Centers for Disease Control and Prevention (2011) Physical activity and fitness. Healthy people 2020: Physical activity. http://healthypeople.gov/2020/topicsobjectives2020/overview.aspx?topicid=33
 Kim, J., Must, A., Fitzmaurice, G.M., Gillman, M.W., Chomitz, V., Kramer, E., McGowan, R., Peterson, K.E. (2005) Relationship of physical fitness to prevalence and incidence of overweight among schoolchildren. Obesity Research, 13, 1246-1254. doi:10.1038/oby.2005.148
 Sallis, J.F., McKenzie, T.L., Kolody, B., Lewis, M., Marshal, S. and Rosengard, P. (1990) Effects of health-related physical education on academic achievement: Project SPARK. Research Quarterly for Exercise and Sport, 70, 127-134.
 Task Force on Community Preventive Services (2000) Recommendations to increase physical activity in communities. HSTAT: Guide to clinical preventive services. 3rd Edition, Recommendations and Systematic Evidence Reviews, Guide to Community Preventive Services. http://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=hstat3
 Pollock, M.L., Gaesser, G.A., Butcher, J.D., Despres, J.-P., Dishman, R.K., Franklin, B.A., Garber, C.E. (1998) ACSM position stand: The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults. Med and Science in Sports and Exercise, 30, 975-991. doi:10.1097/00005768-199806000-00032
 Bernstein, M.S., Costanza, M.C. and Morabia, A. (2004) Association of physical activity intensity levels with overweight and obesity in a population-based sample of adults. Preventive Medicine, 38, 94-104. doi:10.1016/j.ypmed.2003.09.032
 Pietilainen, K.H., Kaprio, J., Borg, P., Plasqui, G., Yki-Jarvinen, H., Kujala, U.M., Rose, R.J., Westerterp, K.R. and Rissanen, A. (2007) Physical inactivity and obesity: A vicious circle. Obesity, 16, 409-414.
 Coe, D.P., Pivarnik, J.M., Womack, C.J., Reeves, M.J. and Malina, R.M. (2006) Effect of physical education and activity levels on academic achievement in children. Medicine & Science in Sports & Exercise, 38, 1515-1519.
 Mo Suwan, L., Lebel, L., Puetpaiboon, A. and Junjana, C. (1999) School performance and weight status of children and young adolescents in a transitional society in Thailand. International Journal of Obesity, 23, 272-277. doi:10.1038/sj.ijo.0800808
 Shore, S.M., Sachs, M.L., Lidicker, J.R., Brett, S.N., Wright, A.R., Libonati, J.R. (2008) Decreased scholastic achievement in overweight middle school students. Obesity, 16, 1535-1538. doi:10.1038/oby.2008.254
 Levin, S., Lowry, R., Brown, D.R. and Dietz, W.H. (2003) Physical activity and body mass index among US adolescents: Youth risk behavior survey. Archives of Pediatrics & Adolescent Medicine, 157, 816-820. doi:10.1001/archpedi.157.8.816
 Vogels, N., Westerterp, K.R., Posthumus, D.L.A., Rutters, F. and Westerterp-Plantenga, M.S. (2007) Daily physical activity counts vs structured activity counts in lean and overweight Dutch children. Physiology and Behavior, 92, 611-616.
 Ekelund, U., Aman, J., Yngve, A., Renman, C., Westerterp, K. and Sjostrom, M. (2002) Physical activity but not energy expenditure is reduced in obese adolescents: A case-control study. American Journal of Clinical Nutrition, 76, 935-941.
 Hoed, M. and den Westerterp, K.R. (2008) Body composition is associated with physical activity in daily life as measured using a triaxial accelerometer in both men and women. International Journal of Obesity, 32, 1264-1270. doi:10.1038/ijo.2008.72
 Sharpe, P.A., Granner, M.L., Hutto, B., Ainsworth, B.E. and Cook, A. (2004) Association of body mass index to meeting physical activity recommendations. American Journal of Health Behavior, 28, 522-530. doi:10.5993/AJHB.28.6.5
 Kaleta, D., Makowiec-Dabrowska, T. and Jegier, A. (2007) Occupational and leisure-time energy expenditure and body mass index. International Journal of Occupational Medicine and Environmental Health, 20, 9-16. doi:10.2478/v10001-007-0009-1
 Noble, J. and Sawyer, R. (2002) Predicting different levels of academic success in college using high school GPA and ACT composite score. ACT Research Report Series 2002-2004. www.act.org/research/policymakers/pdf/PredictiveValidity.pdf
 Tammelin, T., Laitinen, J. and Nayha, S. (2004) Change in the level of physical activity from adolescence into adulthood and obesity at the age of 31 years. International Journal of Obesity, 28, 775-782. doi:10.1038/sj.ijo.0802622
 ACT Inc. (2004) Average national ACT score rises for first time since 1997, but many students still not ready for college science and math courses. Iowa City. http://www.act.org/news/releases/2004/8-18-04.html
 Martin, S.B., Morrow Jr., J.R., Jackson, A.W. and Dunn, A.L. (2000) Variables related to meeting the CDC/ACSM physical activity guidelines. Medicine & Science in Sports & Exercise, 32, 2087-2092. doi:10.1097/00005768-200012000-00019