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Postural instability in patients with chronic stroke.

Sinikka H Peurala1, Paavo Könönen, Kauko Pitkänen

  • 1Brain Research and Rehabilitation Center Neuron, Kuopio, Finland. sinikka.peurala@sport.jyu.fi

Restorative Neurology and Neuroscience
|August 30, 2007
PubMed
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Stroke patients with left hemiparesis exhibit greater postural sway than those with right hemiparesis. Both patient groups demonstrate significantly more sway than healthy individuals, indicating hemisphere-specific impacts on balance.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Rehabilitation Medicine

Background:

  • Stroke-induced hemiparesis affects visuospatial orientation and recovery.
  • Balance deficits vary between patients with right or left hemisphere lesions.

Purpose of the Study:

  • To assess center of pressure (COP) displacement in ambulatory stroke patients with left or right hemiparesis.
  • To compare static balance between chronic stroke patients with right versus left hemiparesis.

Main Methods:

  • Static balance was measured using a force plate in 45 stroke patients and 30 healthy controls.
  • Center of pressure (COP) displacement was analyzed for velocity, speed, and power spectral density.

Main Results:

  • Stroke patients exhibited significantly greater COP displacement (velocity, speed) than healthy subjects.

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  • Left hemiparetic patients (right hemisphere lesion) showed higher power peaks in COP displacement (ML and AP) at low frequencies compared to right hemiparetic patients.
  • Increased weight bearing on the paretic side correlated with reduced COP displacement.

    • Conclusions:

    • Left hemiparesis is associated with increased low-frequency sway (medial-lateral and anterior-posterior) compared to right hemiparesis.
    • Both right and left hemiparetic patients exhibit greater postural sway than healthy individuals.
    • Hemisphere-specific cerebral network disruptions likely underlie distinct postural deficits in hemiparetic patients.