A limit-cycle model of leg movements in cross-country skiing and its adjustments with fatigue

F. Cignetti, F. Schena, D. Mottet, A. Rouard

Research output: Contribution to journalArticlepeer-review

Abstract

Using dynamical modeling tools, the aim of the study was to establish a minimal model reproducing leg movements in cross-country skiing, and to evaluate the eventual adjustments of this model with fatigue. The participants (N=8) skied on a treadmill at 90% of their maximal oxygen consumption, up to exhaustion, using the diagonal stride technique. Qualitative analysis of leg kinematics portrayed in phase planes, Hooke planes, and velocity profiles suggested the inclusion in the model of a linear stiffness and an asymmetric van der Pol-type nonlinear damping. Quantitative analysis revealed that this model reproduced the observed kinematics patterns of the leg with adequacy, accounting for 87% of the variance. A rising influence of the stiffness term and a dropping influence of the damping terms were also evidenced with fatigue. The meaning of these changes was discussed in the framework of motor control.

Original languageEnglish
Pages (from-to)590-604
Number of pages15
JournalHuman Movement Science
Volume29
Issue number4
DOIs
Publication statusPublished - Aug 2010

Keywords

  • Cross-country skiing
  • Damping
  • Dynamical model
  • Fatigue
  • Stiffness

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Biophysics
  • Experimental and Cognitive Psychology

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