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Re: whole-body vibration

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  • Re: whole-body vibration

    Dear Arno,

    In order to avoid relative displacement of marker points with respect to the
    underlying skeletal structures (due to skin movement), we use WLRT imaging
    techniques to capture the entire back surface in 3D, and active contour
    techniques to trace the skeletal structures from surface data [1]. Thanks to
    the fact that you have more information available - the entire back surface
    instead of marker points - a better estimation of vertebral rotation is

    Dr. Hierholzer (Muenster, Germany) has published some articles on this
    subject for static applications (e.g. scoliosis detection), and Diers
    International (Wiesbaden, Germany) is commercializing the technique
    (Formetric II). A European project (4D Bodyscan) has just started to extend
    the applicability of the technique to dynamic applications in general;
    furthermore several Belgian labs are currently involved in a study to
    measure whole body vibration with this technique (Vibracom,

    Please contact me if you need more information.

    Best Regards,
    Bart Haex

    [1] T. Huysmans, B. Haex, R. Van Audekercke, J. Vander Sloten, G. Van der
    Perre, R. Van Haute, J. Baeteman. 3D-postural analysis for the evaluation of
    spinal deformations during sleep. Ergonomic software tools in product and
    workplace design. A review of recent developments in human modeling and
    other design aids. Edited by K. Landau, Verlag ERGON GmbH. Stuttgart, 2000,
    ISBN 3-932160-11-8, 2000, pp 72-85.

    Dr. Bart Haex
    Div. of Biomechanics and Engineering Design
    Department of Mechanical Engineering
    Faculty of Applied Sciences
    Katholieke Universiteit Leuven
    Celestijnenlaan 200 A
    B-3001 Heverlee
    Tel: +32/16327057
    Fax: +32/16327994

    -----Original Message-----
    From: Biomechanics and Movement Science listserver
    [mailto:BIOMCH-L@NIC.SURFNET.NL]On Behalf Of Arno Grunendahl
    Sent: woensdag 22 januari 2003 16:19
    Subject: [BIOMCH-L] whole-body vibration

    Dear colleagues,

    today we measured the relative displacement of marker points, placed
    along the spine, during jumping with a VICON-system.
    The question is how can we calculate the relative displacement of single
    vertebrae from the collected data, as it contains the displacement of
    skin etc.
    The global aim is to measure whole-body vibration, i.e. accelleration
    and displacement would be relatively low.

    Maybe somebody has dealt with the same problem and will share his/her

    Thanks in advance,

    A. Grunendahl
    The king said sail, but the wind said no.

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