title: Reliability and validity of data for 2 newly developed shuttle run tests in children with cerebral palsy.
abstract: OBJECTIVE
  The purpose of this study was to examine the reliability and validity of data obtained with 2 newly developed shuttle run tests (SRT-I and SRT-II) to measure aerobic power in children with cerebral palsy (CP) who were classified at level I or II on the Gross Motor Function Classification System (GMFCS). The SRT-I was developed for children at GMFCS level I, and the SRT-II was developed for children at GMFCS level II.
  
  
  METHODS
  Twenty-five children and adolescents with CP (10 female, 15 male; mean age = 11.9 years, SD = 2.9), classified at GMFCS level I (n = 14) or level II (n = 11), participated in the study.
  
  
  METHODS
  To assess test-retest reliability of data for the 10-m shuttle run tests, the subjects performed the same test within 2 weeks. To examine validity, the shuttle run tests were compared with a GMFCS level-based treadmill test designed to measure peak oxygen uptake.
  
  
  RESULTS
  Statistical analyses revealed test-retest reliability for exercise time (number of levels completed) (intraclass correlation coefficients of .97 for the SRT-I and .99 for the SRT-II) and reliability for peak heart rate attained during the final level (intraclass correlation coefficients of .87 for the SRT-I and .94 for the SRT-II). High correlations were found for the relationship between data for both shuttle run tests and data for the treadmill test (r = .96 for both).
  
  
  CONCLUSIONS
  The results suggest that both 10-m shuttle run tests yield reliable and valid data. Moreover, the shuttle run tests have advantages over a treadmill test for children with CP who are able to walk and run (GMFCS level I or II).
authors.affiliation: Centre of Excellence, Rehabilitation Centre De Hoogstraat, Rembrandtkade 10, 3583 TM Utrecht, the Netherlands. o.verschuren@dehoogstraat.nl
authors.forename: Olaf
authors.initials: O
authors.lastname: Verschuren
authors.forename: Tim
authors.initials: T
authors.lastname: Takken
authors.forename: Marjolijn
authors.initials: M
authors.lastname: Ketelaar
authors.forename: Jan W
authors.initials: JW
authors.lastname: Gorter
authors.forename: Paul J M
authors.initials: PJ
authors.lastname: Helders
mesh_terms: D000293:Adolescent; D002547:Cerebral Palsy / Q000503:physiopathology*; D002648:Child; D019988:Children with Disabilities; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D016014:Linear Models; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*