A template for the exploration of chaotic locomotive patterns

Max J Kurz, Nicholas Stergiou, Jack Heidel, E. Terry Foster

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Inverted pendulum and spring-mass models have been successfully used to explore the dynamics of the lower extremity for animal and human locomotion. These models have been classified as templates that describe the biomechanics of locomotion. A template is a simple model with all the joint complexities, muscles and neurons of the locomotor system removed. Such templates relate well to the observed locomotive patterns and provide reference points for the development of more elaborate dynamical systems. In this investigation, we explored if a passive dynamic double pendulum walking model, that walks down a slightly sloped surface (γ<0.0189 rad), can be used as a template for exploring chaotic locomotion. Simulations of the model indicated that as γ was increased, a cascade of bifurcations were present in the model's locomotive pattern that lead to a chaotic attractor. Positive Lyapunov exponents were present from 0.01839 rad <γ<0.0189 rad (Lyapunov exponent range=+0.002 to +0.158). Hurst exponents for the respective γ confirmed the presence of chaos in the model's locomotive pattern. These results provide evidence that a passive dynamic double pendulum walking model can be used as a template for exploring the biomechanical control parameters responsible for chaos in human locomotion.

Original languageEnglish (US)
Pages (from-to)485-493
Number of pages9
JournalChaos, Solitons and Fractals
Volume23
Issue number2
DOIs
StatePublished - Jan 1 2005

Fingerprint

locomotives
Template
templates
locomotion
Locomotion
pendulums
walking
exponents
Pendulum
Model
Lyapunov Exponent
chaos
Chaos
biodynamics
Biomechanics
Hurst Exponent
Inverted Pendulum
Reference Point
Chaotic Attractor
muscles

Keywords

  • Chaos
  • Fractals
  • Gait
  • Locomotion
  • Template
  • Variability

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematics(all)
  • Physics and Astronomy(all)
  • Applied Mathematics

Cite this

A template for the exploration of chaotic locomotive patterns. / Kurz, Max J; Stergiou, Nicholas; Heidel, Jack; Foster, E. Terry.

In: Chaos, Solitons and Fractals, Vol. 23, No. 2, 01.01.2005, p. 485-493.

Research output: Contribution to journalArticle

Kurz, Max J ; Stergiou, Nicholas ; Heidel, Jack ; Foster, E. Terry. / A template for the exploration of chaotic locomotive patterns. In: Chaos, Solitons and Fractals. 2005 ; Vol. 23, No. 2. pp. 485-493.
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