Adolescents spend the majority of the day sedentary, especially at school whilst sitting in class and at home when performing school-related tasks. As high levels of sedentary time are associated with adverse health effects, effective interventions are needed. To improve effectiveness, literature recommends a co-creative approach in which adolescents and other key stakeholders (such as teachers) are actively involved in the choice and development of intervention strategies. Therefore, this project aims to co-adapt a previously co-created intervention targeting adolescents' school-related sedentary behaviour. Further, the effect of this co-adapted intervention on adolescents' sedentary behaviour and related determinants, sleep, and mental wellbeing will be evaluated via a three-arm clustered controlled trial, including a co-adaptation intervention arm, a standard intervention arm (including schools that were not involved in co-adapting the intervention) and a control arm (continuing their curriculum as usual). By comparing these three arms, the investigators can evaluate the added value of co-creation compared to not involving adolescents or stakeholders in the development of an intervention. Lastly, the investigators will conduct a process evaluation of (1) the co-adaptation approach used to adapt the co-created intervention and (2) the implementation of both the co-adapted and standard interventions. Studies that evaluate co-created interventions are scarce. However, if such interventions prove to be more effective, this approach could be promising to change adolescents' health behaviour.
Secondary schools need to have at least 150 pupils in the first two grades (Grade 7 and 8).
None
Parallel
Co-adapted intervention
BehavioralAn existing co-created intervention will be adapted by researchers and 7th and 8th grade pupils and teachers during 3 to 5 design sessions in both co-adaptation intervention schools.
Standard intervention
BehavioralThe existing co-created intervention will be implemented in the standard intervention schools. So, adolescents and school staff from the standard intervention schools will not be involved in adapting the intervention.
Sitting time and patterns of sitting time
Sitting time and patterns of sitting time will be derived from a GENEActiv accelerometer that will be worn on the non-dominant wrist.
Determinants of reducing and regularly interrupting sedentary time in general, in the classroom, and while making homework
These determinants will be measured using a questionnaire including items that will be answered on a 5-point Likert scale.
Sleeping time
Sleeping time will be derived from a GENEActiv accelerometer that will be worn on the non-dominant wrist.
Mental well-being
Mental well-being will be measured using the the World Health Organization-Five Well-Being Index (WHO-5).
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