Objective. To study the effects of regular physical activity on the morphological, physiological and body composition parameters of overweight and obese adolescents.Methods. We conducted an experimental study with30 adolescents divided in two according to their body mass index. The group 1 was composed of overweight subjects with a body mass index between 25-29.9 kg/m 2 , and group 2 obese subjects with a body mass index ³ 30 kg/m 2 subjected to a program of adapted physical activity associated with a low-calorie nutrition education low in cholesterol and in saturated fatty acids (bad fats), low-fat rich in vegetables, fruits and vitamins for a period of six months.Results. This study reveals that after six months of intervention, overweight subjects significantly decreased waist circumference (82.9 ± 4.2 cm before versus 77.6 ± 4.6 cm after), heart rate (86.8 ± 3.6 beat/min before versus 81.4 ± 3.8 beat/min after), total fat (32.2 ± 1.8% before versus 27.2 ± 1.5% after), visceral fat (16.6 ± 2.3% before versus 11.1 ± 2.5% after), and decreased muscle (15.6 ± 2.7% before versus 19.4 ± 4.1% after), while obese subjects significantly decreased waist circumference (88.9 ± 6.2 cm before versus 85.8 ± 5.9 cm after), visceral fat (17.4 ± 3.2% before versus 14.1 ± 3.1% after), respiratory capacity (61.1 ± 2.7% before versus 65 ± 2.1%). In addition this study reveals that overweight subjects compared to obese subjects more changed their waist circumference (77.6 ± 4.6 cm for overweight versus 85.8 ± 5.9 cm for obese), body mass index (24.9 ± 4.1 kg/m 2 for overweight versus 28.8 ± 1.2 kg/m 2 for obese), heart rate (81.4 ± 3.8 beat/min for overweight versus 28.8 ± 1.2 beat/min for obese), visceral fat (11.1 ± 2.5% for overweight versus 14.1 ± 3.1% for obese), and muscle (19.4 ± 4.1% for overweight versus 17.1 ± 2.1%). Conclusion.Obese adolescents have by means of regular activity significantly changed their morphological, physiological and body composition parameters of overweight and obese.

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