title: Reliable lower limb musculoskeletal profiling using easily operated, portable equipment.
abstract: OBJECTIVE
  Jumping performance and movement-based screening tests are commonly performed on athletes pre-season. Little is known regarding the test-retest reliability of performance tests and associated movement patterns using easily operated, portable and cost effective equipment. The purpose of this study was to establish the test-retest reliability of performance and video-derived movement characteristics of six screening tests measured simultaneously using a contact mat and two-dimensional video analysis.
  
  
  METHODS
  Twenty-four subjects (17 male/7 female) were tested on three occasions 5-12 days apart to establish test-retest reliability of the measurement tools used. The tests used were anterior step-up, double and single-leg countermovement jumps, double and single-leg reactive (drop) jumps, and single-leg side springs.
  
  
  RESULTS
  Measures of performance demonstrated less variability (mean-typical error expressed as a coefficient of variation, CV 2.8-4.3%) and higher reliability (intraclass correlation coefficients, ICC 0.98-0.99) for floor-based tests (preceding values) than drop tests (CV 10.3-13.2%, ICC 0.83-0.85). All video-derived movement characteristics demonstrated low variability (CV 3.2-4.8%), but lower rank order repeatability (ICC 0.43-0.79).
  
  
  CONCLUSIONS
  The findings suggest that screening tests performed from the floor and measured simultaneously using a contact mat and two-dimensional movement analysis are reliable, and trialling these tests for the pre-season screening of athletes is supported.
authors.affiliation: School of Biomedical Sciences, University of Newcastle, Callaghan, NSW 2308, Australia. andrew.miller@newcastle.edu.au
authors.forename: Andrew
authors.initials: A
authors.lastname: Miller
authors.forename: Robin
authors.initials: R
authors.lastname: Callister
mesh_terms: D054874:Athletic Performance / Q000502:physiology*; D003627:Data Interpretation, Statistical; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D007866:Leg / Q000502:physiology*; D008297:Male; D015203:Reproducibility of Results; D055815:Young Adult