Effect of carbohydrate ingestion on sprint performance following continuous and intermittent exercise


    loading  Checking for direct PDF access through Ovid

Abstract

Effect of carbohydrate ingestion on sprint performance following continuous and intermittent exercise. Med. Sci. Sports Exerc., Vol. 30, No. 11, pp. 1624-1630, 1998.Purpose:This investigation was conducted to study the effects on sprint performance of glucose and fructose ingestion during a 15-min rest period half way through 90 min of continuous and intermittent exercise. On three occasions, eight subjects cycled at 76 ± 2% V˙O2max for 90 min (continuous trials: CON trials) with a 15-min half-time break.Methods:On another three occasions, they cycled for 90 min between moderate (65% VO2max) and high (100% V˙O2max) intensity (intermittent trials: INT trials) with the same half-time. In both trials, 90-min exercise was followed by a 40-s Wingate test to evaluate remaining sprint capacity. During half-time, they consumed either 20% glucose polymer (G), 20% fructose (F) or sweet placebo (P). Ingestion of G maintained plasma glucose levels, carbohydrate oxidation rate and lower value of ratings of perceived exertion (RPE) in both trials and indicated higher sprint performance compared with P (mean power of CON trials: 614.3 ± 23.3 W vs 574.0 ± 22.7 W, P < 0.001, INT trials: 629.5 ± 27.6 W vs 596.3 ± 25.5 W, P < 0.01).Results:Ingestion of F showed similar effect in CON trials (603.8 ± 26.1 W vs 574.0 ± 22.7 W, P < 0.01) but had no positive effect in INT trials. Additionally, mean power of G was higher than F (629.5 ± 27.6 W vs 598.4 ± 34.2 W, P < 0.01) in INT trials.Conclusions:These results indicated that ingestion of G during half-time of 90-min exercise could maintain carbohydrate utilization and improve sprint performance in both CON and INT trials.

    loading  Loading Related Articles