Effect of fructose ingestion on muscle glycogen usage during exercise

Abstract

HARGREAVES, M., DAVID L. COSTILL, A. KATZ, and W.J. FINK. Effect of fructose ingestion on muscle glycogen usage during exercise. Med. Sci. Sports Exerc, Vol. 17, No. 3, pp. 360-363, 1985. Eight healthy males were studied to compare the effects of preexercise fructose and glucose ingestion on muscle glycogen usage during exercise. Subjects performed three randomly assigned trials, each involving 30 min of cycling exercise at 75% V˙O2max. Forty-five min prior to commencing each trial, subjects ingested either 50 g of glucose (G), 50 g of fructose (F), or sweet placebo (C). No differences in V˙O2or respiratory exchange ratio were observed between the trials. Blood glucose was elevated (P < 0.05..