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Bimanual Force Variability and Chronic Stroke: Asymmetrical Hand Control

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  • Nyeonju Kang
  • James H Cauraugh

Abstract

The purpose of this study was to investigate force variability generated by both the paretic and non-paretic hands during bimanual force control. Nine chronic stroke individuals and nine age-matched individuals with no stroke history performed a force control task with both hands simultaneously. The task involved extending the wrist and fingers at 5%, 25%, and 50% of maximum voluntary contraction. Bimanual and unimanual force variability during bimanual force control was determined by calculating the coefficient of variation. Analyses revealed two main findings: (a) greater bimanual force variability in the stroke group than the control group and (b) increased force variability by the paretic hands during bimanual force control in comparison to the non-paretic hands at the 5% and 25% force production conditions. A primary conclusion is that post stroke bimanual force variability is asymmetrical between hands.

Suggested Citation

  • Nyeonju Kang & James H Cauraugh, 2014. "Bimanual Force Variability and Chronic Stroke: Asymmetrical Hand Control," PLOS ONE, Public Library of Science, vol. 9(7), pages 1-6, July.
    • Handle: RePEc:plo:pone00:0101817
    DOI: 10.1371/journal.pone.0101817
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    References listed on IDEAS

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    1. Neha Lodha & Gaurav Misra & Stephen A Coombes & Evangelos A Christou & James H Cauraugh, 2013. "Increased Force Variability in Chronic Stroke: Contributions of Force Modulation below 1 Hz," PLOS ONE, Public Library of Science, vol. 8(12), pages 1-9, December.
    2. Christopher M. Harris & Daniel M. Wolpert, 1998. "Signal-dependent noise determines motor planning," Nature, Nature, vol. 394(6695), pages 780-784, August.
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