RT journal article T1 Feasibility, acceptability, and effectiveness of a physically active lessons intervention: the ACTIVE CLASS pilot study A1 Ruiz Hermosa, Abel A1 Sánchez Oliva, David A1 Grao Cruces, Alberto A1 Medrano, María A1 González Pérez, María A1 Martín Acosta, Fátima A1 Camiletti Moirón, Daniel A2 Didáctica de la Educación FísicaPlástica y Musical AB Introduction: The aim of this study was to test the feasibility, acceptability, and effectivenessof a physically active learning (PAL) intervention (ACTIVE CLASS pilotstudy) to improve physical health and cognitive and academic performance, increasephysical activity (PA) levels, and reduce sedentary time (ST) in adolescents,and to analyze the distribution of activity intensity during a PAL lesson and assessdifferences with physical education lessons. Methods: A quasi-experimentalstudy was conducted including 77 students aged 12–14 yr from two Spanish secondaryschools. The ACTIVE CLASS pilot program consisted of integrating aweekly PAL lesson intomathematics lessons for 4 wk. Changes in body composition(bodymass index andwaist circumference), physical fitness (cardiorespiratoryandmuscular fitness), executive functions (inhibition, workingmemory, and cognitiveflexibility), and mathematical fluencyweremeasured. Accelerometer-based STand PA were measured in the intervention group. The feasibility and acceptabilityof the intervention were assessed using self-reported questionnaires for teachersand students. Repeated-measures analyses of variance were used to test the effectsof the intervention. Results: There were no significant improvements in bodycomposition, fitness, and cognitive and academic performance when comparingthe intervention and control groups. The inclusion of the PAL intervention significantlyincreased average PA levels and reduced ST during the school day, andno significant differences were found in accelerometer-based variables betweenphysical education and PAL lessons. In fact, PAL lessons could provide up to17min ofmoderate/vigorous PA. In addition, teachers and students reported goodfeasibility and acceptability of the PAL intervention. Conclusion: The findings supportfurther research with a longer-termintervention and a larger sample size to determinethe true potential of PAL for adolescents’ physical health, cognition, andacademic performance. PB Wolters Kluwer SN 2379-2868 YR 2025 FD 2025 LK http://hdl.handle.net/10498/36667 UL http://hdl.handle.net/10498/36667 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 07-nov-2026