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Post-exercise fat oxidation: effect of exercise duration, intensity and modality

journal contribution
posted on 2023-05-17, 01:09 authored by Warren, AE, Howden, EJ, Andrew WilliamsAndrew Williams, James Fell, Johnson, NA
Postexercise fat oxidation may be important for exercise prescription aimed at optimizing fat loss. The authors examined the effects of exercise intensity, duration, and modality on postexercise oxygen consumption (VO2) and substrate selection/respiratory-exchange ratio (RER) in healthy individuals. Three experiments (n = 7 for each) compared (a) short- (SD) vs. long-duration (LD) ergometer cycling exercise (30 min vs. 90 min) matched for intensity, (b) low- (LI) vs. high-intensity (HI) cycling (50% vs. 85% of VO2max) matched for energy expenditure, and (c) continuous (CON) vs.interval (INT) cycling matched for energy expenditure and mean intensity. All experiments were administered by crossover design. Altering exercise duration did not affect postexercise VO2 or RER kinetics (p >.05). However, RER was lower and fat oxidation was higher during the postexercise period in LD vs. SD (p < .05). HI vs. LI resulted in a significant increase in total postexercise energy expenditure and fat oxidation (p < .01). Altering exercise modality (CON vs. INT) did not affect postexercise VO2, RER, or fat oxidation (p > .05). These results demonstrate that postexercise energy expenditure and fat oxidation can be augmented by increasing exercise intensity, but these benefits cannot be exploited by undertaking interval exercise (1:2-min work:recovery ratio) when total energy expenditure, duration, and mean intensity remain unchanged. In spite of the apparent benefit of these strategies, the amount of fat oxidized after exercise may be inconsequential compared with that oxidized during the exercise bout.

History

Publication title

International Journal of Sports Nutrition and Exercise Metabolism

Volume

19

Issue

6

Pagination

607-623

ISSN

1526-484X

Department/School

School of Health Sciences

Publisher

Human Kinetics

Place of publication

USA

Rights statement

Copyright © 2009 Human Kinetics, Inc.

Repository Status

  • Restricted

Socio-economic Objectives

Clinical health not elsewhere classified

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