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Effects of post-absorptive and postprandial exercise on 24h fat oxidation

Published:January 14, 2013DOI:https://doi.org/10.1016/j.metabol.2012.12.008

      Abstract

      Objective

      Fat oxidation during exercise depends on nutritional state, and exercise performed in the post-absorptive state oxidizes more fat than that performed in the postprandial state. However, the effects of exercise on energy metabolism continue during the post-exercise period, and the difference in fat oxidation during exercise may be compensated for during the post-exercise period. The present study compared the effects of an acute exercise bout in the post-absorptive or postprandial state on 24 h fat oxidation.

      Methods

      Twelve young male athletes stayed twice in a room-size metabolic chamber for 24 h indirect calorimetry in a randomized repeated-measure design. Before or after breakfast, i.e. in the post-absorptive or postprandial state, subjects exercised at 50% VO2 max for 60 min.

      Results

      During the 60 min of exercise, energy expenditure in the two exercise trials were equivalent, but exercise in the post-absorptive state was performed with lower RQ compared with that in the postprandial state (P<0.01). The time of exercise relative to breakfast did not affect 24 h energy expenditure (P>0.5). However, accumulated 24 h fat oxidation was higher (P<0.05) and that of carbohydrate oxidation was lower (P<0.05) when exercise was performed in the post-absorptive state.

      Conclusions

      Compared with exercise performed in the postprandial state, exercise performed in the post-absorptive state oxidized more fat and saved more carbohydrate in the body, without affecting 24 h energy expenditure.

      Abbreviations:

      RQ (respiratory quotient), EPOC (excess post-exercise oxygen consumption), VO2 (oxygen consumption rate), VO2 (max (maximal oxygen uptake)), VCO2 (carbon dioxide production rate), N (urinary nitrogen excretion rate), MET (metabolic equivalent), W (watt)

      Keywords

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