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Determination of the maximal fat oxidation point in obese children and adolescents: validity of methods to assess maximal aerobic power |
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| Authors: | Julien Aucouturier Mélanie Rance Martine Meyer Laurie Isacco David Thivel Nicole Fellmann Martine Duclos Pascale Duché |
| Affiliation: | 1.Laboratoire Inter-Universitaire de Biologie des Activités Physiques et Sportives (BAPS),Université Blaise Pascal,Clermont-Ferrand,France;2.Centre Hospitalier Universitaire (CHU) de Clermont-Ferrand,Service Pédiatrie B, H?pital H?tel Dieu,Clermont-Ferrand,France;3.Laboratoire de Nutrition Humaine,INRA, UMR 1019,Clermont-Ferrand,France;4.Centre Hospitalier Universitaire (CHU) de Clermont-Ferrand,Service de Médecine du Sport et des Explorations Fonctionnelles, H?pital G. Montpied,Clermont-Ferrand,France;5.Laboratoire de Physiologie-Biologie du Sport,Université Auvergne, UFR Médecine,Clermont-Ferrand,France;6.Laboratoire Inter-Universitaire de Biologie des Activités Physiques et Sportives (BAPS),Batiment de Biologie B, Complexe Universitaire des Cézeaux,Aubière Cedex,France |
| Abstract: | We aimed to examine the interchangeability of techniques used to assess maximal oxygen consumption ( ) and maximal aerobic power (MAP) employed to express the maximal fat oxidation point in obese children and adolescents. Rate of fat oxidation were measured in 24 obese subjects (13.0 ± 2.4 years; Body Mass Index 30.2 ± 6.3 kg m−2) who performed a five 4-min stages submaximal incremental cycling exercise. A second cycling exercise was performed to measure  . Results are those of the 20 children who achieved the criterion of RER (>1.02) to assess the attainment of  . Although correlations between results obtained by different methods were strong, Bland–Altman plots showed little agreement between the maximal fat oxidation point expressed as a percentage of measured  and as %  estimated according to ACSM guidelines (underestimation : −5.9%) or using the predictive equations of Wasserman (−13.9%). Despite a mean underestimation of 1.4% several values were out of the limits of agreement when comparing measured MAP and Theoretical MAP. Estimations of  lead to underestimations of the maximal fat oxidation point. |
| Keywords: | Exercise Obesity Children Maximal fat oxidation point |
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