Effects of carbohydrate intake on time to exhaustion and anaerobic contribution during supramaximal exercise

摘要

Objective: This study evaluated the effect of carbohydrate intake on time to exhaustion and anaerobic contribution during supramaximal exercise on a cycle ergometer. Methods: The sample comprised ten participants with a mean age of 23.9?±2.5 years, mean body mass of 75.1?±12.3 kg, mean height of 170.0?±1.0 cm, and mean body fat of 11.3?±5.2%. The participants underwent an incremental test to determine maximal oxygen uptake and maximum power output, and two supramaximal tests with a constant load of 110% of the maximum power output to exhaustion. Thirty minutes before the supramaximal tests the participants consumed carbohydrates (2 g.kg -1) or placebo. Results: The times to exhaustion of carbohydrate and placebo did not differ (carbohydrate: 170.7?±44.6s; placebo: 156.1?±26.7s, p =0.17; effect size=0.39). Similarly, the anaerobic contributions of the two treatments did not differ (carbohydrate: 3.0?±0.9 L; placebo: 2.7?±1.1 L, p =0.23; effect size=0.29). Conclusion: Carbohydrate intake was not capable of increasing time to exhaustion and anaerobic contribution in physically active men cycling at 110% of maximum power output.