Journal
APPLIED PHYSIOLOGY NUTRITION AND METABOLISM
Volume 41, Issue 7, Pages 719-727Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/apnm-2015-0526
Keywords
nighttime feeding; pre-sleep nutrition; chocolate milk; metabolism; post-prandial; hydration; performance; female
Categories
Funding
- Institute of Sport Sciences and Medicine at Florida State University
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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 years; peak oxygen consumption, 53 +/- 4 mL.kg(-1).min(-1)) randomly ingested either pre-sleep CM or non-nutritive placebo (PL) similar to 30 min before sleep and 7-9 h 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% peak oxygen consumption, and a 10-km treadmill time trial (TT). Physiological responses were assessed prior, during (incremental and TT), and postexercise. 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.
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