The purpose of the present study was to investigate if oral ingestion of a specific maltodextrin and whey protein combination in the form of sago and soy protein at every 20 minute intervals during steady-state exercise at 60% of VO2max can improve the high intensity cycling performance at 90% VO2max as compared to a specific maltodextrin, sago and placebo. The participants of the present study were 8 male recreational cyclists with age, weight and VO2 max of 21.5 ± 1.1 years, 63.3 ± 2.4 kg, and 39.9 ± 1.1 mL.kg-1.min-1, respectively. The design of the study was a randomized, double-blind placebo controlled crossover, comprising of 60 min of exercise on a cycle ergometer at 60 % VO2 max followed by a ride to exhaustion at 90 % VO2 max. Subjects ingested sago, sago soy or placebo before exercise and at 20 min intervals during exercise. The time to exhaustion at high intensity cycling performance for the placebo, sago and sago soy were 4.086 ± 0.452 minutes, 5.486 ± 0.424 minutes, and 7.525 ± 0.715 minutes (Mean ± SEM), respectively. One way ANOVA followed by Scheffe post hoc test revealed that the sago soy supplementation resulted in a significantly longer mean cycling time (p < 0.05) than that of the sao and placebo supplementation. Two way repeated measure linear model ANOVA exhibited increased levels of plasma glucose and insulin during sago and sago soy supplementation as compared to the placebo supplementation. Hence, we conclude that combination of a maltodextrin and whey protein in the form of sago and soy protein, during a steady state cyling, can improve the subsequent high intensity endurance cycling performance at 90% VO2 max.
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