Teun Remmers

142 | Chapter 8 constrains due to competing activities such as organized sports participation or homework may also be considered in comparing results with other studies. However, as we separately investigated bicycling, walking and leisure time, results of leisure time PA may be generalizable to less cycle-friendly environments. Conclusion We demonstrated that with combined accelerometer and GPS methodologies, it is possible to investigate associations between the built environment and context-specific afterschool PA behaviour. In addition, detailed GIS data and theory-based spatial analyses enable researchers to further optimize objectively measured environmental exposure assessment. We found that greenspaces (i.e. lawns and shrubs) and smaller distances from children's residence to their school were associated with more afterschool leisure time PA and walking. References 1. Telama R. Tracking of Physical Activity from Childhood to Adulthood: A Review. Obesity Facts. 2009;2(3):187-95. 2. Fairclough SJ, Butcher ZH, Stratton G. Whole-day and segmented-day physical activity variability of northwest England school children. Preventive Medicine. 2007;44(5):421-5. 3. Giles-Corti B, Timperio A, Bull F, Pikora T. Understanding physical activity environmental correlates: increased specificity for ecological models. Exercise and Sport Sciences Reviews. 2005;33(4):175-81. 4. Hubbard K, Economos CD, Bakun P, Boulos R, Chui K, Mueller MP, et al. Disparities in moderate-to-vigorous physical activity among girls and overweight and obese schoolchildren during school-and out-of-school time. International Journal of Behavioral Nutrition and Physical Activity. 2016;13(1):1. 5. Arundell L, Ridgers ND, Veitch J, Salmon J, Hinkley T, Timperio A. 5-year changes in afterschool physical activity and sedentary behavior. American Journal of Preventive Medicine. 2013;44(6):605-11. 6. De Baere S, Lefevre J, De Martelaer K, Philippaerts R, Seghers J. Temporal patterns of physical activity and sedentary behavior in 10–14 year-old children on weekdays. BMC Public Health. 2015;15(1):791. 7. Hager RL. Television viewing and physical activity in children. Journal of Adolescent Health. 2006;39(5):656-61. 8. Gardner B, Lally P. Does intrinsic motivation strengthen physical activity habit? Modeling relationships between self-determination, past behaviour, and habit strength. Journal of Behavioral Medicine. 2013;36(5):488-97. 9. Hagger MS, Chatzisarantis NL. Intrinsic motivation and self-determination in exercise and sport. Champaigne, IL: Human Kinetics; 2007.