title: Reliability of the Fox-walk test in patients with rheumatoid arthritis.
abstract: OBJECTIVE
  The Fox-walk test is a new method used to estimate aerobic capacity outside a clinical environment, which may be useful in the implementation of daily health-enhancing physical activity. The aim of our study was to investigate the reliability of the test in people with rheumatoid arthritis (RA).
  
  
  METHODS
  Fifteen participants performed the Fox-walk test three times with weekly intervals. The intraclass correlation coefficient (ICC), the standard error of measurement (SEM) and the smallest detectable change (SDC) were used to estimate the reliability. General health perception, lower limb pain and fatigue were measured to determine their potential influence on the reliability.
  
  
  RESULTS
  There were no systematic differences between the three test occasions (p = 0.190) and the reliability was almost perfect (ICC = 0.982). None of the covariates influenced the reliability. The SEM was 0.999 ml/kg/min or 3.4% and the SDC was 2.769 ml/kg/min or 9.4%.
  
  
  CONCLUSIONS
  These findings demonstrate that the Fox-walk test is reliable in people with RA and enables differentiation between people with RA and monitoring progress. The validity of the test among people with RA is still to be determined.
  
  
  CONCLUSIONS
  • The Fox-walk test is a new method to estimate aerobic capacity and could be performed walking or running. • The test is self administered without expensive equipment and is available in 150 public places in Sweden and several other European countries. • The Fox-walk test is a reliable test for use among people with rheumatoid arthritis monitoring the progress of their physical activity.
authors.affiliation: University Medical Centre St . Radboud, Nijmegen, the Netherlands.
authors.forename: Cornelia Antonia
authors.initials: CA
authors.lastname: Verberkt
authors.forename: Cecilia
authors.initials: C
authors.lastname: Fridén
authors.forename: Wilhelmus Johannes Andreas
authors.initials: WJ
authors.lastname: Grooten
authors.forename: Christina H
authors.initials: CH
authors.lastname: Opava
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000503:physiopathology*; D004185:Disability Evaluation; D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D010101:Oxygen Consumption; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D016138:Walking