1Bouchard, C, Shepard, R, Stephens, T. Physical Activity, Fitness, and Health: International Proceedings and Consensus Statement. Champaign IL: Human Kinetics, 1994.
2Biddle, S, Gorely, T, Stensel, D. Health-enhancing physical activity and sedentary behaviour in children and adolescents. Journal of Sports Sciences 2004; 22: 679–701.
3Caspersen, CJ, Merritt, RK, Stephens, T. International physical activity patterns: a methodological perspective. In: Dishman, R, ed. Advances in Exercise Adherence. Champaign IL: Human Kinetics, 1994; 73.
4Steptoe, A, Wardle, J, Fuller, R, Holte, A, Justo, J, Sanderman, R, et al. Leisure-time physical exercise: prevalence, attitudinal correlates, and behavioral correlates among young Europeans from 21 countries Preventive Medicine 1997; 26: 845–54.
5Myers, L, Coughlin, SS, Webber, LS, Srinivasan, SR, Berenson, GS. Physical and sedentary activity in school children grades 5–8: The Bogalusa Heart Study. Medicine and Science in Sports and Exercise 1996; 28: 852–9.
6Rowland, TW. Adolescence: a ‘risk factor’ for physical inactivity. President's Council on Physical Fitness and Sports Research Digest 1999; 3: 1–8.
7Trost, SG, Pate, RR, Sallis, JF, Freedson, PS, Taylor, WC, Dowda, M, et al. Age and gender differences in objectively measured physical activity in youth. Medicine and Science in Sports and Exercise 2002; 34: 350–5.
8Lefevre, J, Philippaerts, R, Delvaux, K, Thomis, M, Vanreusel, B, Vanden Eynde, B, et al. Daily physical activity and physical fitness from adolescence to adulthood: a longitudinal study. American Journal of Human Biology 2000; 12: 487–97.
9Malina, R. Tracking of physical activity and physical fitness across the lifespan. Research Quarterly for Exercise and Sport 1996; 67: 48–57.
10National Association of Physical Education and Sports. Guidelines for Appropriate Physical Activity for Elementary School Children: Update 2003. Reston, VA: National Association of Physical Education and Sports, 2003.
11Lobstein, T, Frelut, ML. Prevalence of overweight among children in Europe. Obesity Reviews 2003; 4: 195–200.
12Jolliffe, D. Extent of overweight among US children and adolescents from 1971 to 2000. International Journal of Obesity and Related Metabolic Disorders 2004; 28: 4–9.
13Baranowski, T, Anderson, C, Carmack, C. Mediating variable framework in physical activity interventions: how are we doing? How might we be doing better?. American Journal of Preventive Medicine 1998; 15: 266–97.
14Sallis, J, Prochaska, J, Taylor, W. A review of correlates of physical activity of children and adolescents. Medicine and Science in Sports and Exercise 2000; 32: 963–75.
15Sallis, JF, Saelens, BE. Assessment of physical activity by self-report: status, limitations, and future directions. Research Quarterly for Exercise and Sport 2000; 71: 1–14.
16Marshall, S, Biddle, S, Sallis, J, McKenzie, T, Conway, T. Clustering of sedentary behaviors and physical activity among youth: a cross-national study. Pediatric Exercise Science 2002; 14: 401–17.
17Seefeldt, V, Malina, RM, Clark, MA. Factors affecting levels of physical activity in adults. Sports Medicine 2002; 32: 143–68.
18Duncan, TE, McAuley, E. Social support and efficacy cognitions in exercise adherence: a latent growth curve analysis. Journal of Behavioral Medicine 1993; 16: 199–218.
19Verstraete, SJM, Cardon, GM, Trost, SG, De Bourdeaudhuij, IMM. Comparison of the reliability and validity of a questionnaire to measure usual physical activity in children with and without the cooperation of a parent. Medicine and Science in Sports and Exercise 2003; 5: S337.
20Deforche, B, De Bourdeaudhuij, I, Tanghe, A, Hills, AP, De Bode, P. Changes in physical activity and psychosocial determinants of physical activity in children and adolescents treated for obesity. Patient Education and Counseling 2004; 55: 407–15.
21US Department of Health and Human Services (DHHS). Physical Activity and Health: A Report of the Surgeon General. Atlanta GA: US DHHS, Centers for Disease Control and Prevention, 1996; 234–5.
22Trost, SG, Pate, RR, Ward, DS, Saunders, R, Riner, W. Correlates of objectively measured physical activity in preadolescent youth. American Journal of Preventive Medicine 1999; 17: 120–6.
23Cardon, G, De Bourdeaudhuij, I. Physical education and physical activity in elementary schools in Flanders. European Journal of Physical Education 2002; 7: 5–18.
24De Bourdeaudhuij, I, Sallis, J, Vandelanotte, C. Tracking and explanation of physical activity over a 7-year period. Research Quarterly for Exercise and Sport 2002; 73: 376–85.