Weight loss can be achieved by increasing energy expenditure (EE). EE depends on the calories expended during the bout of exercise as well as on the Excess Post-exercise Oxygen Consumption (EPOC). The impact of intensity and duration of exercise on EPOC has already been examined, but the impact of daily living activities has not yet been considered. PURPOSE The aim of this study was to evaluate the acute effects of moderate intensity cycling exercise (CE) and moderate to vigorous intensity daily living activities (DLA) on EPOC. METHODS 6 young moderately active female (age, 24,2±0,8 yr; BMI, 21,5±2,4 kg/m2; RMR, 1288±78,2 kcal/day; V O2peak, 41±7,2 ml/kg/min) participated in the study over a 2-week period. After having filled a Baecke questionnaire of habitual physical activity and having undergone a resting metabolic rate (RMR) measurement and an incremental test to exhaustion (V O2peak), subjects completed two bouts of 30 min of exercise separated by 48 hours of rest: a moderate intensity CE (60% of V O2peak) and moderate to vigorous DLA (3-6 METs). Before (30 min pre) and after (2 hours post) each exercise bout a RMR measurement was carried out in a sitting position (K4b2, Cosmed, Italy). A One-way ANOVA was used to analyse data and significance was accepted at p<0,05. RESULTS V O2 was significantly higher for CE during exercise when compared with DLA (CE 1,4±0,2 l/min; DLA 1,1±0,2 l/min; p<0,05). O2 consumed during and after CE was higher than DLA (not significantly) even when normalized to the pre-exercise levels (CE: O2tot 71,2±8,1 l; O2net 37,5±11,2 l; DLA: O2tot 64,1±9 l; O2net 29,57±10,9 l; ns). EPOC magnitude was also higher for CE than DLA, even not significantly (CE 3,3±2,5 l; DLA 2,6±1,4 l; ns). EPOC accounted for 9,5% and 9,2% of Total Energy Expenditure for CE and DLA respectively. There were no significant differences between groups for heart rate, respiratory exchange ratio, EE and energy source, although DLA exercise allowed a greater fat utilization during the 2-hour post exercise (CE 68,9±25 kcal; DLA 80,7±32 kcal; ns). CONCLUSION This study shows that 30 min of both protocols allowed an increase of EE for the first 2-hour after exercise. The equivalent EE during and after exercise between cycling and daily living activities underlines the importance of an active lifestyle, especially when weight loss is concerned.
- Daily living activities