PMID: 11317159Apr 24, 2001Paper

Colonic fermentation after ingestion of fructose-containing sports drink

The Journal of Sports Medicine and Physical Fitness
T MitsuiT Kondo

Abstract

Many commercially available sports drinks contain 5-6% carbohydrates, some of which is fructose. However, a number of studies of abdominal complaints have indicated fructose malabsorption. In the present study, we examined colonic fermentation of a fructose-containing sports drink. Colonic fermentation was determined in normal subjects by measuring breath hydrogen after ingestion of 350 ml sports drink, cow s milk, or green tea with a 200 g rice ball. The incidence of colonic fermentation after ingesting sports drink, milk, and green tea was five (62.5%), six (75%), and none (0%), respectively in eight subjects. Peak increases (ppm) after ingestion of sports drink and milk varied from 0 to 6 (3.1 +/- 0.9) and 0 to 12 (6.5 +/- 1.7), respectively. Although the increase of breath hydrogen was not associated with abdominal discomfort and its effect on exercise is still unclear, we suggest avoiding a large ingestion of fructose-containing sports drink before and during exercise.

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