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Br J Sports Med doi:10.1136/bjsm.2007.044529

Comparison of fat oxidation during exercise between lean and obese pubertal boys: clinical implications

  1. Gautier ZUNQUIN (gautier.zunquin{at}hotmail.fr)
  1. RELACS, France
    1. Denis THEUNYNCK (denis.theunynck-septentrion{at}wanadoo.fr)
    1. RELACS, France
      1. Bruno SESBOUE (sesboue-b{at}chu-caen.fr)
      1. CHU de Caen, France
        1. Pierre ARHAN (pierre.arhan{at}wanadoo.fr)
        1. CHU de Caen, France
          1. Dominique BOUGLE (dbougle{at}wanadoo.fr)
          1. CH de Bayeux, France
            • Published Online First 2 April 2008

            Abstract

            Objective: The study examined fat oxidation rates (FOR) during exercise in lean and obese pubescent children.

            Design: Two groups of pubescent boys (13 lean: 12 ± 0.48 years old, BMI=18.56 kg/m2 ± 1.12; 17 obese: 12.1± 0.1 years old, BMI=26.68 kg/m2 ± 3.37 (p<0.001) performed a graded test on a leg cycle ergometer. The first step of the test was fixed at 30 W and power was gradually increased 20 W every 3 minutes 30 seconds. The average measurement of ventilatory gas was obtained during the last 30 seconds of each step which allowed us to calculate FOR vs exercise intensity.

            Results: At low intensity, 0-30 % of VO2 peak, when Fat Free Mass is considered, FOR are identical for the two groups. At higher intensities, 40, 50 and 60% of VO2 peak, FOR is significantly higher in lean vs. obese boys.

            Conclusion: The study confirms that obese pubertal boys have FFM decreased capacities to use fat during moderate exercise. The study suggests that obese boys have to practice physical activity at a lower intensity than healthy boys to enhance lipolysis and diminish adipose tissue and the consequences of obesity.

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