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Nutrients | April 2. Browse Articles. Purpose: To examine the effects of commercially available sports beverages with various components on substrate metabolism and subsequent performance. Methods: Two studies were conducted in a double- blinded, counterbalanced manner. Study I was designed to determine the glycemic index, while study II determined the utilization of substrates and subsequent exercise performance. Ten healthy male participants (age 2. V̇O2max 4. 8. 1 ± 8. L/kg/min) participated in both study I and study II.
Three types of commercially available sports beverage powders were used. The powders consisted primarily of oligosaccharides (low molecular weight carbohydrates, L- CHO), hydrolyzed starch (high molecular weight CHO, H- CHO), and whey protein powder with carbohydrate (CHO- PRO). They were dissolved in purified water with identical CHO concentration of 8% (w/v).
In study I, each participant underwent two oral glucose tolerance tests (OGTT) and one glycemic response test for each sports drink. In study II, participants cycled for 6. V̇O2max, one hour after consuming a standardized breakfast. One of four prescribed beverages (L- CHO, H- CHO, CHO- PRO, and Placebo control, PLA) was served at 0, 1. Six hours after the first exercise session, participants came back for a “time to exhaustion test” (TTE). Blood samples were drawn at 0, 3. Subjective feelings (rating of perceived exertion and abdominal discomfort) were also evaluated every 3.
Results: Compared to the reference standardized glucose solution, the glycemic index of the L- CHO beverage was 1. H- CHO was 1. 05. CHO- PRO was 6. 7. During the exercise test, the insulin level at 3.
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L- CHO, H- CHO, and PLA (p < 0. The CHO oxidation rate at 6. L- CHO treatment (p < 0.
Time to exhaustion was not significantly different (p > 0. Conclusion: The CHO sports beverage with additional PRO maintains insulin production during endurance cycling at 7. V̇O2max in the postprandial state.
L- CHO sports beverage suppresses fat utilization during the subsequent exercise performance test. The subsequent exercise performance (as evaluated by TTE) was not influenced by the type of CHO or the addition of PRO in the commercially available sports beverages used in the present study.
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