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Differences in whole-body fat oxidation kinetics between cycling and running

Chenevière, Xavier ; Malatesta, Davide ; Gojanovic, Boris ; Borrani, Fabio

In: European Journal of Applied Physiology, 2010, vol. 109, no. 6, p. 1037-1045

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    Title
    • Differences in whole-body fat oxidation kinetics between cycling and running
    Author
    • Chenevière, Xavier. Institute of Sport Sciences, University of Lausanne (ISSUL), Bâtiment de Vidy, 1015, Lausanne, Switzerland
    • Malatesta, Davide. Institute of Sport Sciences, University of Lausanne (ISSUL), Bâtiment de Vidy, 1015, Lausanne, Switzerland
    • Gojanovic, Boris. Department of Locomotion, CHUV, Lausanne, Switzerland
    • Borrani, Fabio. Institute of Sport Sciences, University of Lausanne (ISSUL), Bâtiment de Vidy, 1015, Lausanne, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • European Journal of Applied Physiology, 2010, vol. 109, no. 6, p. 1037-1045. Springer-Verlag
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:310501
    Summary
    This study aimed to quantitatively describe and compare whole-body fat oxidation kinetics in cycling and running using a sinusoidal mathematical model (SIN). Thirteen moderately trained individuals (7 men and 6 women) performed two graded exercise tests, with 3-min stages and 1kmh−1 (or 20W) increment, on a treadmill and on a cycle ergometer. Fat oxidation rates were determined using indirect calorimetry and plotted as a function of exercise intensity. The SIN model, which includes three independent variables (dilatation, symmetry and translation) that account for main quantitative characteristics of kinetics, provided a mathematical description of fat oxidation kinetics and allowed for determination of the intensity (Fatmax) that elicits maximal fat oxidation (MFO). While the mean fat oxidation kinetics in cycling formed a symmetric parabolic curve, the mean kinetics during running was characterized by a greater dilatation (i.e., widening of the curve, P<0.001) and a rightward asymmetry (i.e., shift of the peak of the curve to higher intensities, P=0.01). Fatmax was significantly higher in running compared with cycling (P<0.001), whereas MFO was not significantly different between modes of exercise (P=0.36). This study showed that the whole-body fat oxidation kinetics during running was characterized by a greater dilatation and a rightward asymmetry compared with cycling. The greater dilatation may be mainly related to the larger muscle mass involved in running while the rightward asymmetry may be induced by the specific type of muscle contraction