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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Article info
Publication history
Published online: January 14, 2013
Accepted:
December 10,
2012
Received:
August 12,
2012
Identification
Copyright
© 2013 Elsevier Inc. Published by Elsevier Inc. All rights reserved.
