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Effect of Time of a Day on EPOC Magnitude and Duration:

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Medicine & Science in Sports & Exercise:Volume 39(5) SupplementMay 2007p S55

Effect of Time of a Day on EPOC Magnitude and Duration: Lee, Chia-Ling; Mikat, Richard P. FACSM; Udermann, Brian E. FACSM; Skemp-Arlt, Karen M.

University of Wisconsin La Crosse, La Crosse, WI

There is considerable interest in the effect of time-of-day on the caloric cost of exercise. An important component of the caloric cost of exercise is recovery.

PURPOSE: Because little is known about recovery energy costs at different times of day, the purpose of this study was to examine the effect of time-of-day on Excess Post-Exercise Oxygen Consumption (EPOC) magnitude and duration following a 30-minute bout of moderate-intensity cycling.

METHODS: Sixteen moderate to high aerobically trained women (mean age=21*4 years) volunteered as participants for this study. Each subject performed three-30 minute bouts of exercise on a cycle ergometer at 65% of their age-predicted maximum heart rate. These bouts were separated by at least two days and were randomly ordered for early morning (05:00-07:00), mid-day (11:00-13:00), and early evening (17:00-19:00). Following each exercise bout, subjects rested while their post-exercise oxygen consumption rates were measured by indirect caloricity for 30 minutes. Time and magnitude of EPOC were calculated from this data and were analyzed with repeated measures ANOVA.

RESUITS: There were no statistically significant differences (p=0.109) between mean durations of EPOC for morning (16.19*4.14 minutes), mid-day (13.94*2.68 minutes) and evening (16.98*4.33 minutes). There were; however; significant differences (p=.013) in EPOC magnitude for morning (14.10*4.61 ml O2/kg), mid-day (20.25*9.74 ml O2/kg) and evening (22.90*7.45 ml O2/kg). Post-hoc analyses indicated that morning EPOC magnitude was significantly less than evening EPOC magnitude (p=.011) and that magnitudes at other times of day did not differ significantly from each other.

CONCLUSIONS: While the duration of EPOC did not appear to be effected by time-of-day, the magnitude of EPOC appeared to increase as tests were performed later in the day. These results suggest that exercise later versus earlier may require greater recovery energy consumption.

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