Conclusion
The current study presents a picture of how an SDT-related motivational climate in ASPs impact adolescents’ MVPA changes over a 16-week intervention. Current findings are believed to be one of the first to identify a positive MVPA changing trajectory among underserved adolescents during a 16-week ASP intervention regardless of their gender and race. The findings suggest that changes in youth intrinsic motivation serves as a critical mechanism by which supportive PA climates promote adolescents’ daily MVPA. Future studies are needed to examine intrinsic and autonomous extrinsic motivations as mediators to better understand the impact of SDT-related motivational mechanism on adolescents’ MVPA.