A longitudinal study of the relationship between leisure-time physical activity and depressed mood among adolescents

Birkeland, M. S., Torsheim, T., & Wold, B. (2009). A longitudinal study of the relationship between leisure-time physical activity and depressed mood among adolescents. Psychology of Sport And Exercise, 10(1), 25-34. doi:10.1016/j.psychsport.2008.01.005