Effects of a Carbohydrate-, Protein-, and Ribose-Containing Repletion Drink During 8 Weeks of Endurance Training on Aerobic Capacity, Endurance Performance, and Body Composition

• Autores: Joel T. Cramer, Terry J. Housh, Glen O. Johnson, Jared W. Coburn, Jeffrey R. Stout
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 26, Nº. 8, 2012, págs. 2234-2242
• Idioma: inglés
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• Resumen

  • This study compared a carbohydrate-, protein-, and ribose-containing repletion drink vs. carbohydrates alone during 8 weeks of aerobic training. Thirty-two men (age, mean ± SD = 23 ± 3 years) performed tests for aerobic capacity (V[Combining Dot Above]O2peak), time to exhaustion (TTE) at 90% V[Combining Dot Above]O2peak, and percent body fat (%fat), and fat-free mass (FFM). Testing was conducted at pre-training (PRE), mid-training at 3 weeks (MID3), mid-training at 6 weeks (MID6), and post-training (POST). Cycle ergometry training was performed at 70% V[Combining Dot Above]O2peak for 1 hours per day, 5 days per week for 8 weeks. Participants were assigned to a test drink (TEST; 370 kcal, 76 g carbohydrate, 14 g protein, 2.2 g d-ribose; n = 15) or control drink (CON; 370 kcal, 93 g carbohydrate; n = 17) ingested immediately after training. Body weight (BW; 1.8% decrease CON; 1.3% decrease TEST from PRE to POST), %fat (5.5% decrease CON; 3.9% decrease TEST), and FFM (0.1% decrease CON; 0.6% decrease TEST) decreased (p <= 0.05), whereas V[Combining Dot Above]O2peak (19.1% increase CON; 15.8% increase TEST) and TTE (239.1% increase CON; 377.3% increase TEST) increased (p <= 0.05) throughout the 8 weeks of training. Percent decreases in %fat from PRE to MID3 and percent increases in FFM from PRE to MID3 and MID6 were greater (p <= 0.05) for TEST than CON. Overall, even though the TEST drink did not augment BW, V[Combining Dot Above]O2peak, or TTE beyond carbohydrates alone, it did improve body composition (%fat and FFM) within the first 3�6 weeks of supplementation, which may be helpful for practitioners to understand how carbohydrate-protein recovery drinks can and cannot improve performance in their athletes.