Preexercise carbohydrate consumption and repeated anaerobic performance in pre- and early-pubertal boys

Int J Sport Nutr Exerc Metab. 2007 Apr;17(2):140-51. doi: 10.1123/ijsnem.17.2.140.

Abstract

This study examined the effect of preexercise carbohydrate (CHO) feeding on performance on a Wingate anaerobic test (WAnT) in 11 boys (10.2 +/- 1.3 y old). Four WAnTs with 2 min recovery were performed 30 min after consuming a CHO (1 g CHO/kg) or placebo drink. Peak power (PP) and mean power (MP) were similar between trials. PP ranged from 241.1 +/- 82.2 to 223.1 +/- 57.9 W with carbohydrate and from 238.2 +/- 76.1 to 223.4 +/- 52.3 W with placebo. MP ranged from 176.3 +/- 58.4 to 151.1 +/- 37.5 W with carbohydrate versus 178.0 +/- 45.8 to 159.1 +/- 32.7 W with placebo. Preexercise glucose was significantly higher in CHO versus placebo (7.0 +/- 1.0 vs. 5.5 +/- 0.5 mmol/L), but postexercise values were not different. Blood lactate was similar between trials but increased over time. This study found that the ingestion of a CHO solution before exercise did not influence power output during repeated performances of the WAnT.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Beverages
  • Blood Glucose / metabolism*
  • Child
  • Cross-Over Studies
  • Dietary Carbohydrates / administration & dosage*
  • Dietary Carbohydrates / metabolism
  • Exercise / physiology*
  • Heart Rate / physiology
  • Humans
  • Lactic Acid / blood*
  • Male
  • Oxygen Consumption
  • Physical Endurance / drug effects
  • Physical Endurance / physiology*

Substances

  • Blood Glucose
  • Dietary Carbohydrates
  • Lactic Acid