Physical activity
Conditions
Interventions
There will be two intervention conditions: [A] The social network intervention and [B] the mass media intervention. The control condition will not receive an intervention, but will have the opportunit
Sponsors
Behavioural Science Institute, Radboud University Nijmegen
Eligibility
Inclusion criteria
Inclusion criteria: Adolescents who have active consent of their parents and attend the last three years of primary school or the first three years of secondary school.
Exclusion criteria
Exclusion criteria: Adolescents in classrooms with a participation rate lower than 60%, will be excluded from the study. This is the threshold is based on the internal reliability of peer nomination measures (Marks, Babcock, Cillessen, & Crick, 2013). Incomplete days of physical activity data will be excluded from the analyses. The data should at least have 1435 of recorded minutes of data. Additionally, the Fitbit measure should at least count 1000 steps on a day to ensure that the devices has been worn.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Physical activity (steps per day and minutes MVPA per day), measured by accelerometer (Fitbit Flex). In addition, a physical activity questionnaire (ObiN) will be added in case of malfunction of the Fitbit. | — |
Secondary
| Measure | Time frame |
|---|---|
| - Motivation - Athletic competence - Self-Efficacy - Social norms - Physical activity enjoyment | — |
Contacts
Public ContactT. Woudenberg, van
Outcome results
None listed