Energy Intake Over Two Days is Unaffected by Acute Spring Interval Exercise Despite Increased Appetite and Energy Expenditure
Abstract
A cumulative effect of increased post-exercise oxygen consumption (V̇O2), lipid oxidation and/or reduced energy intake (EI) may explain the fat loss associated with sprint interval exercise (SIE) training. The purpose of this study was to assess the effects of SIE on EI, appetite ratings and peptides, V̇O2, and substrate oxidation (RER). Eight men completed 2 treatments, consisting of consecutive 10-h trials: SIE/recovery (SIEx), and no exercise control (NoEx). Immediate post-exercise suppression of appetite and increase in peptide YY were observed during SIEx. Despite this, overall treatment appetite was greater with SIEx but this did not affect total EI. RER was lower ~6 h post-exercise and total V̇O2 was greater during SIEx vs NoEx. Compared with no exercise control, SIE increases daily energy expenditure but energy intake is unaffected at least acutely. SIE-induced increases in both energy expenditure and lipid oxidation may explain the fat loss associated with this training modality.