McIver, V.J., Mattin, L.R., Evans, E.H and Yau. A.M.W 2025. The effect of morning or evening fasted cycling on gastrointestinal function and appetite and metabolic responses in healthy males with overweight. Experimental Physiology. Advanced online publication. https://doi.org/10.1113/EP092078
| Title | The effect of morning or evening fasted cycling on gastrointestinal function and appetite and metabolic responses in healthy males with overweight |
|---|---|
| Type | Journal article |
| Authors | McIver, V.J., Mattin, L.R., Evans, E.H and Yau. A.M.W |
| Abstract | Combining fasting with exercise may influence gastric emptying rate (GER) and provide benefits to weight management and metabolic health. Furthermore, the time of day in which exercise is performed may also influence these variables. The aim was to investigate if fasted or fed exercise at different times of the day would alter GER, appetite, and metabolic responses. Twelve males with overweight completed four experimental trials in a randomised crossover fashion involving cycling exercise in the morning fasted (FASTED-AM), evening fasted (FASTED-PM), and after a standardised meal in the morning (FED-AM) and evening (FED-PM). GER of a semi-solid meal was measured using the 13C-breath test for 2 h. Appetite hormones, metabolic markers, and subjective appetite were measured throughout with energy intake monitored for the following 24 h. No difference was observed for GER between trials. No differences were seen between trials for appetite hormone responses except pancreatic polypeptide hormone iAUC was greater in FED-PM compared to FASTED-AM and FASTED-PM (P<0.05). Glucose concentrations were greater in the postprandial period of FASTED-PM compared to all trials (P<0.05). No differences in other metabolic marker responses were seen between trials. GER in overweight individuals was not sensitive to a diurnal variation following fasted or fed exercise, and an acute bout of fasted exercise did not evoke compensatory effects on appetite responses or 24 h energy intake. Glucose control may be impaired with evening fasted exercise. Future work is required to assess the long-term impact of fasted exercise on gastrointestinal function, appetite regulation and metabolic health. |
| Keywords | Appetite |
| Overweight individuals | |
| Gastric emptying | |
| Diurnal variation | |
| Fasted exercise | |
| Metabolic responses | |
| Journal | Experimental Physiology |
| ISSN | 1469-445X |
| 0958-0670 | |
| Year | 2025 |
| Publisher | Wiley |
| Publisher's version | License CC BY 4.0 File Access Level Open (open metadata and files) |
| Digital Object Identifier (DOI) | https://doi.org/10.1113/EP092078 |
| Publication dates | |
| Published online | 11 Mar 2025 |
| Funder | The Physiological Society |