1.Flodmark, CE, Lissau, I, Moreno, LA, Pietrobelli, A & Widhalm, K (2004) New insights into the field of children and adolescents’ obesity: the European perspective. Int J Obes Relat Metab Disord 28, 1189–1196.
2.Moreno, LA, Mesana, MI, Fleta, J, Ruiz, JR, González-Gross, M, Sarría, A, Marcos, A & Bueno, M; AVENA Study Group (2005) Overweight, obesity and body fat composition in Spanish adolescents. The AVENA Study. Ann Nutr Metab 49, 71–76.
3.Aranceta, J, Pérez-Rodrigo, C, Serra-Majem, L, Bellido, D, de la Torre, ML, Formiguera, X & Moreno, B (2007) Prevention of overweight and obesity: a Spanish approach. Public Health Nutr 10, 1187–1193.
4.Ballesteros Arribas, JM, Dal-Re Saavedra, M, Pérez-Farinós, N & Villar Villalba, C (2007) The Spanish strategy for nutrition, physical activity and the prevention of obesity (NAOS Strategy). Rev Esp Salud Publica 81, 443–449.
5.Singh, AS, Mulder, C, Twisk, JW, van Mechelen, W & Chinapaw, MJ (2008) Tracking of childhood overweight into adulthood: a systematic review of the literature. Obes Rev 9, 474–488.
6.World Health Organization (2003) Diet, Nutrition and the Prevention of Chronic Diseases. Report of a Joint WHO/FAO Expert Consultation. WHO Technical Report Series no. 916. Geneva: WHO.
7.World Health Organization (2004) Global Strategy on Diet, Physical Activity and Health. Geneva: WHO.
8.Henríquez Sánchez, P, Doreste Alonso, J, Laínez Sevillano, P, Estévez González, MD, Iglesias Valle, M, Martín López, G, Sosa Iglesias, I & Serra Majem, L (2008) Prevalence of obesity and overweight in adolescents from Canary Islands, Spain. Relationship with breakfast and physical activity. Med Clin (Barc) 130, 606–610.
9.García-Artero, E, Ortega, FB, Ruiz, JR, Mesa, JL, Delgado, M, González-Gross, M, García-Fuentes, M, Vicente-Rodríguez, G, Gutiérrez, A & Castillo, MJ (2007) Lipid and metabolic profiles in adolescents are affected more by physical fitness than physical activity (AVENA study). Rev Esp Cardiol 60, 581–588.
10.Serra-Majem, L, Aranceta Bartrina, J, Pérez-Rodrigo, C, Ribas-Barba, L & Delgado-Rubio, A (2006) Prevalence and determinants of obesity in Spanish children and young people. Br J Nutr 96, Suppl. 1, S67–S72.
11.Sirard, JR & Pate, RR (2001) Physical activity assessment in children and adolescents. Sports Med 31, 439–454.
12.Simonen, RL, Perusse, L, Rankinen, T, Rice, T, Rao, DC & Bouchard, C (2002) Familial aggregation of physical activity levels in the Québec Family Study. Med Sci Sports Exerc 34, 1137–1142.
13.Wickel, EE & Eisenmann, JC (2006) Within- and between-individual variability in estimated energy expenditure and habitual physical activity among young adults. Eur J Clin Nutr 60, 538–544.
14.Eisenmann, JC & Wickel, EE (2007) Estimated energy expenditure and physical activity patterns of adolescent distance runners. Int J Sport Nutr Exerc Metab 17, 178–188.
15.Jago, R, Anderson, CB, Baranowski, T & Watson, K (2005) Adolescent patterns of physical activity differences by gender, day, and time of day. Am J Prev Med 28, 447–452.
16.Hart, JW, Bremner, AR, Wootton, SA & Beattie, RM (2005) Measured versus predicted energy expenditure in children with inactive Crohn’s disease. Clin Nutr 24, 1047–1055.
17.LaMonte, MJ, Ainsworth, BE & Tudor-Locke, C (2003) Assessment of physical activity and energy expenditure. In Obesity: Etiology, Assessment, Treatment and Prevention, pp. 111–140 [RE Andersen, editor]. Champaign, IL: Human Kinetics.
18.Matthews, CE (2002) Use of self-report instruments to assess physical activity. In Physical Activity Assessment in Health Related Research, pp. 108–121 [GJ Welk, editor]. Champaign, IL: Human Kinetics.
19.Ruiz, JR, Rizzo, NS, Hurtig-Wennlöf, A, Ortega, FB, Wärnberg, J & Sjöström, M (2006) Relations of total physical activity and intensity to fitness and fatness in children: the European Youth Heart Study. Am J Clin Nutr 84, 299–303.
20.Rizzo, NS, Ruiz, JR, Hurtig-Wennlöf, A, Ortega, FB & Sjöström, M (2007) Relationship of physical activity, fitness, and fatness with clustered metabolic risk in children and adolescents: the European Youth Heart Study. J Pediatr 150, 388–394.
21.Strong, WB, Malina, RM, Blimkie, CJ et al. (2005) Evidence based physical activity for school-age youth. J Pediatr 146, 732–737.
22.Bouchard, C, Tremblay, A, Leblanc, C, Lortie, G, Savard, R & Thériault, G (1983) A method to assess energy expenditure in children and adults. Am J Clin Nutr 37, 461–467.
23.Bratteby, LE, Sandhagen, B, Fan, H & Samuelson, G (1996) A seven day activity diary for assessment of daily energy expenditure validated by the doubly labeled water method. Eur J Clin Nutr 50, 284–289.
24.Ekelund, U, Yngve, A & Sjöström, M (1999) Total daily energy expenditure and patterns of physical activity in adolescents assessed by two different methods. Scand J Med Sci Sports 9, 257–264.
25.Pate, RR, Ross, R, Dowda, M, Trost, SG & Sirard, JR (2003) Validation of a 3-day physical activity recall instrument in female youth. Pediatr Exerc Sci 15, 257–265.
26.Janz, KF, Lutuchy, EM, Wenthe, P & Levy, SM (2008) Measuring activity in children and adolescents using self-report: PAQ-C and PAQ-A. Med Sci Sports Exerc 40, 767–772.
27.Wong, SL, Leatherdale, ST & Manske, SR (2006) Reliability and validity of a school-based physical activity questionnaire. Med Sci Sports Exerc 38, 1593–1600.
28.Hagströmer, M, Oja, P & Sjöström, M (2006) The International Physical Activity Questionnaire (IPAQ): a study of concurrent and construct validity. Public Health Nutr 9, 755–762.
29.Craig, CL, Marshall, AL, Sjöström, M et al. (2003) International physical activity questionnaire: 12-country reliability and validity. Med Sci Sports Exerc 35, 1381–1395.
30.Yore, MM, Ham, SA, Ainsworth, BE, Kruger, J, Reis, JP, Kohl, HW 3rd & Macera, CA (2007) Reliability and validity of the instrument used in BRFSS to assess physical activity. Med Sci Sports Exerc 39, 1267–1274.
31.Puyau, MR, Adolph, AL, Vohra, FA & Butte, NF (2002) Validation and calibration of physical activity monitors in children. Obes Res 10, 150–157.
32.Trost, SG, Ward, DS, Morread, SM, Watson, PD, Riner, W & Burke, J (1998) Validity of the Computer Science and Applications (CSA) activity monitor in children. Med Sci Sports Exerc 30, 629–633.
33.Ekelund, U, Sjöström, M, Yngve, A, Poortvliet, E, Nilsson, A, Froberg, K, Wedderkopp, N & Westerterp, K (2001) Physical activity assessed by activity monitor and doubly labeled water in children. Med Sci Sports Exerc 33, 275–281.
34.Trost, SG, Way, R & Okely, AD (2006) Predictive validity of three ActiGraph energy expenditure equations for children. Med Sci Sports Exerc 38, 380–387.
35.Andersen, LB, Harro, M, Sardinha, LB, Froberg, K, Ekelund, U, Brage, S & Anderssen, SA (2006) Physical activity and clustered cardiovascular risk in children: a cross-sectional study (The European Youth Heart Study). Lancet 368, 299–304.
36.Brage, S, Wedderkopp, N, Anderson, LB & Froberg, K (2003) Influence of step frequency on movement intensity predictions with the CSA accelerometer: a field validation study in children. Pediatr Exerc Sci 15, 277–287.
37.Bland, JM & Altman, DG (1986) Statistical methods for assessing agreement between two methods of clinical measurement. Lancet 1, 307–310.
38.Cohen, J (1960) A coefficient of agreement for nominal scales. Educ Psychol Meas 20, 37–46.
39.Landis, JR & Koch, GG (1977) The measurement of observer agreement for categorical data. Biometrics 33, 159–174.
40.Wickel, EE, Welk, GJ & Eisenmann, JC (2006) Concurrent validation of the Bouchard diary with an accelerometry-based monitor. Med Sci Sports Exerc 38, 373–379.
41.Ridley, K, Ainsworth, BE & Olds, TS (2008) Development of a compendium of energy expenditures for youth. Int J Behav Nutr Phys Act 5, 45.
42.Nader, PR, Bradley, RH, Houts, RM, McRitchie, SL & O’Brien, M (2008) Moderate-to-vigorous physical activity from ages 9 to 15 years. JAMA 300, 295–305.
43.Rowlands, AV, Pilgrim, EL & Eston, RG (2008) Patterns of habitual activity across weekdays and weekend days in 9–11-year-old children. Prev Med 46, 317–324.
44.Aires, L, Santos, R, Silva, P, Santos, P, Oliveira, J, Ribeiro, JC, Rego, C & Mota, J (2007) Daily differences in patterns of physical activity among overweight/obese children engaged in a physical activity program. Am J Hum Biol 19, 871–877.
45.Trost, SG, McIver, KL & Pate, RR (2005) Conducting accelerometer-based activity assessments in field-based research. Med Sci Sports Exerc 37, 11 Suppl., S531–S543.
46.Schmidt, MD, Freedson, PS & Chasan-Taber, L (2003) Estimating physical activity using the CSA accelerometer and a physical activity log. Med Sci Sports Exerc 35, 1605–1611.
47.Anderson, CB, Hagströmer, M & Yngve, A (2005) Validation of the PDPAR as an adolescent diary: effect of accelerometer cut points. Med Sci Sports Exerc 37, 1224–1230.
48.Guinhouya, CB, Hubert, H, Soubrier, S, Vilhelm, C, Lemdani, M & Durocher, A (2006) Moderate-to-vigorous physical activity among children: discrepancies in accelerometry-based cut-off points. Obesity (Silver Spring) 14, 774–777.