Marko, MichalAdamčák, ŠtefanMandzáková, MartinaKľocová Adamčáková, Zora2025-11-212025-11-2120251339-30222644-4909https://repo.umb.sk/handle/123456789/999https://zl.tnuni.sk/index.php?id=21In: Zdravotnícke listy : vedecký recenzovaný časopis. Trenčín : Trenčianska univerzita Alexandra Dubčeka v Trenčíne, 2025. ISSN 1339-3022. Roč. 13, č. 3 (2025), s. 53-59.Introduction: Postural deviations in school-age boys represent growing public health concerns, often linked to sedentary behavior, insufficient physical activity, and inadequate ergonomic conditions. While out-of-school settings offer promising settings for preventive interventions, research in this context remains limited. Aim: The study aimed to evaluate the effects of 8-week intervention on posture in school-age boys, attending out-of-school settings. Materials and Methods: Quasi-experimental design involved 35 male participants (age: 9.4 ± 0.3 years), with 20 assigned to experimental group receiving the intervention and 15 to nonintervention control group. The program consisted of 20-minute sessions, conducted 3/ week over 8 weeks. Parameters of posture (head/neck, chest, abdomen/pelvis, spine, shoulders/ scapulas) were evaluated pre- and post-intervention using validated observational tools (Klein and Thomas/Mayer method). Results: Statistical analysis (Wilcoxon and Mann-Whitney U-Tests) revealed significant post-intervention improvements (p < 0.01) in all evaluated parameters within the experimental group, accompanied by large effect sizes. No significant change was observed in the control group. CONCLUSIONS: Results demonstrate that brief, structured interventions can produce clinically meaningful improvements in postural health among school-age boys, affirming the utility of out-of-school settings for posture correction and prevention.enCC BY-NC Creative Commons Attribution-NonCommercial 4.0. Internationalinfo:eu-repo/semantics/openAccessmimoškolská intervenciaextracurricular interventionposturálne zdraviepostural healthpreventívny programchlapciboysškolský vekschool ageArticle