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Upper-extremity disability in essential tremor.

Martin E Héroux1, Sarah L Parisi, Juliana Larocerie-Salgado

  • 1School of Rehabilitation Therapy, Queen's University, Kingston, ON, Canada.

Archives of Physical Medicine and Rehabilitation
|April 26, 2006
PubMed
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Essential tremor (ET) significantly impairs upper-extremity function, even when tremor is not dominant. Disability is measurable, but tremor severity doesn't always correlate with functional loss.

Area of Science:

  • Neurology
  • Movement Disorders
  • Rehabilitation Science

Background:

  • Essential tremor (ET) is a common neurological disorder characterized by involuntary shaking.
  • The impact of ET on daily functional activities, particularly upper-extremity tasks, requires standardized assessment.

Purpose of the Study:

  • To quantify the extent of disability in individuals with essential tremor using standardized, time-based measures of upper-extremity function.
  • To compare the functional performance of ET subjects with healthy controls.

Main Methods:

  • A descriptive case series design was employed.
  • Thirty subjects with ET and 28 healthy controls were assessed in a motor performance research laboratory.
  • Upper-extremity function was evaluated using the Box and Block Test, Purdue Pegboard Test (PPT), and Test Evaluant la performance des Membres supérieurs des Personnes Agées (TEMPA). Tremor severity was measured using laser displacement sensors.

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Main Results:

  • Subjects with ET demonstrated significantly poorer performance compared to controls on most unilateral and bilateral upper-extremity tasks.
  • ET subjects without dominant hand tremor still showed significant deficits on specific functional measures.
  • Functional performance showed a moderate correlation with tremor severity, particularly for the non-dominant hand.

Conclusions:

  • Individuals with essential tremor exhibit measurable functional disability in upper-extremity tasks.
  • Tremor severity does not consistently correlate with the degree of functional disability, especially concerning the dominant upper extremity.