Effects of food bar chewing duration on the physiologic, metabolic, and perceptual responses to moderate-intensity running.

Autor: Geaney TR; Human Performance Laboratory, School of Exercise Science, College of Health Sciences, Old Dominion University, Norfolk, VA, 23529, USA., Sievert ZA; Department of Rehabilitation, Exercise and Nutrition Sciences, College of Allied Health Sciences, University of Cincinnati, Cincinnati, OH, 45221, USA., Branch JD; Human Performance Laboratory, School of Exercise Science, College of Health Sciences, Old Dominion University, Norfolk, VA, 23529, USA., Wilson PB; Human Performance Laboratory, School of Exercise Science, College of Health Sciences, Old Dominion University, Norfolk, VA, 23529, USA. pbwilson@odu.edu.
Jazyk: angličtina
Zdroj: European journal of applied physiology [Eur J Appl Physiol] 2024 Oct; Vol. 124 (10), pp. 3125-3133. Date of Electronic Publication: 2024 Jun 03.
DOI: 10.1007/s00421-024-05521-3
Abstrakt: Purpose: Chewing duration can affect food particle size, gastric processing, and postprandial glycemia, but these effects have not been investigated with exercise. This study examined how the chewing duration of a food bar impacts glycemic and metabolic responses, gastrointestinal (GI) symptoms, psychological affect, and performance during endurance running.
Methods: This randomized, unblinded, crossover study had 15 males (35.2 ± 7.4 years, VO 2peak : 56.1 ± 5.2 ml/kg/min) attend three laboratory visits. Visit 1 required a VO 2peak test, 10 min familiarization run at 60% VO 2peak , and familiarization time-to-exhaustion (TTE) test (10 min at 90% VO 2peak , followed by TTE at 100% VO 2peak ). Visits 2 and 3 consisted of a 60 min run at 60% VO 2peak , followed by TTE testing. Participants were fed 45 g of a bar (180 kcal, 4 g fat, 33 g carbohydrate, 3 g protein, 1 g fiber) in 9 g servings 30 min before running, and 27 g of bar in 9 g servings at three timepoints during the 60 min run. Participants consumed the servings in 20 (20CHEW) or 40 (40CHEW) masticatory cycles, at 1 chew/second. Outcomes included blood glucose, substrate use, GI symptoms, perceived exertion (RPE), overall feeling, and TTE.
Results: Post-prandial blood glucose, GI symptoms, and RPE increased over time, but there were no significant between-condition or condition-by-time effects. TTE showed no significant between-condition effect (20CHEW: 288 ± 133 s; 40CHEW: 335 ± 299 s; p = 0.240). Overall feeling demonstrated a time-by-condition effect (p = 0.006), suggesting possible better maintenance over time with 40CHEW.
Conclusion: Cumulatively, the results suggest that extended chewing minimally impacts physiology, perceptions, and performance during 60 min moderate-intensity running.
(© 2024. The Author(s).)
Databáze: MEDLINE
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