Development of a Planned Behavior Theory-Based Physical Activity Application for High School Adolescent Girls

The aim of this study is to examine the effects of a physical activity intervention plan developed based on the theory of planned behavior on the physical activity levels of adolescent girls, their sedentary time and their knowledge about physical activity. Within the scope of this research, answers to the following research questions will be sought; 1. Is there a difference in physical activity level between participants in the physical activity intervention plan groups and the control group? 2. Is there a difference in terms of daily sedentary time between participants in the physical activity intervention plan groups and the control group? 3. Is there a difference in beliefs about physical activity between participants in the physical activity intervention plan groups and the control group? In this context, researchers will compare 3 groups within the scope of the data provided by two preliminary studies conducted previously. These groups; (1) intervention group based on the theory of planned behavior, (2) intervention group based on the theory of planned behavior with family participation, (3) control group.