title: Physical activity and health related physical fitness in children with juvenile idiopathic arthritis.
abstract: OBJECTIVE
  To obtain insight into the interaction between daily physical activity and components of health related physical fitness in children with juvenile idiopathic arthritis.
  
  
  METHODS
  Forty five patients (10 male/35 female; mean (SD) age 8.9 (2.2) years) participated in the study. Body mass, height, skinfold thickness, number of swollen joints, and joint range of motion were determined. The maximal oxygen consumption (VO(2peak)) was assessed during a graded maximal bicycle exercise test. Daily physical activity levels were measured with a Caltrac activity monitor and a parental physical activity rating (PAL) on a five point Likert scale.
  
  
  RESULTS
  Partial correlation coefficients (to control for age) between physical activity and indices of health related physical fitness showed significant relationships between Caltrac motion counts and absolute VO(2peak) (r=0.31) and relative VO(2peak) (r=0.34), but not with the indices of body composition. There was also a significant correlation between PAL and relative VO(2peak) (r=0.33).
  
  
  CONCLUSIONS
  Physical activity was significantly related to cardiorespiratory fitness but not to body composition in children with juvenile idiopathic arthritis. A longitudinal follow up should show whether an active lifestyle protects for loss of aerobic fitness in this patient group.
authors.affiliation: Department of Paediatric Physical Therapy, University Hospital for Children and Youth Het Wilhelmina Kinderziekenhuis, University Medical Centre Utrecht, Utrecht, The Netherlands.
authors.forename: T
authors.initials: T
authors.lastname: Takken
authors.forename: J
authors.initials: J
authors.lastname: van der Net
authors.forename: W
authors.initials: W
authors.lastname: Kuis
authors.forename: P J M
authors.initials: PJ
authors.lastname: Helders
mesh_terms: D000375:Aging / Q000502:physiology; D000886:Anthropometry; D001171:Arthritis, Juvenile / Q000503:physiopathology*; D002648:Child; D003430:Cross-Sectional Studies; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D010101:Oxygen Consumption; D010809:Physical Fitness; D016059:Range of Motion, Articular