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Postural responses to changing task conditions.

P D Hansen1, M H Woollacott, B Debu

  • 1Department of Physical Education and Human Movement Studies, University of Oregon, Eugene 97403.

Experimental Brain Research
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Postural adaptation responses to rotational perturbations were not affected by prior horizontal perturbations. Muscle responses showed gradual amplitude reduction over trials, suggesting multiple sensory inputs contribute to postural control.

Area of Science:

  • Human movement science
  • Neuroscience
  • Biomechanics

Background:

  • Discrepancies exist in the literature regarding postural adaptation.
  • The influence of prior perturbation types on subsequent responses is unclear.

Purpose of the Study:

  • Investigate postural adaptation to rotational perturbations.
  • Determine if horizontal perturbations alter responses to rotational ones.
  • Clarify the role of sensory inputs in postural control.

Main Methods:

  • Recorded surface electromyography (EMG) from gastrocnemius (GAS) and tibialis anterior (TA) muscles in twelve subjects.
  • Administered horizontal and rotational platform perturbations.
  • Statistically analyzed response amplitudes.

Related Experiment Videos

Main Results:

  • No significant difference in rotational perturbation responses based on preceding perturbation type.
  • Gradual reduction in GAS response amplitude over ten trials, not immediate elimination.
  • Immediate change in response amplitude when perturbation type switched, challenging sole reliance on ankle stretch/movement inputs.
  • Divergent GAS responses to platform translations versus direct rotations suggest multiple sensory inputs.

Conclusions:

  • The order of horizontal and rotational perturbations does not explain literature discrepancies.
  • Postural response reduction is gradual, potentially involving habituation and other factors.
  • Multiple sensory inputs are integrated for initial compensation to new perturbation types.