Colonic fermentation after ingestion of fructose-containing sports drink.
BACKGROUND
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.


METHODS
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.


RESULTS
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.


CONCLUSIONS
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.
Mitsui
T
T
Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya, Japan. g960305d@mbox.media.nagoya-u.ac.jp
Shimaoka
K
K
Kanao
Y
Y
Kondo
T
T
D000328:Adult; D001628:Beverages / Q000009:adverse effects*; D001944:Breath Tests; D003106:Colon / Q000378:metabolism*; D005260:Female; D005285:Fermentation; D005632:Fructose / Q000009:adverse effects / Q000378:metabolism*; D006801:Humans; D006859:Hydrogen / Q000032:analysis / Q000378:metabolism; D007564:Japan; D008297:Male
D005632:Fructose; D006859:Hydrogen