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Ingestion of carbohydrate or carbohydrate plus protein does not enhance performance during endurance exercise: a randomized crossover placebo-controlled clinical trial.
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- Author(s): Finger, Débora; Lanferdini, Fábio Juner; Farinha, Juliano Boufleur; Brusco, Clarissa Müller; Helal, Lucas; Boeno, Francesco Pinto; Cadore, Eduardo Lusa; Pinto, Ronei Silveira
- Source:
Applied Physiology, Nutrition & Metabolism; 2018, Vol. 43 Issue 9, p937-944, 8p, 1 Diagram, 3 Charts, 3 Graphs- Subject Terms:
TORQUE; ATHLETIC ability; CLINICAL trials; CROSSOVER trials; CYCLING; DIETARY supplements; CARBOHYDRATE content of food; PHYSICAL fitness; DIETARY proteins; RUNNING; STATISTICAL sampling; TIME; EFFECT sizes (Statistics); COOLDOWN; RANDOMIZED controlled trials; PRE-tests & post-tests; DESCRIPTIVE statistics - Source:
- Additional Information
- Abstract: A beverage containing protein (PRO) and carbohydrate (CHO) may have an ergogenic effect on endurance performance. However, evidence regarding its efficacy on similar conditions to athletes’ race day is still lacking. The objective of this study was to compare the effects of 3 different nutritional supplementation strategies on performance and muscle recovery in a duathlon protocol. Thirteen male athletes (29.7 ± 7.7 years) participated in 3 simulated Olympic-distance duathlon trials (SDTs) under 3 different, randomly assigned supplementation regimens: CHO drink (75 g CHO), isocaloric CHO plus PRO drink (60.5 g CHO and 14.5 g PRO), and placebo drink (PLA). Supplements were offered during the cycling bout. Blood samples were collected before, immediately after, and 24 h after each SDT for creatine kinase (CK) analysis. Isometric peak torque (PT) was measured before and 24 h after each SDT. The primary outcome measure was the time to complete the 5-km running section (t
5km ) at a self-selected pace. There was no difference in t5km between CHO (1270.3 ± 130.5 s), CHO+PRO (1267.2 ± 138.9 s), and PLA (1275.4 ± 120 s); p = 0.87, effect size (ES) ≤ 0.1. Pre–post changes for PT and CK were not significant for any of the 3 conditions (PT: p = 0.24, ES ≤ 0.4; CK: p = 0.32, ES = 0.3–1.04). For endurance sports lasting up to 2 h, with a pre-exercise meal containing CHO at 1.5 g·kg−1, supplementation with CHO or CHO+PRO does not offer additional benefits for performance and muscle recovery when compared with PLA. [ABSTRACT FROM AUTHOR] - Abstract: Une boisson contenant des protéines (« PRO ») et des sucres (« CHO ») pourrait procurer un bénéfice ergogène lors d’un exercice d’endurance. Toutefois, il n’y a pas encore de données probantes au sujet de l’efficacité d’une telle boisson dans des conditions similaires à celles du jour de la compétition sportive. Cette étude a pour objectif de comparer l’effet de trois stratégies de supplémentation nutritive sur la performance et la récupération musculaire dans un protocole de duathlon. Treize athlètes masculins (29,7 ± 7,7 ans) participent à trois simulations de duathlon olympique dans trois conditions de supplémentation appliquées aléatoirement durant la phase à vélo : boisson sucrée (CHO, 75 g), boisson isocalorique CHO+PRO (CHO : 60,5 g + PRO : 14,5 g) et placebo (« PLA »). Avant, immédiatement après chaque test et 24 h plus tard, on prélève des échantillons de sang pour en analyser la teneur en créatine kinase (« CK »). Avant et 24 h après chaque condition, on évalue le moment de force isométrique de pointe (« PT »). Le principal résultat est le temps de performance à la dernière phase de 5 km à la course (« t
5km ») selon un rhythme de course autodéterminé. Il n’y a pas de différence de t5km entre CHO (1270,3 ± 130,5 s), CHO+PRO (1267,2 ± 138,9 s) et PLA (1275,4 ± 120 s); p = 0,87; ampleur de l’effet (AE) ≤ 0,1. On n’observe pas de différence significative pré–post de PT et CK dans les trois conditions (PT : p = 0,24, AE ≤ 0,41; CK : p = 0,32, AE = 0,3–1,04). Dans une compétition sportive d’endurance pouvant durer jusqu’à 2 h et incluant préalablement un repas renfermant 1,5 g/kg de CHO, un supplément de CHO ou CHO+PRO ne procure pas de gains additionnels sur le plan de la performance et de la récupération musculaire comparativement à un placebo. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Applied Physiology, Nutrition & Metabolism is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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