1. Adolescent health and development. World Health Organization (WHO); c2021 [cited - 2021 Sep 20]. (Available from: https://www.who.int/westernpacific/news/q-a-detail/adolescent-health-and-development)
2. Physical Activity Guidelines for School-Aged Children and Adolescents. Centers for Disease Control and Prevention (CDC); c2021 [cited date - 2021 Sep 20]. (Available from: https://www.cdc.gov/healthyschools/physicalactivity/guidelines.htm)
3. Global Recommendations on Physical Activity for Health-5–17 years old. World Health Organization (WHO); c2021 [cited date - 2021 Sep 20]. (Available from: https://www.who.int/dietphysicalactivity/physical-activity-recommendations-5-17years.pdf)
4. Eckstein F, Faber S, Mühlbauer R, Hohe J, Englmeier KH, Reiser M, et al. Functional adaptation of human joints to mechanical stimuli. Osteoarthr Cartil. 2002;10 (1):44–50.
5. Jones G, Ding C, Glisson M, Hynes K, Ma D, Cicuttini F. Knee articular cartilage development in children: a longitudinal study of the effect of sex, growth, body composition, and physical activity. Pediatr Res.2003;54(2):230-6.