Trunk stability while standing or sitting: a static analysis

C. Bidard, S. Rienstra, P.H. Veltink, H.F.J.M. Koopman, J. Grady, J. de Vries, L. Huttenhuis

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    Abstract

    Several neuromuscular disorders cause trunk unstability. External support such as seating aids, orthoses, or external muscle control by FES, are then needed. In this paper, we investigate the static requirement for stabilizing the trunk in the sagittal plane while standing or sitting. A simple biomechanical model is used, composed of two moving segments, the pelvis and the upper trunk. We evaluate the stabilizing effort by the critical stiffness, the minimal linear stiffness required for making the posture stable against the gravity forces. Three basic situations are compared: standing erect, sitting erect unsupported and with a backrest. This preliminary study shows the importance of pelvis posture and motion in stabilizing the trunk. It confirms the importance of pelvis stabilization.
    Original languageEnglish
    Title of host publicationProceedings of the 5th Annual Conference of the International Functional Electrical Stimulation Society (IFESS 2000)
    Subtitle of host publicationAalborg, Denmark, 17th-21st June 200
    EditorsThomas Sinkjær, Dejan Popović, Johannes J. Struijk
    Place of PublicationAalborg, Denmark
    PublisherCenter for Sensory-Motor Interaction (SMI)
    Pages466-469
    Number of pages4
    ISBN (Print)87-90562-01-1
    Publication statusPublished - 18 Jun 2000
    Event5th Annual Conference of the International Functional Electrical Stimulation Society, IFESS 2000 - Aalborg, Denmark
    Duration: 17 Jun 200021 Jun 2000
    Conference number: 5

    Conference

    Conference5th Annual Conference of the International Functional Electrical Stimulation Society, IFESS 2000
    Abbreviated titleIFESS
    CountryDenmark
    CityAalborg
    Period17/06/0021/06/00

    Keywords

    • Biomechanics
    • Seating
    • Stability
    • Wheelchair

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