion of a glucose polymer/fructose beverage following exercise resulted in significant reductions in DBP, and increases in HR and RPP, an index of myocardial oxygen demand.

The elevations of glucose and insulin may lead to the observed decreases in serum K and aldosterone. These changes may result from reduced absorption from the gut or from improved flux of water from the vascular to interstitial and intracellular spaces following carbohydrate consumption.