A Dynamical Analysis of Changing Direction During Walking
Xu, Dali
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https://hdl.handle.net/2142/86411
Description
Title
A Dynamical Analysis of Changing Direction During Walking
Author(s)
Xu, Dali
Issue Date
1997
Doctoral Committee Chair(s)
Karl Rosengren
Department of Study
Kinesiology and Community Health
Discipline
Kinesiology and Community Health
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biophysics, General
Language
eng
Abstract
A dynamic analysis of the three dimensional (3-D) kinematic and kinetic characteristics of changing direction during walking was conducted which included examination of: the body segment contributions to the angular momentum about the center of mass of the whole body, coordination and control of interlimb and intralimb at the lower extremities, forces and moments of force at the lower extremities, and preparation for changing direction during walking at the prior step. Eight young healthy adult subjects participated in this study. Two Peak High Speed Camera Systems and two AMTI force platforms were employed for recording 3-D kinetics and kinematics. Changing direction with different turn angles, pivot feet, and walking speeds was examined. The results show that (1) altering angle and pivot foot produced large changes in the angular momentum, forces and moments; (2) there were significant differences for the moments and impulses during the stance phase of the prior step for changing direction; (3) walking speed not only affected the magnitudes of the dependent variables, but also caused earlier preparation for changing direction; (4) the intralimb coordinative relationship was less stable while changing direction, but the interlimb coordinative relationship was more stable; (5) there is more risk for slips and falls while changing direction during walking than while walking straight forward, especially when the heel of the pivot foot is in contact with the ground. These findings provide a better understanding of the unique characteristics of changing direction during walking, and also provide information to help the diagnosis of persons with movement disorders.
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