1. Fact Sheet Physical Activity. Global recommendations on physical activity for health. Available at: http://www.euro.who.int/__data/assets/pdf_file/0005/288041/WHO-Fact-Sheet-PA-2015.pdf. Accessed February 29, 2016.
2. ACSM, AHA Support federal physical activity guidelines. Available at: https://www.acsm.org/about-acsm/media-room/acsm-in-the-news/2011/08/01/acsm-aha-support-federal-physical-activity-guidelines. Accessed February 29, 2016.
3. Disparities in physical activity and sedentary behaviors among US children and adolescents: prevalence, correlates, and intervention implications;Whitt-Glover;J Public Health Policy,2009
4. Physical activity in the United States measured by accelerometer;Troiano;Med Sci Sports Exerc,2008
5. Adolescent physical activity and inactivity vary by ethnicity: the National Longitudinal Study of Adolescent Health;Gordon-Larsen;J Pediatr,1999