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1 Exercise Physiology Laboratory, Department of Integrative Biology, University of California, Berkeley, CA, USA
* To whom correspondence should be addressed. E-mail: gbrooks{at}socrates.berkeley.edu.
To evaluate the hypothesis that lipid oxidation predominates in postexercise recovery, we examined healthy men (n = 6; age = 21.2 ± 0.6 yr) and women (n = 6; age = 22.8 ± 2.1 y) during and after two exercise tasks [89 min @ 45% and 60 min @ 65% of peak rate of oxygen consumption (VO2peak)] as well as a time-matched resting control trial (Con). Exercise bouts were matched for energy expenditure. Respiratory exchange ratios (RER) during exercise @ 65% VO2peak for both men and women (0.95±0.01 and 0.93±0.02) were significantly higher than 45% VO2peak (0.89±0.01 and 0.86±0.02) and Con trials (0.86±0.01 and 0.86±0.02, respectively). During recovery, for men RER values were 0.78±0.01 and 0.76±0.01 after 45% and 65% exercise, respectively. For women, values were 0.79±0.01 and 0.78±0.01. These were significantly lower than during both the pre-exercise resting period and the corresponding no-exercise Con period (0.82±0.01 and 0.83±0.01, mean RER for men and women, respectively). Hence, the contribution of lipid oxidation to energy supply increased significantly during recovery compared to pre-exercise levels, and was greater after exercise than during the time-matched, no-exercise Con period. It is concluded that while carbohydrate is the major fuel source during moderate to high intensity exercise: (1) there is substantial postexercise lipid oxidation; and (2) lipid oxidation is the same during postexercise recovery whether the relative power output is 45% or 65% of VO2peak when energy expenditure of exercise is matched.
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