Sherrie
09-04-2008, 09:57 AM
Comparison of fat oxidation during exercise between lean and obese pubertal boys: clinical implications
Gautier ZUNQUIN 1*, Denis THEUNYNCK 1, Bruno SESBOUE 2, Pierre ARHAN 2 and Dominique BOUGLE 3
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.
Gautier et al, Comparison of fat oxidation during exercise between lean and obese pubertal boys: clinical implications. Br J Sports Med. Published Online First: 2 April 2008 (http://bjsm.bmj.com/cgi/content/abstract/bjsm.2007.044529v1)
Gautier ZUNQUIN 1*, Denis THEUNYNCK 1, Bruno SESBOUE 2, Pierre ARHAN 2 and Dominique BOUGLE 3
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.
Gautier et al, Comparison of fat oxidation during exercise between lean and obese pubertal boys: clinical implications. Br J Sports Med. Published Online First: 2 April 2008 (http://bjsm.bmj.com/cgi/content/abstract/bjsm.2007.044529v1)