Using Participatory Action Research to Enhance Physical Education Interventions for Promoting Active Lifestyles in Schools: A Study Design and Protocol.

Promoting active lifestyles among adolescents is essential due to their short-, medium-, and long-term contributions to young people's holistic development and overall health. Beyond physical well-being, Physical Education foster physical activity, autonomy, social connectedness, motivation and emotional well-being, thus constituting a key dimension of quality education.

Background/objectives: The "Estilos de Vida Activos (EVA)" project is a school-based intervention designed to foster adolescent agency and motivation in adopting active habits. Grounded in the salutogenic model, self-determination theory, and the health-based Physical Education pedagogical model, this protocol describes the design and implementation strategies of a participatory intervention in secondary schools.

Methods: A variety of research methods will be used to collect quantitative and qualitative data before, during, and after the intervention. Validated questionnaires will assess active commuting, socioeconomic status, satisfaction of basic psychological needs, motivation, levels and intention to engage in physical activity. Qualitative data include interviews with teachers, Photovoice sessions with students, observation notes, and programme materials.

Intervention: The EVA intervention is collaboratively developed by students, teachers, and researchers using participatory action research. It includes needs analysis, participatory activities, and co-design of tailored physical activity programmes. The intervention is described using the Template for Intervention Description and Replication checklist (TIDieR) to enhance transparency and replicability.

Conclusions: This protocol presents a theoretically grounded and participatory approach to school-based health promotion. By integrating educational and collaborative strategies, it offers a replicable model that promotes adolescent active lifestyles, from contextual relevance, and pedagogical coherence, serving as a guide for inclusive and sustainable interventions in school settings.