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Background/Aims: To examine the effects of a 3-month multidisciplinary intervention on anthropometric measures, physical activity patterns and fitness, inflammatory cytokines, adipocytokines, and growth mediators in obese children. Methods: 21 obese subjects completed the 3-month intervention and were compared with 20 age-, gender- and maturity-matched controls. Subjects underwent anthropometric measurements (weight, height, BMI percentile and waist circumference), blood tests (IL-6, CRP, leptin, adiponectin, insulin, IGF-I and glucose), a progressive treadmill exercise test to evaluate fitness, and habitual activity assessment before and after the intervention. Results: The intervention led to a significant change of differences in body weight (-1.3 ± 4.1 vs. 2.5 ± 3.3 kg), BMI percentile (-0.96 ± 1.29 vs. 0.19 ± 0.8), waist circumference (-2.1 ± 2.7 vs. 2.9 ± 3.0 cm) and running time (149.9 ± 86.3 vs. -8.2 ± 88.0 s) in the intervention compared to control. There was a significant increase in leisure-time physical activity (Godin questionnaire, 29.04 ± 6.8 vs. -1.3 ± 9.2) and a decrease in sedentary activity (-1.4 ± 0.73 vs. 0.02 ± 0.62 h/day) in the intervention compared to control. Significant change differences in adiponectin (2,308 ± 1,640 vs. -801 ± 465 ng/ml), IGF-I (33.8 ± 37.8 vs. -1.0 ± 36.2 ng/ml), CRP (-0.06 ± 0.29 vs. 0.5 ± 0.86 mg/dl) and HOMA-IR (-0.15 ± 0.57 vs. 0.55 ± 0.84) were found in the intervention group compared to control. Conclusions: Our results highlight the short-term beneficial effects of a childhood obesity multidisciplinary intervention on anthropometrics, habitual activity, fitness, inflammatory and metabolic measures. The longer-term effects of these changes on obesity-associated metabolic risks are yet to be determined.