The control group will attend a healthy lifestyle education program (2 days/month) and supportive therapy and behavioral advice for both children and parents to improve nutrition and physical activity (nutritionists and psychologists).~The intervention group will attend an exercise (3 days/week) and healthy lifestyle education (2 days/month) combined program. Training sessions will include 90 minutes of exercise, comprising warm-up and skill development, moderate to vigorous aerobic activities, flexibility and strength exercises.~Before (baseline) and after the intervention (6 months) total and abdominal adiposity, lean tissue mass and bone mass density (dual-X-ray-absorptiometry), abdominal visceral and hepatic adiposity (magnetic resonance imaging), and blood insulin, glucose, C-reactive protein, alanine aminotransferase, aspartate aminotransferase, gamma-glutamil transpeptidase and lipid profile will be measured. Furthermore, cardiorespiratory fitness (treadmill test) and blood pressure will be measured before and after the intervention. Changes (6 months - baseline) in dietary habits will be estimated by using two repeated 24h recalls and food frequency questionnaires and changes (6 months - baseline) in physical activity by accelerometry.
The objective of the present study is to evaluate the effect of 6 months exercise intervention program on hepatic fat fraction in overweight children.~Methodology: A total of 160 children, 9-11 years old, will be randomly assigned to control (N=80) or intervention (N=80) groups. Training sessions will include 90 minutes of exercise, comprising warm-up and skill development. The control group will attend a healthy lifestyle education program (2 days/month) and the intervention group an exercise (3 days/week) and healthy lifestyle education (2 days/month) combined program. Before and after the intervention (6 months) hepatic fat fraction, body composition, , and cardiometabolic risk factors will be measured. Furthermore, dietary habits and physical activity, blood pressure and pubertal development will be evaluated before and after the intervention.