Baranowski, T., Thompson, W.O., Durant, R.H., Baranowski, J. and Puhl, J. (1993) Observations on physical activity in physical locations: age, gender, ethnicity, and month effects. Research Quarterly for Exercise and Sport 64, 127-133.

Berkey, C.S., Rockett, H.R., Gillman, M.W. and Colditz, G.A. (2003) One-year changes in activity and in inactivity among 10- to 15-year-old boys and girls: relationship to change in body mass index. Pediatrics 111, 836-843.

Bouchard, C., Shephard, R. and Stephens, T. (1994) The consensus Statement. In: Exercise, Fitness and Health: A Consensus of Current Knowledge. Ed: Stephens, C.B.R.S.T. Champaign. IL, Human Kinetics.

Cavill, N., Biddle, S. and Sallis, J. (2001) Health Enhancing Physical Activity for Young People: Statement of the United Kingdom Expert Consensus Conference. Pediatric Exercise Science 13, 12-25.

Chan, C.B. and Ryan, D.A. (2009) Assessing the effects of weather conditions on physical activity participation using objective measures. International Journal of Environmental Research and Public Health 6, 2639-2654.

Chan, C.B., Ryan, D.A. and Tudor-Locke, C. (2006) Relationship between objective measures of physical activity and weather: a longitudinal study. International Journal of Behavioral Nutrition and Physical Activity 3, 21.

Dietz, W.H., Jr. and Gortmaker, S.L. (1984) Factors within the physical environment associated with childhood obesity. American Journal of Clinical Nutrition 39, 619-624.

Dishman, R.K., Motl, R.W., Saunders, R., Felton, G., Ward, D.S., Dowda, M. and Pate, R.R. (2004) Self-efficacy partially mediates the effect of a school-based physical-activity intervention among adolescent girls. Preventive Medicine 38, 628-636.

Esliger, D.W., Copeland, J.L., Barnes, J.D. and Tremblay, M.S. (2005) Standardizing and Optimizing the Use of Accelerometer Data for Free-Living Physical Activity Monitoring. Journal of Physical Activity and Health 2, 366-383.

Fisher, A., Reilly, J.J., Montgomery, C., Kelly, L., Williamson, A., Jackson, D.M., Paton, J.Y. and Grant, S. (2005) Seasonality in physical activity and sedentary behavior in young children. Pediatric Exercise Science 17, 31-40.

Gordon-Larsen, P., Mcmurray, R.G. and Popkin, B.M. (2000) Determinants of adolescent physical activity and inactivity patterns. Pediatrics 105, E83.

Hill, J.O. and Melanson, E.L. (1999) Overview of the determinants of overweight and obesity: current evidence and research issues.Medicine and Science in Sports and Exercise 31, S515-521.

Irwin, J.D., He, M., Sangster Bouck, L.M., Tucker, P. and Pollett, G.L. (2005) Preschoolers' physical activity behaviours: Parent's perspectives. Canadian Journal of Public Health 96, 299-303.

Kahn, J.A., Huang, B., Gillman, M.W., Field, A.E., Austin, S B., Colditz, G.A. and Frazier, A.L. (2008) Patterns and determinants of physical activity in U.S. adolescents. Journal of Adolescent Health 42, 369-377.

Kolle, E., Steene-Johannessen, J., Andersen, L.B. and Anderssen, S.A. (2009) Seasonal variation in objectively assessed physical activity among children and adolescents in Norway: a cross-sectional study International Journal of Behavioral Nutrition and Physical Activity 6, 36.

Loucaides, C.A., Chedzoy, S.M. and Bennett, N. (2004) Differences in physical activity levels between urban and rural school children in Cyprus. Health Education Research 19, 138-147.

Matthews, C.E., Chen, K.Y., Freedson, P.S., Buchowski, M.S., Beech, B.M., Pate, R.R. and Troiano, R.P. (2008) Amount of time spent in sedentary behaviors in the United States, 2003-2004. American Journal of Epidemiology 167, 875-881.

Mattocks, C., Leary, S., Ness, A., Deere, K., Saunders, J., Kirkby, J., Blair, S. N., Tilling, K. and Riddoch, C. (2007) Intraindividual variation of objectively measured physical activity in children. Medicine and Science in Sports and Exercise 39, 622-629.

Merrill, R.M., Shields, E.C., White, G.L.,Jr. and Druce, D. (2005) Climate conditions and physical activity in the United States. American Journal of Health Behavior 29, 371-381.

Mota, J., Santos, P., Guerra, S., Ribeiro, J.C. and Duarte, J.A. (2003) Patterns of daily physical activity during school days in children and adolescents. American Journal of Human Biology 15(4), 547-553

Owen, N., Leslie, E., Salmon, J. and Fotheringham, M.J. (2000) Environmental determinants of physical activity and sedentary behavior. Exercise and Sport Sciences Reviews 28, 153-158.

Pate, R.R., Trost, S.G., Felton, G.M., Ward, D.S., Dowda, M. and Saunders, R. (1997) Correlates of physical activity behavior in rural youth. Research Quarterly for Exercise and Sport 68, 241-248.

Plasqui, G. and Westerterp, K.R. (2004) Seasonal variation in total energy expenditure and physical activity in Dutch young adults. Obesity Research 12, 688-694.

Riddoch, C.J., Mattocks, C., Deere, K., Saunders, J., Kirkby, J., Tilling, K., Leary, S.D., Blair, S.N. and Ness, A.R. (2007) Objective measurement of levels and patterns of physical activity. Archives of Disease in Childhood 92, 963-969.

Rowlands, A.V., Pilgrim, E.L. and Eston, R.G. (2009) Seasonal changes in children's physical activity: an examination of group changes, intra-individual variability and consistency in activity pattern across season. Annals of Human Biology 36, 363-378.

Sallis, J.F., Bauman, A. and Pratt, M. (1998) Environmental and policy interventions to promote physical activity. American Journal of Preventive Medicine 15, 379-397.

Sallis, J.F., Kraft, K. and Linton, L.S. (2002) How the environment shapes physical activity: a transdisciplinary research agenda. American Journal of Preventive Medicine 22, 208.

Sallis J.F. and Owen, N. (1999) Physical Activity & Behavioral Medicine. Sage Publications.

Sallis, J.F., Prochaska, J.J. and Taylor, W.C. (2000) A review of correlates of physical activity of children and adolescents. Medicine and Science in Sports and Exercise 32, 963-975.

Sallis, J.F., Nader, P.R., Broyles, S.L., Berry, C.C., Elder, J.P., Mckenzie, T.L. and Nelson, J.A. (1993) Correlates of physical activity at home in Mexican-American and Anglo-American preschool children. Health Psychology 12, 390-398.

Santos, M.P., Matos, M. and Mota, J. (2005) Seasonal variations in portuguese adolescents’ organized and nonorganized physical activities. Pediatric Exercise Science 17, 390-398.

Shephard, R.J. and Aoyagi, Y. (2009) Seasonal variations in physical activity and implications for human health. European Journal of Applied Physiology, 107, 251-271.

Troiano, R.P. (2005) A timely meeting: objective measurement of physical activity. Medicine and Science in Sports and Exercise 37, S487-489.

Troiano, R.P., Berrigan, D., Dodd, K.W., Masse, L.C., Tilert, T. and Mcdowell, M. (2008) Physical activity in the United States measured by accelerometer. Medicine and Science in Sports and Exercise 40, 181-188.

Trost, S.G., Pate, R.R., Freedson, P.S., Sallis, J.F. and Taylor, W.C. (2000) Using objective physical activity measures with youth: how many days of monitoring are needed? Medicine and Science in Sports and Exercise 32, 426-431.

Trost, S.G., Pate, R.R., Sallis, J.F., Freedson, P.S., Taylor, W.C., Dowda, M. and Sirard, J. (2002) Age and gender differences in objectively measured physical activity in youth. Medicine and Science in Sports and Exercise 34, 350-355.

Trost, S.G., Way, R. and Okely, A.D. (2006) Predictive validity of three ActiGraph energy expenditure equations for children. Medicine and Science in Sports and Exercise 38, 380-387.

Trudeau, F. and Shephard, R.J. (2008) Physical education, school physical activity, school sports and academic performance. International Journal of Behavioral Nutrition and Physical Activity 5, 10.

Tucker, P. and Gilliland, J. (2007) The effect of season and weather on physical activity: a systematic review. Public Health 121, 909-922.

Tucker, P., Irwin, J.D., Sangster Bouck, L.M., He, M. and Pollett, G. (2006) Preventing paediatric obesity; recommendations from a community-based qualitative investigation. Obesity Reviews 7, 251-260.