The effects of a pre-exercise meal on postexercise metabolism following a session of sprint interval training

Sprint interval training (SIT) has demonstrated reductions in fat mass through potential alterations in post-exercise metabolism. This study examined whether exercising in the fasted or fed state affects post-exercise metabolism following acute SIT. Ten active males performed a bout of modified SIT (8 x 15 s sprints; 120 s recovery) in both a fasted (FAST) and fed (FED) state. Gas exchange was collected through 3 h post-exercise, appetite perceptions were measured using a visual analog scale, and energy intake was recorded using dietary food logs. There was no difference in energy expenditure between conditions at any time point (p>0.329) or in total session energy expenditure (FED: 514.854.9 kcal, FAST: 504.074.3 kcal; p=0.982). Fat oxidation 3 h post-exercise was higher in FED (0.1100.04 gmin-1) versus FAST (0.0690.02 gmin-1; p=0.013) though not different between conditions across time (p>0.340), or in total post-exercise fat oxidation (FED: 0.1250.04 gmin-1>, FAST: 0.1050.02 gmin-1; p=0.154). Appetite perceptions were lower in FED (-4815.04098.7 mm) versus FAST (-707.52010.4 mm, p=0.022), however energy intake did not differ between conditions (p=0.429). These results demonstrate the fasted or fed state does not augment post-exercise metabolism following acute SIT in a way that would favour fat loss following training. • Energy expenditure was similar between conditions, while fat oxidation was significantly greater in FED at 3 h post-exercise • Appetite perceptions were significantly lower in FED, however energy intake was not different between conditions • Current findings suggest that performing SIT in the fed or fasted state would not affect fat loss following trainingThe accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author