KIJANI App to Promote Physical Activity in Children and Adolescents: Protocol for a Mixed Method Evaluation

Background: The prevalence of physical inactivity among children and adolescents is alarmingly high despite the well -documented and comprehensive benefits of regular physical activity (PA). Therefore, PA promotion should start early in childhood and adolescence. Although reducing recreational screen time in children and adolescents is an urgent concern, digital approaches have the potential to make activity promotion attractive and age appropriate for the target group. KIJANI is a mobile app approach to promote PA in children and adolescents via gamification and augmented reality. Objective: This study protocol aims to describe the KIJANI intervention in detail, as well as the evaluation approach. Methods: KIJANI is based on the concept that virtual coins can be earned through PA, for example, in the form of a collected step count. With these coins, in turn, blocks can be bought, which can be used to create virtual buildings and integrate them into the player's real -world environment via augmented reality. PA of users is detected via accelerometers integrated into the smartphones. KIJANI can be played at predefined play locations that were comprehensively identified as safe, child -friendly, and attractive for PA by the target group in a partner project. The evaluation process will be divided into 2 different stages. The phase -I evaluation will be a mixed methods approach with one-on-one semistructured interviews and questionnaires to evaluate the user experience and receive feedback from the target group. After the implementation of results and feedback from the target group, the phase -II evaluation will proceed in the form of a 2 -arm randomized controlled trial, in which the effectiveness of KIJANI will be assessed via objectively measured PA as well as questionnaires. Results: The study received ethical approval from the ethical board of the Technical University of Munich. Participants for the phase -I evaluation are currently being recruited. Conclusions: The study will help to determine the efficacy, applicability, and user experience of a gamified activity promotion application in children and adolescents. Overall, digital health approaches provide easy and wide reachability at low cost and are age appropriate and attractive for the target group of adolescents. Strategies have to be developed to apply digital health approaches in the best possible way for activity promotion. International Registered Report Identifier (IRRID): DERR1-10.2196/55156 (JMIR Res Protoc 2024;13:e55156) doi: 10.2196/55156