Move it, Move ID! Promotion of Physical Activity in Adolescents With Intellectual Disability

Measuring the effect of the buddy and gamification components separately. During the A1 phase (baseline) and the A2 phase (reversal), participants will be asked not to use the 'Move it, Move ID' intervention: the app will be blocked. After an A phase, the app will be unblocked. During the B1 and B2 intervention phase, participants use the 'Move My it, Move ID' intervention only consisting of the buddycomponent. During the intervention period, adolescents and buddies are asked to wear an accelerometer. During the first AB pair we examine whether the buddy component has an effect on PA compared to no intervention. In the A2 reversal phase possible carryover effects can be measured. It will be informative to investigate whether some parts of the intervention are automatized or internalized and will still have some effect even when participants have no access to the intervention anymore (i.e. A2 phase). The study duration is 32 days; each phase will have a duration of minimum 5 days.

"After the first study, other participants will be recruited. In a second study, the set-up remains the same, but the A1 and A2 phase this time consist of the buddy component (i.e. control phase) and in the B1 and B2 phase the gamification component will be added. This way, we can determine whether the gamification component has an effect on PA compared to the baseline buddy component intervention.~The study duration is 32 days for all participants. The duration of the 4 different phases of the design will vary between participants, but each phase will have a duration of minimum 5 days."