مرکز منطقه ای اطلاع رسانی علوم و فناوری Journal of Sports Physiology and Athletic Conditioning 2783-3038 6 20 2026 9 14 Comparative Effects of Eight Weeks of High-Intensity Functional Training in Fasted versus Fed States on the Lipid Profile of Overweight Adolescent Boys Comparative Effects of Eight Weeks of High-Intensity Functional Training in Fasted versus Fed States on the Lipid Profile of Overweight Adolescent Boys en Sadegh Abdollahi Islamic Azad University Mohadeseh BandarRigi Chamran University Mohammad Ali Azarbayjani Central Tehran Branch, Islamic Azad University, Tehran, Iran 2026 6 13 Background: Overweight is commonly associated with lipid abnormalities and an increased risk of metabolic disorders. Considering the beneficial role of exercise in improving blood lipid levels, the present study aimed to compare the effects of eight weeks of high intensity functional training (HIFT) performed in the fasted state versus the fed state on the lipid profile of overweight adolescent boys. Materials and Methods: In this quasi-experimental study, 36 overweight adolescent boys were selected and randomly assigned to three equal groups (n = 12 each): fasted training, fed training, and control. Participants in the training groups performed an eight-week HIFT program, three sessions per week, consisting of eight exercises targeting the upper body, core, and lower body. Blood samples were collected 48 hours before the first training session and 48 hours after the final session to assess lipid profile indices. Statistical analysis included analysis of covariance (ANCOVA), the Kolmogorov–Smirnov test for normality, and paired t tests to compare within group mean differences. Results: The results showed that after eight weeks of training, both exercise groups demonstrated significant reductions in triglycerides (TG), total cholesterol (TC), and low-density lipoprotein (LDL), along with a significant increase in high-density lipoprotein (HDL) (p < 0.05). Furthermore, ANCOVA results indicated significant differences between the fasted and fed training groups in the changes observed in TG, TC, LDL, and HDL (p < 0.05), with the fasted training group showing greater improvements in lipid profile indices. Conclusion: High-intensity functional training improves the lipid profile in overweight adolescents, and performing this training in a fasted state may produce more favorable effects on lipid indices compared with training in a fed state. Therefore, fasted HIFT may be considered an effective strategy for improving metabolic health in overweight adolescents.

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