A linear feedback system unveils the complexity in the posturo-kinetic co-ordination. Effect of expertise on bending movements in gymnasts and non-gymnasts

Karen Roux, C. Gentil, M. Schieppati

Research output: Contribution to journalArticle

Abstract

The aim of the present study was to compare possible differences in the posturo-kinetic co-ordination between expert (gymnasts) and non-expert subjects (non-gymnasts). Fifteen males took part in the experiment. The subjects were instructed to perform ten repetitions of two types of movements, implying return from a forward leaning to a vertical posture. The co-variations between angular positions, angular velocities and torque were studied to explain the difference found between different expertise levels. As no significant difference in the variable co-variations was obtained for either group, a control mechanism was modelled by a linear feedback control system. Statistical analysis showed that i) the correlation between feedback coefficients was greater for expert than non-expert subjects, ii) four independent control parameters (each being a given combination of feedback coefficients) explained 95% of the variability in the posturo-kinetic co-ordination for both groups, iii) there was a different weight of the parameters as a function of expertise level for different groups and iv) the number of parameters always inferior for experts compared to the non-experts was sufficient to explain a given percentage of the variability. Therefore, a significant difference exists in the characteristics of the control mechanism of gymnasts and non-gymnasts, indicating that expert subjects had developed a more complex motor program through practice training. The linear model system used in this study allowed us to explain this difference.

Original languageEnglish
Pages (from-to)345-366
Number of pages22
JournalJournal of Human Movement Studies
Volume42
Issue number5
Publication statusPublished - 2002

Keywords

  • Control mechanism
  • Linear feedback system
  • Motor program
  • Posturo-kinetic co-ordination

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Experimental and Cognitive Psychology
  • Physical Therapy, Sports Therapy and Rehabilitation

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