At-home bodyweight interval exercise in the fed versus fasted state lowers postprandial glycemia and appetite perceptions in females.

Abstract

Limited research has characterized the metabolic health benefits of bodyweight interval exercise (BWE) performed outside of a laboratory setting. Metabolic responses to exercise can also be influenced by meal timing around exercise, but the interactive effects of BWE and nutrition are unknown. This study investigated the effects of BWE performed in the fasted or fed state on postprandial glycemia, post-exercise fat oxidation and appetite perceptions. Twelve females (23±2years; 22±2kg/m2) underwent two virtually-monitored trials that involved completing BWE (10 × 1 min, 1 min recovery) 5min before (FastEX) or beginning BWE 10min after (FedEX) a standardized breakfast. Heart rate and rating of perceived exertion (RPE) were measured during exercise and capillary glucose concentrations were measured for 2 h postprandial. Following exercise, appetite perceptions were assessed and Lumen expired carbon dioxide percentage (L%CO2) was measured as an index of fat oxidation. Heart rate (85±5%) and RPE (14±2) did not differ between conditions (p>0.05). Postprandial glucose mean (6.1±0.6vs. 6.8±0.8mmol/L, p=0.03), peak (7.4±1.2vs. 8.5±1.5mmol/L, p=0.01), and area under the curve (AUC) (758 ± 72vs. 973 ± 82mmol/L × 2 h, p=0.004) were lower in FedEX versus FastEX. Appetite perceptions were lower in FedEX versus FastEX (-87.63±58.51vs. -42.06±34.96mm, p=0.029). Post-exercise L%CO2 was transiently decreased 30min post-exercise in both conditions (4.03±0.38vs. 4.29±0.34%, p=0.0023), reflective of increased fat oxidation following BWE. These findings demonstrate that BWE performed in the fed compared to the fasted state lowered postprandial glycemia and appetite perceptions in females.