• 1
    Hills AP, King NA, Armstrong TP. The contribution of physical activity and sedentary behaviours to the growth and development of children and adolescents: implications for overweight and obesity. Sports Med 2007; 37: 53345.
  • 2
    NIH Consensus Development Panel on Physical Activity and Cardiovascular Health. Physical activity and cardiovascular health. JAMA 1996; 276: 2416.
  • 3
    Burdette HL, Whitaker RC. Resurrecting free play in young children: looking beyond fitness and fatness to attention, affiliation, and affect. Arch Pediatr Adolesc Med 2005; 159: 4650.
  • 4
    Singsen BH. Physical fitness in children with juvenile rheumatoid arthritis and other chronic pediatric illnesses. Pediatr Clin North Am 1995; 42: 103550.
  • 5
    Bouchard C. Physical activity, fitness and health: overview of the Consensus Symposium. In: QuinneyHA, GauvinL, WallAE, editors. Toward active living. Champaign (IL): Human Kinetics Publishers; 1994.
  • 6
    Caspersen CJ, Powell KE, Christenson GM. Physical activity, exercise, and physical fitness: definitions and distinctions for health-related research. Public Health Rep 1985; 100: 12631.
  • 7
    Caspersen CJ. Physical activity epidemiology: concepts, methods and applications to exercise and science. Exerc Sport Sci Rev 1989; 17: 42373.
  • 8
    Henderson CJ, Lovell DJ, Specker BL, Campaigne BN. Physical activity in children with juvenile rheumatoid arthritis: quantification and evaluation. Arthritis Care Res 1995; 8: 1149.
  • 9
    Takken T, Hemel A, van der Net J, Helders PJ. Aerobic fitness in children with juvenile idiopathic arthritis: a systematic review. J Rheumatol 2002; 29: 26437.
  • 10
    Lelieveld OT, van Brussel M, Takken T, van Weert E, van Leeuwen MA, Armbrust W. Aerobic and anaerobic exercise capacity in adolescents with juvenile idiopathic arthritis. Arthritis Rheum 2007; 57: 898904.
  • 11
    Goran MI, Reynolds KD, Lindquist CH. Role of physical activity in the prevention of obesity in children. Int J Obes Relat Metab Disord 1999; 23 Suppl 3: S1833.
  • 12
    Twisk JW. Physical activity guidelines for children and adolescents: a critical review. Sports Med 2001; 31: 61727.
  • 13
    Strong WB, Malina RM, Blimkie CJ, Daniels SR, Dishman RK, Gutin B, et al. Evidence based physical activity for school-age youth. J Pediatr 2005; 146: 7327.
  • 14
    Pate RR. Physical activity assessment in children and adolescents. Crit Rev Food Sci Nutr 1993; 33: 3216.
  • 15
    Welk GJ, Corbin CB, Dale D. Measurement issues in the assessment of physical activity in children. Res Q Exerc Sport 2000; 71(2 Suppl ): S5973.
  • 16
    Human energy requirements: report of a joint FAO/WHO/UNU expert consultation. Proceedings of the Food and Nutrition Technical Support Series; 2001 Oct. 17–24; Rome, Italy. Rome: FAO; 2001. p. 410.
  • 17
    Ainsworth BE, Haskell WL, Leon AS, Jacobs DR Jr, Montoye HJ, Sallis JF, et al. Compendium of physical activities: classification of energy costs of human physical activities. Med Sci Sports Exerc 1993; 25: 7180.
  • 18
    Energy and protein requirements: report of a joint FAO/WHO/UNU Expert Consultation. World Health Organ Tech Rep Ser 1985; 724: 1206.
  • 19
    Hoos MB, Gerver WJ, Kester AD, Westerterp KR. Physical activity levels in children and adolescents. Int J Obes Relat Metab Disord 2003; 27: 6059.
  • 20
    Bouchard C, Tremblay A, Leblanc C, Lortie G, Savard R, Theriault G. A method to assess energy expenditure in children and adults. Am J Clin Nutr 1983; 37: 4617.
  • 21
    Schoeller DA. Recent advances from application of doubly labeled water to measurement of human energy expenditure. J Nutr 1999; 129: 17658.
  • 22
    Bratteby LE, Sandhagen B, Fan H, Samuelson G. A 7-day activity diary for assessment of daily energy expenditure validated by the doubly labelled water method in adolescents. Eur J Clin Nutr 1997; 51: 58591.
  • 23
    Hofer M, Southwood TR. Classification of childhood arthritis [review]. Best Pract Res Clin Rheumatol 2002; 16: 37996.
  • 24
    Schofield WN. Predicting basal metabolic rate, new standards and review of previous work. Hum Nutr Clin Nutr 1985; 39 Suppl 1: 541.
  • 25
    Singh G, Athreya BH, Fries JF, Goldsmith DP. Measurement of health status in children with juvenile rheumatoid arthritis. Arthritis Rheum 1994; 37: 17619.
  • 26
    Wulffraat N, van der Net JJ, Ruperto N, Kamphuis S, Prakken BJ, Ten Cate R, et al, for the Paediatric Rheumatology International Trials Organisation. The Dutch version of the Childhood Health Assessment Questionnaire (CHAQ) and the Child Health Questionnaire (CHQ). Clin Exp Rheumatol 2001; 19(4 Suppl 23 ): S1115.
  • 27
    Ruperto N, Martini A. International research networks in pediatric rheumatology: the PRINTO perspective. Curr Opin Rheumatol 2004; 16: 56670.
  • 28
    Cohen J. Statistical power analysis for the behavioral sciences. Hillsdale (NJ): Erlbaum; 1988.
  • 29
    Garcia AW, Broda MA, Frenn M, Coviak C, Pender NJ, Ronis DL. Gender and developmental differences in exercise beliefs among youth and prediction of their exercise behavior [published erratum appears in J Sch Health 1995;65:311]. J Sch Health 1995; 65: 2139.
  • 30
    Hallal PC, Victora CG, Azevedo MR, Wells JC. Adolescent physical activity and health: a systematic review. Sports Med 2006; 36: 101930.
  • 31
    Bandura A. Health promotion by social cognitive means. Health Educ Behav 2004; 31: 14364.
  • 32
    Srof BJ, Velsor-Friedrich B. Health promotion in adolescents: a review of Pender's health promotion model. Nurs Sci Q 2006; 19: 36673.
  • 33
    Klepper SE. Effects of an eight-week physical conditioning program on disease signs and symptoms in children with chronic arthritis. Arthritis Care Res 1999; 12: 5260.
  • 34
    Singh-Grewal D, Wright V, Bar-Or O, Feldman BM. Pilot study of fitness training and exercise testing in polyarticular childhood arthritis. Arthritis Rheum 2006; 55: 36472.
  • 35
    Singh-Grewal D, Schneiderman-Walker J, Wright V, Bar-Or O, Beyene J, Selvadurai H, et al. The effects of vigorous exercise training on physical function in children with arthritis: a randomized, controlled, single-blinded trial. Arthritis Rheum 2007; 57: 120210.
  • 36
    Takken T, van der Net J, Kuis W, Helders PJ. Aquatic fitness training for children with juvenile idiopathic arthritis. Rheumatology (Oxford) 2003; 42: 140814.
  • 37
    Westerterp KR. Pattern and intensity of physical activity. Nature 2001; 410: 539.
  • 38
    Biddle SJ, Gorely T, Stensel DJ. Health-enhancing physical activity and sedentary behaviour in children and adolescents. J Sports Sci 2004; 22: 679701.
  • 39
    Black AE, Coward WA, Cole TJ, Prentice AM. Human energy expenditure in affluent societies: an analysis of 574 doubly-labelled water measurements. Eur J Clin Nutr 1996; 50: 7292.
  • 40
    Westerterp KR. Alterations in energy balance with exercise. Am J Clin Nutr 1998; 68: 970S4S.
  • 41
    Magos AL. Effects and analysis of the menstrual cycle. J Biomed Eng 1988; 10: 1059.
  • 42
    Kishali NF, Imamoglu O, Katkat D, Atan T, Aykol P. Effects of menstrual cycle on sports performance. Int J Neurosci 2006; 116: 154963.