It was hypothesized that slowly digested carbohydrates, that is, low glycemic index (GI) foods, eaten before prolonged strenuous exercise would increase the blood glucose concentration toward the end of exercise. Six trained cyclists pedaled on a cycle ergometer at 65-70%
D.E. Thomas and J. Brand Miller are with the Human Numtion Unit, Department of Biochemistry, University of Sydney, N.S.W. 2006, Australia. J.R. Brotherhood is with the National Occupational Health and Safety Commission (Worksafe), P.O. Box 58, Sydney, N.S.W. 2001, Australia.