Fat oxidation rates are higher during running compared with cycling over a wide range of intensities

The aim of the present study was to compare the intensity that elicits maximal fat oxidation (Fatmax) determined using a cycle-ergometer and a treadmill-based protocol. Twelve moderately trained male subjects (66.9 ± 1.8 mL · kg−1 · min−1) performed 2 graded exercise tests to exhaustion. One test wa...

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Bibliographic Details
Published in:Metabolism, clinical and experimental clinical and experimental, 2003-06, Vol.52 (6), p.747-752
Main Authors: Achten, Juul, Venables, Michelle C, Jeukendrup, Asker E
Format: Article
Language:English
Subjects:
Adult
Bicycling - physiology
Biological and medical sciences
Chemical Phenomena
Chemistry
Cross-Over Studies
Exercise Test
Fundamental and applied biological sciences. Psychology
Heart Rate
Humans
Lipid Metabolism
Male
Mathematics
Oxidation-Reduction
Oxygen Consumption
Physical Endurance
Physical Exertion
Pulmonary Gas Exchange
Running - physiology
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Walking - physiology
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Summary:The aim of the present study was to compare the intensity that elicits maximal fat oxidation (Fatmax) determined using a cycle-ergometer and a treadmill-based protocol. Twelve moderately trained male subjects (66.9 ± 1.8 mL · kg−1 · min−1) performed 2 graded exercise tests to exhaustion. One test was performed on a cycle ergometer while 1 test was performed on a motorized treadmill; stage duration during both trials was 3 minutes. Gas exchange measurements and heart rate (HR) recordings were performed throughout exercise. Fat oxidation rates were calculated using stoichiometric equations. Maximal fat oxidation rates were significantly higher during running compared with cycling (0.65 ± 0.05 v 0.47 ± 0.05 g · min−1). However, the intensity, which elicited maximal fat oxidation, was not significantly different between the cycle ergometer and treadmill test (62.1 ± 3.1 v 59.2 ± 2.8% Vo2max, respectively). Fat oxidation rates were significantly higher during the treadmill test compared with the cycle ergometer test from 55 to 80%Vo2max. Maximal oxygen uptake and maximal HR were significantly higher during the treadmill test. It was concluded that fat oxidation rates were higher during walking compared with cycling. Maximal fat oxidation was 28% higher when walking compared with cycling, but the intensity, which elicits maximal fat oxidation, is not different between these 2 exercise modes.
ISSN:0026-0495
1532-8600
DOI:10.1016/S0026-0495(03)00068-4