title: The reliability of biomechanical variables collected during single leg squat and landing tasks.
abstract: BACKGROUND
  The aim of this study was to determine the within- and between-day reliability of lower limb biomechanical variables collected during single leg squat (SLS) and single leg landing (SLL) tasks.
  
  
  METHODS
  15 recreational athletes took part in three testing sessions, two sessions on the same day and another session one week later. Kinematic and kinetic data was gathered using a ten-camera movement analysis system (Qualisys) and a force platform (AMTI) embedded into the floor.
  
  
  RESULTS
  The combined averages of within-day ICC values (ICCSLS=0.87; ICCSLL=0.90) were higher than between-days (ICCSLS=0.81; ICCSLL=0.78). Vertical GRF values (ICCSLS=0.90; ICCSLL=0.98) were more reliable than joint angles (ICCSLS=0.85; ICCSLL=0.82) and moments (ICCSLS=0.83; ICCSLL=0.87).
  
  
  CONCLUSIONS
  This study demonstrates that all joint angles, moments, and vertical ground reaction force (GRF) variables obtained during both tasks showed good to excellent consistency with relatively low standard error of measurement values. These findings would be of relevance to practitioners who are using such measures for screening and prospective studies of rehabilitative techniques.
authors.affiliation: Knee Biomechanics and Injury Research Programme, School of Health Sciences, University of Salford, Manchester, United Kingdom; General Directorate of Medical Rehabilitation, Ministry of Health, Riyadh, Saudi Arabia. Electronic address: F.S.Alenezi@edu.salford.ac.uk.
authors.forename: Faisal
authors.initials: F
authors.lastname: Alenezi
authors.affiliation: Knee Biomechanics and Injury Research Programme, School of Health Sciences, University of Salford, Manchester, United Kingdom.
authors.forename: Lee
authors.initials: L
authors.lastname: Herrington
authors.affiliation: Knee Biomechanics and Injury Research Programme, School of Health Sciences, University of Salford, Manchester, United Kingdom.
authors.forename: Paul
authors.initials: P
authors.lastname: Jones
authors.affiliation: Knee Biomechanics and Injury Research Programme, School of Health Sciences, University of Salford, Manchester, United Kingdom.
authors.forename: Richard
authors.initials: R
authors.lastname: Jones
mesh_terms: D000328:Adult; D056352:Athletes; D001696:Biomechanical Phenomena; D003625:Data Collection / Q000379:methods; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007596:Joints / Q000502:physiology; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology; D015203:Reproducibility of Results; D055815:Young Adult
keywords: Kinematic; Kinetic; Reliability; Single leg landing; Single leg squat