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Slater, T. 
ORCID: 0000-0003-2764-3148, Mode, W.J.A. ORCID: 0000-0003-4667-2876, Pinkney, M.G., Hough, J. ORCID: 0000-0001-6970-5779, James, R.M. ORCID: 0000-0002-7119-3159, Sale, C., James, L.J. and Clayton, D.J. ORCID: 0000-0001-5481-0891,
2022.
Fasting before evening exercise reduces net energy intake and increases fat oxidation, but impairs performance in healthy males and females.
International Journal of Sport Nutrition and Exercise Metabolism.
ISSN 1526-484X
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Abstract
Acute morning fasted exercise may create a greater negative 24-hr energy balance than the same exercise performed after a meal, but research exploring fasted evening exercise is limited. This study assessed the effects of 7-hr fasting before evening exercise on energy intake, metabolism, and performance. Sixteen healthy males and females (n = 8 each) completed two randomized, counterbalanced trials. Participants consumed a standardized breakfast (08:30) and lunch (11:30). Two hours before exercise (16:30), participants consumed a meal (543 ± 86 kcal; FED) or remained fasted (FAST). Exercise involved 30-min cycling (∼60% VO2peak) and a 15-min performance test (∼85% VO2peak; 18:30). Ad libitum energy intake was assessed 15 min postexercise. Subjective appetite was measured throughout. Energy intake was 99 ± 162 kcal greater postexercise (p < .05), but 443 ± 128 kcal lower over the day (p < .001) in FAST. Appetite was elevated between the preexercise meal and ad libitum meal in FAST (p < .001), with no further differences (p ≥ .458). Fat oxidation was greater (+3.25 ± 1.99 g), and carbohydrate oxidation was lower (−9.16 ± 5.80 g) during exercise in FAST (p < .001). Exercise performance was 3.8% lower in FAST (153 ± 57 kJ vs. 159 ± 58 kJ, p < .05), with preexercise motivation, energy, readiness, and postexercise enjoyment also lower in FAST (p < .01). Fasted evening exercise reduced net energy intake and increased fat oxidation compared to exercise performed 2 hr after a meal. However, fasting also reduced voluntary performance, motivation, and exercise enjoyment. Future studies are needed to examine the long-term effects of this intervention as a weight management strategy.
| Item Type: | Journal article | ||||||
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| Publication Title: | International Journal of Sport Nutrition and Exercise Metabolism | ||||||
| Creators: | Slater, T., Mode, W.J.A., Pinkney, M.G., Hough, J., James, R.M., Sale, C., James, L.J. and Clayton, D.J. | ||||||
| Publisher: | Human Kinetics | ||||||
| Date: | 28 September 2022 | ||||||
| ISSN: | 1526-484X | ||||||
| Identifiers: |
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| Rights: | Accepted author manuscript version reprinted, by permission, from International Journal of Sport Nutrition and Exercise Metabolism, 2022, https://doi.org/10.1123/ijsnem.2022-0132 © Human Kinetics, Inc. | ||||||
| Divisions: | Schools > School of Science and Technology | ||||||
| Record created by: | Laura Ward | ||||||
| Date Added: | 29 Sep 2022 14:23 | ||||||
| Last Modified: | 29 Sep 2022 14:23 | ||||||
| URI: | https://irep.ntu.ac.uk/id/eprint/47159 |
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