Ingestion of carbohydrate or carbohydrate plus protein does not enhance performance during endurance exercise: a randomized crossover placebo-controlled clinical trial

Mar 16, 2018Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme

Carbohydrates or carbohydrates with protein do not improve endurance exercise performance

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Abstract

Thirteen male athletes completed 5-km running sections in an average time of 1270.3 seconds for carbohydrate-only supplementation, with no significant performance differences across three nutritional strategies.

No significant differences were found in completion times between carbohydrate (CHO), carbohydrate plus protein (CHO+PRO), and placebo (PLA) conditions.
Changes in muscle strength (isometric peak torque) and muscle damage markers (creatine kinase) were not significant across the three supplementation regimens.
Supplementation with CHO or CHO+PRO does not provide additional benefits for performance or muscle recovery compared to PLA for endurance events lasting up to 2 hours.

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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) at a self-selected pace. There was no difference in tbetween 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, supplementation with CHO or CHO+PRO does not offer additional benefits for performance and muscle recovery when compared with PLA. 5km5km -1

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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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