title: Agreement between the spatio-temporal gait parameters from treadmill-based photoelectric cell and the instrumented treadmill system in healthy young adults and stroke patients.
abstract: BACKGROUND
  Treadmill gait analysis was more advantageous than over-ground walking because it allowed continuous measurements of the gait parameters. The purpose of this study was to investigate the concurrent validity and the test-retest reliability of the OPTOGait photoelectric cell system against the treadmill-based gait analysis system by assessing spatio-temporal gait parameters.
  
  
  METHODS
  Twenty-six stroke patients and 18 healthy adults were asked to walk on the treadmill at their preferred speed. The concurrent validity was assessed by comparing data obtained from the 2 systems, and the test-retest reliability was determined by comparing data obtained from the 1st and the 2nd session of the OPTOGait system.
  
  
  RESULTS
  The concurrent validity, identified by the intra-class correlation coefficients (ICC [2, 1]), coefficients of variation (CVME), and 95% limits of agreement (LOA) for the spatial-temporal gait parameters, were excellent but the temporal parameters expressed as a percentage of the gait cycle were poor. The test-retest reliability of the OPTOGait System, identified by ICC (3, 1), CVME, 95% LOA, standard error of measurement (SEM), and minimum detectable change (MDC95%) for the spatio-temporal gait parameters, was high.
  
  
  CONCLUSIONS
  These findings indicated that the treadmill-based OPTOGait System had strong concurrent validity and test-retest reliability. This portable system could be useful for clinical assessments.
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Seoul, Korea.
authors.forename: Myungmo
authors.initials: M
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Seoul, Korea.
authors.forename: Changho
authors.initials: C
authors.lastname: Song
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Seoul, Korea.
authors.forename: Kyoungjin
authors.initials: K
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Seoul, Korea.
authors.forename: Doochul
authors.initials: D
authors.lastname: Shin
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Seoul, Korea.
authors.forename: Seungho
authors.initials: S
authors.lastname: Shin
mesh_terms: D000328:Adult; D000368:Aged; D011211:Electric Power Supplies; D005080:Exercise Test / Q000295:instrumentation*; D005260:Female; D005684:Gait; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D020521:Stroke / Q000503:physiopathology*; D013997:Time Factors; D055815:Young Adult