title: Concurrent Validity and Test-retest Reliability of the OPTOGait Photoelectric Cell System for the Assessment of Spatio-temporal Parameters of the Gait of Young Adults.
abstract: [Purpose] The purpose of this study was to investigate the concurrent validity and test-retest reliability of the recently introduced OPTOGait Photoelectric Cell System for the assessment of spatio-temporal parameters of gait. [Subjects] Twenty healthy young adults (mean age = 27.35, SD = 7.4) were asked to walk 3 times on walkway at a comfortable speed. [Methods] Concurrent validity was assessed by comparing data obtained using the OPTOGait and GAITRite systems, and reliability was assessed by comparing data from the first and third OPTOGait sessions. [Results] Concurrent validity, as identified by intra-class correlation coefficients (ICC (2, 1) = 0.929-0.998), coefficients of variation (CVME = 0.32-11.30%), and 95% limits of agreement, showed high levels of correlation. In addition, the test-retest reliability of the OPTOGait Photoelectric Cell System was demonstrated as showing a high level of correlation with all spatio-temporal parameters by intra-class correlation coefficients (ICC (3, 1) = 0.785-0.952), coefficients of variation (CVME = 1.66-4.06%), 95% limits of agreement, standard error of measurement (SEM = 2.17-5.96%), and minimum detectable change (MDC95% = 6.01-16.52%). [Conclusion] The OPTOGait Photoelectric Cell System has strong concurrent validity along with relative and absolute test-retest reliabilities. This portable system with easy-to-use features can be used for clinical assessments or research purposes as an objective means of assessing gait.
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Republic of Korea.
authors.forename: Myung Mo
authors.initials: MM
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Republic of Korea.
authors.forename: Chang Ho
authors.initials: CH
authors.lastname: Song
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Republic of Korea.
authors.forename: Kyoung Jin
authors.initials: KJ
authors.lastname: Lee
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Republic of Korea.
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Jung
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Republic of Korea.
authors.forename: Doo Chul
authors.initials: DC
authors.lastname: Shin
authors.affiliation: Department of Physical Therapy, College of Health Science, Sahmyook University, Republic of Korea.
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Shin
keywords: Analysis; Locomotion; Measurement