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

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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.

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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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Authors and Affiliations

  1. Department of Psychology, University of Cincinnati, ML 0376, Cincinnati, OH, 45221-0376, USA

    Jennifer M. Schmit, Michael A. Riley, Paula K. Shear & Kevin D. Shockley

  2. Parkinson’s Disease and Movement Disorders Center, Department of Neurology, University of Chicago, Chicago, IL, USA

    Arif Dalvi

  3. Department of Neurology, University of Cincinnati Medical Center, Cincinnati, OH, USA

    Alok Sahay

  4. Departments of Molecular and Cellular Physiology, University of Cincinnati Medical Center, Cincinnati, OH, USA

    Raymund Y. K. Pun

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  1. Jennifer M. Schmit
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  2. Michael A. Riley
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  5. Paula K. Shear
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Correspondence to Michael A. Riley.

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Schmit, J.M., Riley, M.A., Dalvi, A. et al. Deterministic center of pressure patterns characterize postural instability in Parkinson’s disease. Exp Brain Res 168, 357–367 (2006). https://doi.org/10.1007/s00221-005-0094-y

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  • DOI: https://doi.org/10.1007/s00221-005-0094-y

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