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Int J Sport Nutr Exerc Metab. 2007 Apr;17(2):140-51.

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

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Bethune College, York University, Toronto, ON, Canada.


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.

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