BOOSTH: Serious Gaming in Combination With Physical Activity Promotion

The investigational treatment consists of regular COACH care and the BOOSTH physical activity intervention. Children in the intervention group will start with the physical activity intervention. The child will receive the BOOSTH activity tracker. The child (under supervision of their parents) needs to download the BOOSTH sync app and the BOOSTH game app. Therefore it is important that the child or their parents have a device with Bluetooth. The investigators create a login account for the child. After installing the apps, the activity tracker measures step counts which are translated into activity points. These activity points will be used to unlock levels in the BOOSTH game app. The child synchronizes their activity points, with Bluetooth connection, in the BOOSTH sync app and immediately the child could open the BOOSTH game app to play a level in the game. The child needs seven green lights (corresponding to 30 minutes of performed physical activity) to unlock a level in the game. The first four levels are for free, to gain interests of the child, but thereafter the child needs to be physically active to unlock the rest of the levels in the game. The intervention consists of a combination of supporting strategies: • BOOSTH game: it is a reward based game since the child needs to perform physical activity to unlock a level in the game. The BOOSTH game is a jump and run game. • Lights on the activity tracker: the child will be stimulated to promote physical activity by using green lights on the activity tracker. The more performed physical activity, the more green lights on the activity tracker (maximum of seven green lights). When the maximum is reached the child could use the activity points to unlock a level in the game. • Group system: a special COACH group (in the BOOSTH game app) will be created. Children can compare their scores with each other and challenge each other to gain more activity points. • Every week the child receives a reminder (by email or phone) to promote physical activity. Every week the researcher will download the BOOSTH data. Individual adjustments and encouragement could be made based on results of the data. • The medical doctor (MD) will stimulate physical activity behavior during regular COACH visits and promote the use of BOOSTH The intervention duration is 6 months. Measurements will be performed at baseline, 3-, 6- and twelve months after the start.