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Lack of sustained increase in oxygen consumption following exercise in fit and unfit subjects


, : Lack of sustained increase in oxygen consumption following exercise in fit and unfit subjects. American Journal of Clinical Nutrition 41(3): 545-549

Thermogenesis after exercise was studied by measuring O2 consumption [VO2] in 23 subjects who were classified into 3 groups according to their routine level of physical activity. VO2 was first measured after a 30-min rest period 4-h after breakfast. Then each subject either exercised for 20 min at approximately the anaerobic threshold, or, on a separate nonexercise day, remained recumbent. The subject then returned to, or remained, at rest. There was no significant difference in VO2 from the resting level from 40 min to 3 h after exercise, between exercise and nonexercise days, in any fitness group. Seven subjects also exercised for a longer period or at a higher intensity. Again, there was no significant difference in the time course of VO2 from 40-220 min after exercise, between exercise and nonexercise days. Because no sustained effect of moderate or intense exercise on VO2 was demonstrated, it is concluded that no appreciable caloric loss beyond that generated by the exercise period itself and the early recovery phase is found in either fit or unfit subjects. These data do not support claims for sustained increases in metabolic rate after exercise in weight-control programs.

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