Disentangling the contribution of the paretic and non-paretic leg to balance control in stroke patients

Edwin H.F. van Asseldonk, Jaap Buurke, Bastiaan R. Bloem, Gerbert J. Renzenbrink, Anand V. Nene, Frans C.T. van der Helm, Herman van der Kooij

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

During stroke recovery, restoration of the paretic ankle and compensation in the non-paretic ankle may contribute to improved balance maintenance. We examine a new approach to disentangle these recovery mechanisms by objectively quantifying the contribution of each ankle to balance maintenance. Eight chronic hemiparetic patients were included. Balance responses were elicited by continuous random platform movements. We measured body sway and ground reaction forces below each foot to calculate corrective ankle torques in each leg. These measurements yielded the Frequency Response Function (FRF) of the stabilizing mechanisms, which expresses the amount and timing of the generated corrective torque in response to sway at the specified frequencies. The FRFs were used to calculate the relative contribution of the paretic and non-paretic ankle to the total amount of generated corrective torque to correct sway. All patients showed a clear asymmetry in the balance contribution in favor of the non-paretic ankle. Paretic balance contribution was significantly smaller than the contribution of the paretic leg to weight bearing, and did not show a clear relation with the contribution to weight bearing. In contrast, a group of healthy subjects instructed to distribute their weight asymmetrically showed a one-on-one relation between the contribution to weight bearing and to balance. We conclude that the presented approach objectively quantifies the contribution of each ankle to balance maintenance. Application of this method in longitudinal surveys of balance rehabilitation makes it possible to disentangle the different recovery mechanisms. Such insights will be critical for the development and evaluation of rehabilitation strategies.
Original languageEnglish
Title of host publicationProceedings of Measuring Behavior 2005: 5th International Conference on Methods and Techniques in Behavioral Research
Subtitle of host publicationWageningen, The Netherlands, 30 August - 2 September 2005
EditorsLucas P.J.J. Noldus, Fabrizio Grieco, Leanne W.S. Loijens, Patrick H. Zimmerman
Place of PublicationWageningen
PublisherNoldus Information Technology
Pages114-117
Number of pages4
ISBN (Print)90-74821-71-5
Publication statusPublished - 2005
Event5th International Conference on Methods and Techniques in Behavioral Research 2005 - Wageningen International Conference Centre (WICC), Wageningen, Netherlands
Duration: 30 Aug 20052 Sep 2005
Conference number: 5
http://www.noldus.com/mb2005/

Conference

Conference5th International Conference on Methods and Techniques in Behavioral Research 2005
Abbreviated titleMB 2005
CountryNetherlands
CityWageningen
Period30/08/052/09/05
Internet address

Keywords

  • Stroke
  • Motor control
  • Modeling
  • Recovery
  • System identification
  • Control of posture
  • Hemiparesis

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