title: Test-retest reliability of isokinetic knee extension and flexion.
abstract: OBJECTIVE
  To assess reliability of isokinetic peak torque and work for knee flexion and extension.
  
  
  METHODS
  Single-group test-retest.
  
  
  METHODS
  University laboratory.
  
  
  METHODS
  Eleven men and 7 women (mean age, 21 y).
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  Peak torque and work for concentric and eccentric knee extension and flexion were recorded at 60 degrees/s for 3 trials on 2 occasions. Intraclass correlation coefficient model 3,1 (ICC(3,1)), standard error (SE) of measurements, and smallest real differences were calculated for the maximum and for the mean peak torque and work of the 3 repetitions.
  
  
  RESULTS
  Relative reliability was "very high" for peak torque and work (ICC range, >.90). The SE measurements ranged between 5% and 10% of the initial values for both peak torque and work. The smallest change that indicates a real improvement for a single subject (smallest real differences) ranged from 12% to 25% for peak torque and work variables and from 25% to 30% for the peak torque ratios.
  
  
  CONCLUSIONS
  Isokinetic concentric and eccentric knee extensor and flexor strength variables are reliable when measured by the same examiner in asymptomatic subjects.
authors.affiliation: Centre of Physiotherapy Research at the School of Physiotherapy, University of Otago, Dunedin, New Zealand. gisela.sole@otago.ac.nz
authors.forename: Gisela
authors.initials: G
authors.lastname: Sole
authors.forename: Jonas
authors.initials: J
authors.lastname: Hamrén
authors.forename: Stephan
authors.initials: S
authors.lastname: Milosavljevic
authors.forename: Helen
authors.initials: H
authors.lastname: Nicholson
authors.forename: S John
authors.initials: SJ
authors.lastname: Sullivan
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005080:Exercise Test; D005260:Female; D006801:Humans; D007719:Knee Joint; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D018482:Muscle, Skeletal; D015203:Reproducibility of Results; D019415:Torque