000022915 001__ 22915
000022915 005__ 20220110134533.0
000022915 04107 $$aeng
000022915 046__ $$k2018-05-14
000022915 100__ $$aWodarski, P.
000022915 24500 $$aEvaluation of the changes of gait stability on the treadmill due to treadmill velocity changes by means of time-frequency analysis

000022915 24630 $$n24.$$pEngineering Mechanics 2018
000022915 260__ $$bInstitute of Theoretical and Applied Mechanics of the Cech Academy of Sciences, Prague
000022915 506__ $$arestricted
000022915 520__ $$2eng$$aThe frequency analysis enables the determination of changes of the COP trajectories during gait by means of detection of constantly repeated fragments. The time-frequency analysis was used in the conducted tests in order to assess the stability of gait on the treadmill. A group of 32 subjects participated in the tests at the age of 23(SD 1.8). The course of testing encompassed gait on the treadmill for 120 s. Initial velocity equalled V1=3.2 km/h for 60 s, then the treadmill accelerated by 25% to 4 km/h for subsequent 60 s. On the basis of the recorded distribution of pressure exerted on the ground and a software programme dedicated to treadmills, the following kinematic values were determined: cadence, stride time, stride length, step width for each examined group of participants and the COP position for the ML and AP directions. Using Matlab software programme, the researchers examined time-frequency dependencies and defined time-frequency periodograms for the ML and AP directions of the COP motions. In order to conduct a quantitative assessment of results, PSD coefficients were determined. The results indicate statistically significant changes in kinematic parameters except for the step width. The COP trajectories show the appearance of additional components indicating the change of gait stability. The changes of a method of body balancing and at the same time a way of the COP displacement during gait were confirmed by the analysis of the harmonic amplitudes. The conclusions show that the time-frequency analysis made it possible to determine changes in stability during the whole investigation on the grounds of the COP measurements. This methodology may be used to assess progress of the therapy of patients with balance instability.

000022915 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022915 653__ $$agait, time-frequency analysis, COP, diagnosis

000022915 7112_ $$aEngineering Mechanics 2018$$cSvratka, CZ$$d2018-05-14 / 2018-05-17$$gEM2018
000022915 720__ $$aWodarski, P.$$iet, al.
000022915 8560_ $$ffischerc@itam.cas.cz
000022915 8564_ $$s730975$$uhttps://invenio.itam.cas.cz/record/22915/files/929.pdf$$yOriginal version of the author's contribution in proceedings, page , section BIO.
000022915 962__ $$r21225
000022915 980__ $$aPAPER