Local dynamic stability in turning and straight-line gait

Abstract Successful community and household ambulation require the ability to navigate corners and maneuver around obstacles, posing unique challenges compared to straight-line walking. The challenges associated with turning may contribute to an increased incidence of falling and the occurrence of f...

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Bibliographic Details
Published in:Journal of biomechanics 2008-01, Vol.41 (7), p.1486-1493
Main Authors: Segal, Ava D, Orendurff, Michael S, Czerniecki, Joseph M, Shofer, Jane B, Klute, Glenn K
Format: Article
Language:English
Subjects:
Accidental Falls - prevention & control
Adjustment
Adult
Aged
Biomechanical Phenomena
Exponent
Fitness equipment
Gait - physiology
Humans
Lower Extremity - physiology
Lyapunov
Male
Measurement techniques
Middle Aged
Physical Medicine and Rehabilitation
Postural Balance - physiology
Stability
Studies
Turning
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Summary:Abstract Successful community and household ambulation require the ability to navigate corners and maneuver around obstacles, posing unique challenges compared to straight-line walking. The challenges associated with turning may contribute to an increased incidence of falling and the occurrence of fall-related injuries. A measure of stability applied to turning gait may be able to quantify a system's response to naturally occurring disturbances associated with turning and identify subjects at greater risk of falling. An index of stability has been used previously to assess the rate of kinematic separation (local dynamic stability) during straight-line gait. The purpose of this study was to determine if local dynamic stability during constant speed turning is reduced compared to straight-line treadmill walking. Maximum finite-time Lyapunov exponents ( λ ) were used to estimate the local stability of able-bodied subjects’ ( n =19) sagittal plane hip, knee, and ankle trajectories for turning compared to straight-line walking at two different walking speeds. Turning λ was greater than straight λ for the hip, right knee, and ankle ( p
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2008.02.012