2025, Vol. 12, Issue 6, Part E

Purpose: This study aimed to evaluate the effects of a 12-week structured physical activity intervention on Body Mass Index (BMI), Body Fat Percentage (BFP), and Body Composition among obese adolescents.

Methods: A total of 45 male adolescents (aged 14–17 years) were randomly assigned into three groups: Experimental (n=15), Obese Control (n=15), and Non-Obese Control (n=15). The experimental group participated in a supervised physical activity program three times per week for 12 weeks, while both control groups followed their regular routines. Anthropometric measurements including BMI, BFP, and body composition were recorded pre- and post-intervention. Data were analyzed using paired t-tests, one-way ANOVA, and LSD post hoc tests. Effect sizes and Cronbach’s alpha for internal consistency were also calculated.

Results: Post-intervention analysis revealed statistically significant differences among groups in BMI (F(2,42) = 30.93, p <.05, η² =.60), BFP (F(2,42) = 198.34, p <.05, η² =.90), and body composition (F(2,42) = 7.21, p =.002, η² =.26). The experimental group showed the most substantial improvements across all parameters, while the obese control group showed minimal change.

Conclusion: The findings suggest that structured physical activity significantly improves key anthropometric health markers in obese adolescents. Schools should consider incorporating regular, targeted exercise programs to support healthy physical development and obesity management.