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.


Jammer dat uit het abstract niet naar voren komt hoe de voeding er uit zag voor de verschillende groepen.

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