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Ormsbee MJ, Gorman KA, Miller EA, Baur DA, Eckel LA, Contreras RJ, Panton LB, Spicer MT. Nighttime feeding likely alters morning metabolism but not exercise performance in female athletes. Appl Physiol Nutr Metab 2016; 41:719-27. [PMID: 27329516 DOI: 10.1139/apnm-2015-0526] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
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) ∼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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Affiliation(s)
- Michael J Ormsbee
- a Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA.,b Discipline of Biokinetics, Exercise, and Leisure Studies, University of KwaZulu-Natal, Durban 4000, South Africa
| | - Katherine A Gorman
- a Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA
| | - Elizabeth A Miller
- a Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA
| | - Daniel A Baur
- a Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA
| | - Lisa A Eckel
- c Department of Psychology and Neuroscience, Florida State University, Tallahassee, FL 32306, USA
| | - Robert J Contreras
- c Department of Psychology and Neuroscience, Florida State University, Tallahassee, FL 32306, USA
| | - Lynn B Panton
- a Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA
| | - Maria T Spicer
- a Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA
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Oswald H, Sharkey M, Pade D, Martinez MN. Canine gastrointestinal physiology: Breeds variations that can influence drug absorption. Eur J Pharm Biopharm 2015; 97:192-203. [DOI: 10.1016/j.ejpb.2015.09.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 08/01/2015] [Accepted: 09/20/2015] [Indexed: 12/12/2022]
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