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Sensitivity of infants with and without Down syndrome to intrinsic dynamics

B D Ulrich1, D A Ulrich, R Angulo-Kinzler

  • 1Department of Kinesiology, Indiana University, USA. ulrichb@indiana.edu

Research Quarterly for Exercise and Sport
|March 1, 1997
PubMed

Insights

Infants with Down syndrome (DS) showed less adaptation to leg weight perturbations compared to typically developing infants. This suggests potential challenges in motor skill acquisition for infants with DS.

Area of Science:

  • Developmental neuroscience
  • Motor control in infants
  • Down syndrome research

Background:

  • Infants spontaneously move their legs, exhibiting intrinsic dynamics.
  • Understanding motor adaptation is crucial for typical development.
  • Down syndrome (DS) may affect motor development and adaptation.

Purpose of the Study:

  • To investigate how infants with and without Down syndrome (DS) adapt leg movements to external perturbations.
  • To compare the intrinsic dynamics and adaptability of leg movements between infants with and without DS.

Main Methods:

  • Infants sat in a seat with weights (25%, 50%, 100% calf mass) attached to one leg.
  • Spontaneous leg movements and activity levels of both legs were recorded.
  • Adaptation was assessed by comparing movement changes in weighted vs. unweighted legs.

Main Results:

  • Both groups increased activity in the unweighted leg relative to the weighted leg, especially at higher weightings.
  • Individual differences in sensitivity thresholds were noted in both groups.
  • More infants with DS exhibited minimal overt adaptation to the added weight compared to controls.

Conclusions:

  • Infants with DS may have a reduced capacity to adapt movement dynamics to perturbations.
  • Differential response to movement context dynamics is vital for acquiring functional motor skills.
  • Findings highlight potential motor development differences in infants with Down syndrome.

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