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Article

Pre-Sleep Low Glycemic Index Modified Starch Does Not Improve Next-Morning Fuel Selection or Running Performance in Male and Female Endurance Athletes

1
Health and Human Physiological Sciences, Skidmore College, Saratoga Springs, NY 12866, USA
2
Department of Nutrition, Food, and Exercise Sciences, Institute of Sport Sciences and Medicine, Florida State University, Tallahassee, FL 32306, USA
3
Department of Biokinetics, Exercise and Leisure Sciences, School of Health Sciences, University of KwaZulu-Natal, Durban 4041, South Africa
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(9), 2888; https://doi.org/10.3390/nu12092888
Received: 30 August 2020 / Revised: 16 September 2020 / Accepted: 17 September 2020 / Published: 22 September 2020
(This article belongs to the Special Issue Nutrition and Athletic Performance)
To determine the effects of pre-sleep supplementation with a novel low glycemic index (LGI) carbohydrate (CHO) on next-morning substrate utilization, gastrointestinal distress (GID), and endurance running performance (5-km time-trial, TT). Using a double-blind, randomized, placebo (PLA) controlled, crossover design, trained participants (n = 14; 28 ± 9 years, 8/6 male/female, 55 ± 7 mL/kg/min) consumed a LGI, high glycemic index (HGI), or 0 kcal PLA supplement ≥ 2 h after their last meal and <30 min prior to sleep. Upon arrival, resting energy expenditure (REE), substrate utilization, blood glucose, satiety, and GID were assessed. An incremental exercise test (IET) was performed at 55, 65, and 75% peak volume of oxygen consumption (VO2peak) with GID, rating of perceived exertion (RPE) and substrate utilization recorded each stage. Finally, participants completed the 5-km TT. There were no differences in any baseline measure. During IET, CHO utilization tended to be greater with LGI (PLA, 56 ± 11; HGI, 60 ± 14; LGI, 63 ± 14%, p = 0.16, η2 = 0.14). GID was unaffected by supplementation at any point (p > 0.05). Performance was also unaffected by supplement (PLA, 21.6 ± 9.5; HGI, 23.0 ± 7.8; LGI, 24.1 ± 4.5 min, p = 0.94, η2 = 0.01). Pre-sleep CHO supplementation did not affect next-morning resting metabolism, BG, GID, or 5-km TT performance. The trend towards higher CHO utilization during IET after pre-sleep LGI, suggests that such supplementation increases morning CHO availability. View Full-Text
Keywords: exercise; carbohydrates; time trial; substrate utilization; fat oxidation; fatigue; gastrointestinal distress; satiety exercise; carbohydrates; time trial; substrate utilization; fat oxidation; fatigue; gastrointestinal distress; satiety
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MDPI and ACS Style

Dudar, M.D.; Bode, E.D.; Fishkin, K.R.; Brown, R.A.; Carre, M.M.; Mills, N.R.; Ormsbee, M.J.; Ives, S.J. Pre-Sleep Low Glycemic Index Modified Starch Does Not Improve Next-Morning Fuel Selection or Running Performance in Male and Female Endurance Athletes. Nutrients 2020, 12, 2888. https://doi.org/10.3390/nu12092888

AMA Style

Dudar MD, Bode ED, Fishkin KR, Brown RA, Carre MM, Mills NR, Ormsbee MJ, Ives SJ. Pre-Sleep Low Glycemic Index Modified Starch Does Not Improve Next-Morning Fuel Selection or Running Performance in Male and Female Endurance Athletes. Nutrients. 2020; 12(9):2888. https://doi.org/10.3390/nu12092888

Chicago/Turabian Style

Dudar, Monique D., Emilie D. Bode, Karly R. Fishkin, Rochelle A. Brown, Madeleine M. Carre, Noa R. Mills, Michael J. Ormsbee, and Stephen J. Ives 2020. "Pre-Sleep Low Glycemic Index Modified Starch Does Not Improve Next-Morning Fuel Selection or Running Performance in Male and Female Endurance Athletes" Nutrients 12, no. 9: 2888. https://doi.org/10.3390/nu12092888

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