Document Detail

Differences in whole-body fat oxidation kinetics between cycling and running.
MedLine Citation:
PMID:  20358219     Owner:  NLM     Status:  MEDLINE    
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 1 km h(-1) (or 20 W) 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 (Fat(max)) 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). Fat(max) 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.
Xavier Chenevière; Davide Malatesta; Boris Gojanovic; Fabio Borrani
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2010-04-01
Journal Detail:
Title:  European journal of applied physiology     Volume:  109     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-23     Completed Date:  2010-11-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1037-45     Citation Subset:  IM    
Institute of Sport Sciences, University of Lausanne, Bâtiment de Vidy, 1015, Lausanne, Switzerland.
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MeSH Terms
Adipose Tissue / physiology*
Bicycling / physiology*
Metabolic Clearance Rate
Oxygen / metabolism*
Oxygen Consumption / physiology*
Running / physiology*
Reg. No./Substance:

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