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Experimental Brain Research

, Volume 168, Issue 3, pp 357–367 | Cite as

Deterministic center of pressure patterns characterize postural instability in Parkinson’s disease

  • Jennifer M. Schmit
  • Michael A. RileyEmail author
  • Arif Dalvi
  • Alok Sahay
  • Paula K. Shear
  • Kevin D. Shockley
  • Raymund Y. K. Pun
Research Article

Abstract

Static posturographic recordings were obtained from six Parkinson’s patients and six age-matched, healthy control participants. The availability of vision and visuo-spatial cognitive load were manipulated. Postural sway patterns were analyzed using recurrence quantification analysis (RQA), which revealed differences in center of pressure (COP) dynamics between Parkinson’s and control participants. AP COP trajectories for the Parkinson’s group were not only significantly more variable than for the control group, but also exhibited distinct patterns of temporal dynamics. The visual manipulation did not differentially affect the two groups. No cognitive load effects were found. The results are generally consistent with the hypothesis that pathological physiological systems exhibit a tendency for less flexible, more deterministic dynamic patterns.

Keywords

Parkinson’s disease Postural control Balance Posturography Recurrence quantification analysis 

Notes

Acknowledgments

The research reported in this paper was part of a master’s thesis by J.M. Schmit. Preparation of this manuscript was supported in part by the United States Army Medical Research Acquisition Activity (award #W81XWH-04-1-0306).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Jennifer M. Schmit
    • 1
  • Michael A. Riley
    • 1
    Email author
  • Arif Dalvi
    • 2
  • Alok Sahay
    • 3
  • Paula K. Shear
    • 1
  • Kevin D. Shockley
    • 1
  • Raymund Y. K. Pun
    • 4
  1. 1.Department of PsychologyUniversity of CincinnatiCincinnatiUSA
  2. 2.Parkinson’s Disease and Movement Disorders Center, Department of NeurologyUniversity of ChicagoChicagoUSA
  3. 3.Department of NeurologyUniversity of Cincinnati Medical CenterCincinnatiUSA
  4. 4.Departments of Molecular and Cellular PhysiologyUniversity of Cincinnati Medical CenterCincinnatiUSA

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