Patrick, K., Norman, G.J., Calfas, K.J., Sallis, J.F., Zabinski, M.F., Rupp, J. and Cella, J. (2004) Diet, physical activity, and sedentary behaviors as risk factors for overweight in adolescence. Archives of Pediatrics and Adolescent Medicine, 158, 385-390. http://dx.doi.org/10.1001/archpedi.158.4.385
 Gortmaker, S.L., Must, A., Sobol, A.M., Peterson, K., Colditz, G.A. and Dietz, W.H. (1996) Television viewing as a cause of increasing obesity among children in the united states, 1986-1990. Archives of Pediatrics and Adolescent Medicine, 150, 356-362. http://dx.doi.org/10.1001/archpedi.1996. 02170290022003
 Saris, W.H., Blair, S.N., van Baak, M.A., Eaton, S.B., Davies, P.S., Di Pietro L., et al. (2003) How much physical activity is enough to prevent unhealthy weight gain? Outcome of the IASO 1st Stock Conference and consensus statement. Obesity Reviews, 4, 101-114. http://dx.doi.org/10. 1046/j.1467-789X.2003.00101.x
 Livingstone, M.B.E., Robson, P.J., Wallace, J.M.W. and McKinley, M.C. (2003) How active are we? Levels of routine physical activity in children and adults. Proceedings of the Nutrition Society, 62, 681-701. http://dx.doi.org/10.1079/PNS2003291
 Klesges, L.M. and Klesges, R.C. (1987) The assessment of children’s physical-activity—A comparison of methods. Medicine & Science in Sports & Exercise, 19, 511-517. http://dx.doi.org/10.1249/ 00005768 -198710000-00015
 Going, S.B., Levin, S., Harrell, J., Stewart, D., Kushi, L., Cornell, C.E., et al. (1999) Physical activity assessment in American Indian schoolchildren in the Pathways study. American Journal of Clinical Nutrition, 69, 788S-795S.
 Jackson, D.M., Reilly, J.J., Kelly, L.A., Montgomery, C., Grant, S. and Paton, J.Y. (2003) Objectively measured physical activity in a representative sample of 3-to 4-year-old children. Obesity Research, 11, 420-425. http://dx.doi.org/10.1038/oby.2003.57
 Welk, G.J. and Corbin, C.B. (1995) The validity of the Tritrac-R3d activity monitor for the assessment of physical activity in children. Research Quarterly for Exercise and Sport, 66, 202-209. http://dx.doi.org/10.1080/02701367.1995.10608834
 Finn, K.J. and Specker, B. (2000) Comparison of actiwatch (R) activity monitor and children’s activity rating scale in children. Medicine & Science in Sports & Exercise, 32, 1794-1797.
 Melanson, E.L. and Freedson, P.S. (1995) Validity of the computer-science and applications, Inc. (Csa) activity monitor. Medicine & Science in Sports & Exercise, 27, 934-940.
 Sugimoto, A., Hara, Y., Findley, T.W. and Yonemoto, K. (1997) A useful method for measuring daily physical activity by a three-direction monitor. Scandinavian Journal of Rehabilitation Medicine, 29, 37-42.
 Puyau, M.R., Adolph, A.L., Vohra, F.A. and Butte, N.F. (2002) Validation and calibration of physical activity monitors in children. Obesity Research, 10, 150-157. http://dx.doi.org/10.1038/oby.2002.24
 Puhl, J., Greaves, K., Hoyt, M. and Baranowski, T. (1990) Children’s activity rating-scale (Cars)—Description and calibration. Research Quarterly for Exercise and Sport, 61, 26-36.
 Reilly, J.J., Coyl, J., Kelly, L., Burke, G., Grant, S. and Paton, J.Y. (2003) An objective method for measurement of sedentary behavior in 3-to 4-year olds. Obesity Research, 11, 1155-1158. http://dx.doi.org/10.1038/oby.2003.158
 Nilsson, A., Ekelund, U., Yngve, A. and Sjostrom, M. (2002) Assessing physical activity among children with accelerometers using different time sampling intervals and placements. Pediatric Exercise Science, 14, 87-96.
 Eston, R.G., Rowlands, A.V. and Ingledew, D.K. (1998) Validity of heart rate, pedometry, and accelerometry for predicting the energy cost of children’s activities. Journal of Applied Physiology, 84, 362-371.
 Bray, M.S., Wong, W.W., Morrow, J.R., Butte, N.F. and Pivarnik, J.M. (1994) Caltrac versus calorimeter determination of 24-H energy expenditure in female children and adolescents. Medicine and Science in Sports and Exercise, 26, 1524-1530. http://dx.doi.org/10.1249/00005768-199412000-00017