It has been previously reported that EPOC of longer duration does not necessarily result in a greater caloric expenditure (Sedlock et al., MSSE, 1989
). This finding was based on a comparison of mean values for EPOC magnitude and duration following exercise of different combinations of intensity and duration. To date, there are no published reports in which EPOC magnitude and duration have been correlated among groups of subjects. This study analyzed data from four published studies from this laboratory to determine if a correlation exists between magnitude and duration of EPOC. For all studies, subjects refrained from strenuous exercise for a minimum of 24 hr prior to data collection. In one study subjects consumed a 355 kcal liquid meal 3 hr before testing, in three studies subjects fasted overnight. All testing was performed in the early morning. Subjects and exercise conditions were: 7 moderately trained young men who ran on a treadmill for 30 min at ∼65% V̇O2max; 5 endurance trained and 5 untrained young men who cycled at 50% V̇O2 max until expending 300 kcal; 8 untrained men and women who cycled for 20 min at 60% V̇O2 max; moderately active men (n=5) and women (n=6) who cycled at 70% V̇O2 max for 25 min. Correlation analyses between EPOC magnitude and duration yielded: r=.90, p<.006; r=.64, p<.04, r=.93, p<.001, r=.72, p<.01, respectively; and for all subjects (n=36) r=.74, p<.0001. In contrast to what has been previously reported, these data suggest that there is a positive relationship between EPOC magnitude and duration Additionally, this relationship seems to hold across a variety of exercise conditions, exercise modes, and subject populations.
American College of Sports Medicine; 46th Annual Meeting; Washington State; Convention & Trade Center; June 2-5, 1999
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F-28 POSTER EXERCISE & METABOLIC RATE