Il y a plus de glucides disponibles pour l'entraînement matinal ce qui aurait été bénéfique pour la musculation
NIGHTTIME FEEDING LIKELY ALTERS MORNING METABOLISM BUT NOT EXERCISE PERFORMANCE IN FEMALE ATHLETES
Michael J Ormsbee Applied Physiology, Nutrition, and Metabolism 02 March 2016.
The timing of morning endurance competition may limit proper pre-race fueling and resulting performance. A nighttime, pre-sleep nutritional strategy could be an alternative method to target the metabolic and hydrating needs of the early morning athlete without compromising sleep or gastrointestinal comfort during exercise. Therefore, the purpose of this investigation was to examine the acute effects of pre-sleep chocolate milk (CM) ingestion on next morning running performance, metabolism, and hydration status.
Twelve competitive female runners and triathletes (age, 30 ± 7 yrs; VO2peak, 53 ± 4 ml·kg−1·min−1) randomly ingested either pre-sleep CM or non-nutritive placebo (PL) ~30 min before sleep and 7-9 hrs before a morning exercise trial. Resting metabolic rate (RMR) was assessed prior to exercise. The exercise trial included a warm-up, three 5-min incremental workloads at 55, 65, and 75% VO2peak, and a 10-km treadmill time trial (TT). Physiological responses were assessed prior, during (incremental and TT), and post-exercise. Paired t-tests and magnitude-based inferences were used to determine treatment differences. TT performances were not different (‘most likely trivial’ improvement with CM) between conditions (PL: 52.8 ± 8.4 min vs CM: 52.8 ± 8.0 min). RMR was ‘likely’ increased (4.8%) and total carbohydrate oxidation (g·min−1) during exercise was ‘possibly’ or ‘likely’ increased (18.8%, 10.1%, 9.1% for stage 1-3 respectively) with CM versus PL. There were no consistent changes to hydration indices. In conclusion, pre-sleep CM may alter next morning resting and exercise metabolism to favor carbohydrate oxidation, but effects did not translate to 10-km running performance improvements.
