title: Reliability of knee extensor and flexor muscle strength measurements in persons with late effects of polio.
abstract: OBJECTIVE
  To assess the reliability of knee extensor and flexor muscle strength measurements in persons with late effects of polio.
  
  
  METHODS
  A test-retest reliability study.
  
  
  METHODS
  Thirty men and women (mean age 63 (standard deviation 6.4) years) with verified late effects of polio.
  
  
  METHODS
  Knee extensor and flexor muscle strength in both lower limbs were measured twice 7 days apart using a Biodex dynamometer (isokinetic concentric contractions at 60 degrees /sec and isometric contractions with knee flexion angle 90 degrees) and a Leg Extension/Curl Rehab exercise machine with pneumatic resistance (HUR) (isotonic contractions). Reliability was assessed with the intraclass correlation coefficient (ICC1,1), the mean difference between the test sessions (d) together with the 95% confidence intervals for d, the standard error of measurement (SEM and SEM%), the smallest real difference (SRD and SRD%) and Bland-Altman graphs.
  
  
  RESULTS
  Test-retest agreements were high, (ICC1,1 0.93-0.99) and measurement errors generally small. The SEM% was 4-14% and the SRD% 11-39%, with the highest values for the isokinetic measurements.
  
  
  CONCLUSIONS
  Knee muscle strength can be measured reliably and can be used to detect real changes after an intervention for a group of persons with late effects of polio, whereas the values may be too high for single individuals or to detect smaller short-term changes over time for a group of individuals.
authors.affiliation: Department of Rehabilitation, Skåne University Hospital, Orupssjukhuset, Lund, Sweden. ulla-britt.flansbjer@skane.se
authors.forename: Ulla-Britt
authors.initials: UB
authors.lastname: Flansbjer
authors.forename: Jan
authors.initials: J
authors.lastname: Lexell
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D017063:Outcome Assessment, Health Care; D016262:Postpoliomyelitis Syndrome / Q000503:physiopathology* / Q000534:rehabilitation; D016059:Range of Motion, Articular / Q000502:physiology; D015203:Reproducibility of Results