• 1
    Arkela-Kautiainen M, Haapasaari J, Kautiainen H, Vilkkumaa I, Malkia E, Leirisalo-Repo M. Favourable social functioning and health related quality of life of patients with JIA in early adulthood. Ann Rheum Dis 2005; 64: 87580.
  • 2
    Foster HE, Marshall N, Myers A, Dunkley P, Griffiths ID. Outcome in adults with juvenile idiopathic arthritis: a quality of life study. Arthritis Rheum 2003; 48: 76775.
  • 3
    Minden K, Niewerth M, Listing J, Biedermann T, Bollow M, Schontube M, et al. Long-term outcome in patients with juvenile idiopathic arthritis. Arthritis Rheum 2002; 46: 2392401.
  • 4
    Packham JC, Hall MA. Long-term follow-up of 246 adults with juvenile idiopathic arthritis: functional outcome. Rheumatology (Oxford) 2002; 41: 142835.
  • 5
    Shaw KL, Southwood TR, McDonagh JE, for the British Paediatric Rheumatology Group. User perspectives of transitional care for adolescents with juvenile idiopathic arthritis. Rheumatology (Oxford) 2004; 43: 7708.
  • 6
    Singsen BH. Physical fitness in children with juvenile rheumatoid arthritis and other chronic pediatric illnesses. Pediatr Clin North Am 1995; 42: 103550.
  • 7
    Biddle S, Sallis JF, Cavill N. Young and active? Young people and health-enhancing physical activity: evidence and implications. London: Health Education Authority; 1998.
  • 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
    Bar-Or O. Clinical implications of pediatric exercise physiology [review]. Ann Clin Res 1982; 14 Suppl 34: 97106.
  • 11
    Carnethon MR, Gidding SS, Nehgme R, Sidney S, Jacobs DR Jr, Liu K. Cardiorespiratory fitness in young adulthood and the development of cardiovascular disease risk factors. JAMA 2003; 290: 3092100.
  • 12
    NIH Consensus Development Panel on Physical Activity and Cardiovascular Health. Physical activity and cardiovascular health [review]. JAMA 1996; 276: 2416.
  • 13
    Tell GS, Vellar OD. Physical fitness, physical activity, and cardiovascular disease risk factors in adolescents: the Oslo Youth Study. Prev Med 1988; 17: 1224.
  • 14
    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.
  • 15
    Takken T, van der Net J, Helders PJ. Relationship between functional ability and physical fitness in juvenile idiopathic arthritis patients. Scand J Rheumatol 2003; 32: 1748.
  • 16
    Klepper SE, Darbee J, Effgen SK, Singsen BH. Physical fitness levels in children with polyarticular juvenile rheumatoid arthritis. Arthritis Care Res 1992; 5: 93100.
  • 17
    Malleson PN, Oen K, Cabral DA, Petty RE, Rosenberg AM, Cheang M. Predictors of pain in children with established juvenile rheumatoid arthritis. Arthritis Rheum 2004; 51: 2227.
  • 18
    Hofer M, Southwood TR. Classification of childhood arthritis [review]. Best Pract Res Clin Rheumatol 2002; 16: 37996.
  • 19
    Binkhorst RA, van 't Hof MA, Saris WH. Maximum exercise in children: reference values for girls and boys, 6 to 18 years of age. The Hague, The Netherlands: Dutch Heart Association; 1992. p. 164.
  • 20
    Gerver W, de Bruin R. Paediatric morphometrics reference manual. Maastricht: Maastricht University Press; 2001.
  • 21
    Cole TJ, Bellizzi MC, Flegal KM, Dietz WH. Establishing a standard definition for child overweight and obesity worldwide: international survey. BMJ 2000; 320: 12403.
  • 22
    Van Buuren S. Body-mass index cut-off values for underweight in Dutch children. Ned Tijdschr Geneeskd 2004; 148: 196772. In Dutch.
  • 23
    Bar-Or O. The Wingate Anaerobic Test: an update on methodology, reliability and validity. Sports Med 1987; 4: 38194.
  • 24
    Lode BV. Operator manual for Wingate for Windows software. Auckland, New Zealand: Qbik New Zealand Ltd.; 2003.
  • 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. The Dutch version of the Childhood Health Assessment Questionnaire (CHAQ) and the Child Health Questionnaire (CHQ). Clin Exp Rheumatol 2001; 19 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
    Ainsworth BE, Haskell WL, Whitt MC, Irwin ML, Swartz AM, Strath SJ, et al. Compendium of physical activities: an update of activity codes and MET intensities. Med Sci Sports Exerc 2000; 32: S498504.
  • 30
    Van Brussel M, Lelieveld OT, van der Net J, Engelbert RH, Helders PJ, Takken T. Aerobic and anaerobic exercise capacity in children with juvenile idiopathic arthritis. Arthritis Rheum 2007; 57: 8917.
  • 31
    Bar-Or O. Pathophysiological factors which limit the exercise capacity of the sick child. Med Sci Sports Exerc 1986; 18: 27682.
  • 32
    Klepper SE. Exercise and fitness in children with arthritis: evidence of benefits for exercise and physical activity. Arthritis Rheum 2003; 49: 43543.
  • 33
    Bailey RC, Olson J, Pepper SL, Porszasz J, Barstow TJ, Cooper DM. The level and tempo of children's physical activities: an observational study. Med Sci Sports Exerc 1995; 27: 103341.
  • 34
    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 behaviour [published erratum appears in J Sch Health 1995;65:311]. J Sch Health 1995; 65: 2139.
  • 35
    Bar-Or O. Pediatric sports medicine for the practitioner. New York: Springer-Verlag; 1983.