A-34 Free Communication/Poster - Energy Expenditure: JUNE 1, 2011 7:30 AM - 12:30 PM: ROOM: Hall B
The magnitude and duration of the elevation in resting energy expenditure following vigorous exercise have not been measured in a metabolic chamber.
PURPOSE: This study investigated the effects of a 47-min vigorous cycling bout on resting energy expenditure in comparison to rest during two days in a metabolic chamber.
METHODS: Ten male subjects (ages 22 to 33 yrs) completed two separate 24-h chamber visits (one rest and one exercise day) under isocaloric conditions. On the exercise day, subjects completed 47-min of cycling at 57% Wattsmax (mean±SD, 72.8±5.8% VO2max) starting at 11:00 am. Activities of daily living were tightly controlled to ensure uniformity on both rest and exercise days. The area under the energy expenditure curve for exercise and rest days was calculated using the trapezoid rule in the EXPAND procedure in the Statistical Analysis Systems (SAS) and then contrasted.
RESULTS: The 47-min exercise bout resulted in a net energy expenditure of 519±60.9 kcal (p<0.001). For the 18.7-h post-exercise period, energy expenditure was increased 223±86.9 kcal compared to the rest day (p<0.001). The net energy expenditure difference between exercise and rest days during sleep was 45.0±52.9 kcal (p=0.030).
CONCLUSIONS: In young male subjects, vigorous exercise for 47-min resulted in a significant elevation in post-exercise energy expenditure that persisted for 18.7-h. The 223 kcal expended post-exercise above resting levels represented 12% of the total oxygen consumed during the 47-min of cycling. The magnitude and duration of increased energy expenditure following a 47-min bout of vigorous exercise have important implications for weight loss and management.