Anterior-posterior and medial-lateral control of sway in infants during sitting acquisition does not become adult-like

Fabien Cignetti, Anastasia Kyvelidou, Regina T. Harbourne, Nicholas Stergiou

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We examined (1) how sitting postural control in infants develops in the anterior-posterior (A/P) and medial-lateral (M/L) directions of sway, and (2) whether this control is already adult-like during the late phase of infant's sitting acquisition. COP data were acquired from 14 healthy infants (from the onset of sitting until independent sitting) and 21 healthy adults while sitting on a force platform. Attractor dimensionality (CoD: correlation dimension), attractor predictability (LyE: largest Lyapunov exponent), and sway variability (RMS: root-mean square) were calculated from the COP data to evaluate postural control. In the A/P direction, sitting was mastered by the infants by decreasing the active degrees of freedom of the postural system (decreased CoD), using a more predictable and (locally) stable sway (decreased LyE), and increasing sway variability (increased RMS). Control of sitting became practically simple, stable and exploratory with infant development. This may support the hypothesis that the sitting posture serves as the foundation for the development of other motor skills, as reaching. In the M/L direction, only sway variability decreased with development, possibly due to changes in the infant's body dimensions. Taken together, these findings indicate that early in development the focus is more in the A/P than the M/L direction. Adults' postural control was found more adaptable than the infants in both directions, involving more active degrees of freedom and less predictable sway patterns. Identifying the factors that make the dynamics of the postural system adult-like requires further research.

Original languageEnglish (US)
Pages (from-to)88-92
Number of pages5
JournalGait and Posture
Volume33
Issue number1
DOIs
StatePublished - Jan 1 2011

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Motor Skills
Child Development
Posture
Direction compound
Research

Keywords

  • Attractor dynamics
  • Degrees of freedom
  • Local stability
  • Motor development
  • Posture

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Rehabilitation
  • Biophysics

Cite this

Anterior-posterior and medial-lateral control of sway in infants during sitting acquisition does not become adult-like. / Cignetti, Fabien; Kyvelidou, Anastasia; Harbourne, Regina T.; Stergiou, Nicholas.

In: Gait and Posture, Vol. 33, No. 1, 01.01.2011, p. 88-92.

Research output: Contribution to journalArticle

Cignetti, Fabien ; Kyvelidou, Anastasia ; Harbourne, Regina T. ; Stergiou, Nicholas. / Anterior-posterior and medial-lateral control of sway in infants during sitting acquisition does not become adult-like. In: Gait and Posture. 2011 ; Vol. 33, No. 1. pp. 88-92.
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