Abnormal force patterns for multidirectional postural responses in patients with Parkinson's disease

Diana Dimitrova, John Nutt, Fay B. Horak

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

This study tests the hypothesis that the basal ganglia are involved in optimizing postural responses for changes in perturbation direction and stance width. We compared the patterns of horizontal and vertical ground reactive forces under each leg in response to eight directions of surface translation in Parkinson's disease (PD) subjects and age-matched control subjects standing with both narrow and wide stance. Although passive reactive forces were larger, active forces were weaker and in abnormal directions for subjects with PD. Unlike the control subjects, who corrected their postural equilibrium in response to lateral and diagonal-lateral perturbations primarily with their loaded limbs, the PD subjects used both legs more symmetrically to recover equilibrium. PD subjects also did not change the magnitude or direction of reactive forces when initial stance width changed. These results support the hypothesis that the basal ganglia are important for optimizing automatic postural response patterns for changes in perturbation direction and for initial stance conditions.

Original languageEnglish (US)
Pages (from-to)183-195
Number of pages13
JournalExperimental Brain Research
Volume156
Issue number2
DOIs
StatePublished - May 1 2004

Keywords

  • Balance
  • Forces
  • Parkinson's disease
  • Posture

ASJC Scopus subject areas

  • Neuroscience(all)

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