Rate of force production and relaxation is impaired in patients with focal hand dystonia

Janey Prodoehl*, Colum D. MacKinnon, Cynthia L. Comella, Daniel M. Corcos

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

One factor, which may contribute to slowed movement in dystonia, is impairment in controlling the voluntary rate of motor output. This study examined the ability of patients with focal hand dystonia to rapidly turn force on and off at the wrist and elbow joints. Dystonic patients were slower than controls in rapidly turning on force from rest at both joints, passively relaxing force and rapidly reversing force output from a steady-state flexion contraction. Adding a preload did not improve the ability of dystonic subjects to rapidly turn on force. These results support the idea that dystonia is a disorder of impaired motor cortical activation, possibly due to basal ganglia dysfunction.

Original languageEnglish (US)
Pages (from-to)363-371
Number of pages9
JournalParkinsonism and Related Disorders
Volume12
Issue number6
DOIs
StatePublished - Sep 1 2006

Keywords

  • Basal ganglia
  • Isometric
  • Motor control
  • Writer's cramp

ASJC Scopus subject areas

  • Neurology
  • Geriatrics and Gerontology
  • Clinical Neurology

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