Teun Remmers

Investigating PA patterns in the transition from primary to secondary school | 169 Conclusion This study investigated longitudinal changes of PA patterns in its context in an important phase of children's PA development. This study contributed to the existing literature by investigating objectively measured- and context-specific PA patterns in the transition from primary to secondary school. Furthermore, given the importance of this transition-period for the development of long-term PA patterns, revealing relevant and changeable contexts, may aid in developing and focusing future PA interventions. Consistent with previous literature (4, 17-19), we found considerable declines in PA after school and in weekends in the transition phase. Declines in after school PA were predominantly caused by increased sedentary behaviour at their residence. Declines in PA during weekends were probably influenced by decreases of active transport and PA at other locations. On the other hand, increases were found in weekday active transport, which was related to increased distance between children's residence and their school. Acknowledgements This study was funded by the Netherlands Organization for Scientific Research (NWO). We would like to thank Menno Slingerlands in assisting in the study design. In addition, authors would like to thank Peter Kool and the municipality of 's-Hertogenbosch in facilitating this study. Authors acknowledge the assistance of Tim Schepers, Marieke Obbes and Veerle van den Heuvel in the measurements. Finally, we would like to thank participating schools, children and parents. References 1. Strong WB, Malina RM, Blimkie CJ, Daniels SR, Dishman RK, Gutin B, et al. Evidence based physical activity for school-age youth. The Journal of Pediatrics. 2005;146(6):732-7. 2. Boreham CAG, McKay HA. Physical activity in childhood and bone health. British Journal of Sports Medicine. 2011;45. 3. Biddle SJ, Asare M. Physical activity and mental health in children and adolescents: a review of reviews. British Journal of Sports Medicine. 2011;45:886-896. 4. Telama R. Tracking of Physical Activity from Childhood to Adulthood: A Review. Obesity Facts. 2009;2(3):187-95. 5. Kristensen PL, Møller N, Korsholm L, Wedderkopp N, Andersen LB, Froberg K. Tracking of objectively measured physical activity from childhood to adolescence: the European youth heart study. Scandinavian Journal of Medicine & Science in Sports. 2008;18(2):171-8. 6. Nader PR, Bradley RH, Houts RM, McRitchie SL, O’Brien M. Moderate-to- vigorous physical activity from ages 9 to 15 years. The Journal of the American Medical Association. 2008;300(3):295-305.