Gastric emptying (GE) could influence exercise-induced changes in appetite and energy intake. GE also could contribute to changes in gastric symptoms and the availability of nutrients during exercise, which will subsequently affect performance.
The objective of this review was to determine the effects of acute exercise on GE using a systematic review and meta-analysis. The most common parameters to determine GE were selected, consisting of half-emptying time and volume emptied. Oral-caecal transit time (OCTT) was also examined.
Research databases (PubMed, Scopus, Google Scholar, EBSCOhost, SPORTDiscus) were searched through November 2013 for original studies, abstracts, theses and dissertations that examined the influence of acute exercise on GE.
Studies were included if they evaluated GE or OCTT during and/or after exercise and involved a resting control trial.
Study Appraisal and Synthesis
Initially, 195 studies were identified. After evaluation of study characteristics and quality and validity, data from 20 studies (35 trials) involving 221 participants (157 men; 52 women; 12 unknown) were extracted for meta-analysis. Random-effects meta-analyses were utilised for the three main outcome variables, and effect sizes (ES) are reported as Hedge’s g due to numerous small sample sizes.
Random-effects modelling revealed non-significant and small/null main effect sizes for volume emptied (ES = 0.195; 95 % CI −0.25 to 0.64), half-time (ES = −0.109, 95 % CI −0.66 to 0.44) and OCTT (ES = 0.089; 95 % CI −0.64 to 0.82). All analyses exhibited significant heterogeneity and numerous variables moderated the results. There was a dose response of exercise intensity; at lower intensities GE was faster, and at high exercise intensities GE was slower. Walking was associated with faster GE and cycling with slower GE. Greater volume of meal/fluid ingested, higher osmolality of beverage and longer exercise duration were also associated with slower GE with exercise.
The major limitation is that the majority of studies utilised a liquid bolus administered pre-exercise to determine GE; the relationship to post-exercise appetite and energy intake remains unknown. Study populations were also generally active or trained individuals. Furthermore, our review was limited to English language studies and studies that utilised resting control conditions.
These results suggest that exercise intensity, mode, duration and the nature of meal/fluid ingested all influence GE during and after acute exercise. The relationship of GE parameters with appetite regulation after exercise remains largely unexplored. Further integrative studies combining GE and alterations in gut hormones, as well as in populations such as overweight and obese individuals are needed.
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No sources of funding were used in the preparation of this manuscript. The authors have no conflicts of interest that are directly relevant to the content of this review. KH and MS conceived the study, conducted the literature review, extracted and reviewed the data, prepared the tables and wrote the initial manuscript. MS performed the meta-analysis and prepared the figures. All authors reviewed and approved the final manuscript.
K. M. Horner and M. M. Schubert contributed equally to this work.
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Horner, K.M., Schubert, M.M., Desbrow, B. et al. Acute Exercise and Gastric Emptying: A Meta-Analysis and Implications for Appetite Control. Sports Med 45, 659–678 (2015). https://doi.org/10.1007/s40279-014-0285-4
- Energy Intake
- Gastric Emptying
- Exercise Intensity
- Acute Exercise
- Exercise Duration