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Agreement Between the Spatio-Temporal Gait Parameters From Treadmill-Based Photoelectric Cell and the Instrumented Treadmill System in Healthy Young Adults and Stroke Patients

Myungmo Lee, Changho Song, Kyoungjin Lee, Doochul Shin, Seungho Shin

Department of Physical Therapy, College of Health Science, Sahmyook University, Seoul, South Korea

Med Sci Monit 2014; 20:1210-1219

DOI: 10.12659/MSM.890658

Available online:

Published: 2014-07-14

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.
Material and 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.

Keywords: Adult, Electric Power Supplies, Exercise Test - instrumentation, Gait, Reproducibility of Results, Stroke - physiopathology, Time Factors, young adult