NONLINEAR ANALYSIS OF NORMAL HUMAN GAIT FOR DIFFERENT ACTIVITIES WITH APPLICATION TO BIPEDAL LOCOMOTION
Journal Title: ROMANIAN JOURNAL OF TECHNICAL SCIENCES - APPLIED MECHANICS - Year 2013, Vol 58, Issue 1
Abstract
The objective of this study is to quantify and investigate nonlinear motion of the normal human knee joint in different walking conditions using nonlinear analysis. The kinematic data of the human knee flexion-extension angles defined in the sagittal plane were analyzed for different kinematic conditions of human walking on the treadmill and on the over-ground. A time series was constructed for each test. For each time series the angular displacements diagrams are obtained.The kinematic data series were acquired with a complex electro-goniometer system. The curves strides were normalized by interpolation with cubic Spline functions, using MATLAB environment, and reported on the abscissa at an scaled interval from 0 to 100 percentage. The medium stride for each test is determined. The main spatio-temporal parameters of the performed tests and the results obtained from statistical analyse are presented. Profiles of phase planeportraits are presentedto demonstratetheutilityof theapproachin extracting information about the kinematics of steady state. For all time series, the human motion was characterized with the correlation dimension and the largest Lyapunov exponentasnonlinearmeasuresfromtheexperimentaltimeseriesoftheflexion-extension angle of human knee joint. The calculation of the LLE and correlation dimension was performed using the Chaos Data Analyser software.
Authors and Affiliations
DANIELA TARNITA, MARIUS CATANA, DAN TARNITA
Keywords
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