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Summary of responses - Query on continuous walking forcemeasurements

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  • Summary of responses - Query on continuous walking forcemeasurements

    Here is a summary of responses to my original request for information.
    Many thanks to all who replied and even sent me time series. I'm told it
    is customary to post a set of the replies
    So I guess I have implicit permission to post these. Trust that's OK.

    James brownjohn

    Original post:

    I'm a civil engineering researcher studying forces induced by
    people moving on structures.

    Forces due to people on structures are normally modelled as a
    sequence of Fourier components obtained from a
    sigle footfall trace on a force plate, and this is usually for
    vertical forces only.

    I have been using a Kistler Gaitway machine to measure 1-miute
    series of walking at various speeds to
    t study variability of the various parameters i.e. to get more
    realistic data.

    I am probably not the first to do this so if anyone has studied
    this from apoint of view of the forces
    generated by the person rather than the forces on the person,
    I'd be interested to contact them.

    Also the lateral forces are rather harder to measure; a force
    plate can only capture one trace and there are
    dfficulties using a Gaitway machine for lateral measurements
    (according to Kistler and the posts I''ve read).

    There are also in-sole pressure measuring devices that people
    have used. Again, if anyone has time series data
    For lateral/vertical forces in continuous walking I'd love to
    hear from them.


    Dr Brownjohn,

    we use a tri-axial force transducer (force and moment) mounted in the
    pylon of an artificial leg. From this we can get about 20 seconds of
    continuous data. The duration is limited by the length or our cable.
    I'm guessing that your colleagues in Singapore may have similar measuing
    capability. The walking profile of many below-knee amputees is not that
    far off 'normal' people. However, keep in mind that we are not able to
    transform the forces to a global coordinate system, since we do not know
    the orientation of the leg at all times.

    Might I suggest combining an accelerometer mounted on the sacrum with
    your present measurements [not that I have tried it, or know anybody who
    has]. The shock absorbing capabilities of the body outside the saggital
    plane (forward + vertical direction) are not as great. Thus you may get
    a reasonable first order estimate of the frequency components.
    -- Santosh --

    Santosh Zachariah
    Research Assistant Professor, Dept. of Bioengineering Prosthetic
    Engineering Laboratory

    Good luck


    Dr. Brownjohn;
    I'm a podiatrist from Indiana in the U.S.. I use f-scan in shoe pressure
    analysis for gait analysis for postural problems. I analyze the force vs
    time curves, use a Timing Analysis Module for f-scan and watch the
    recordings for changes in Center of Pressure. I have a Power Point
    Presentation that explains some of what it is that I do. I'd be happy to
    share that with you if you are interested.
    What I do primarily, is to modify a temporary orthotic to take
    assymetrical function in the feet, and make the function symmetrical.
    What ends up happening is that many postural symptoms will improve or
    disappear w/ the improvement of symmetry.
    Bruce E. Williams, D.P.M.


    i'm a french Phd. We use in our lab a new treadmill ergometers (ADAL
    treadmill), wich was abble to measure ground reaction forces in three
    dimension during gait . It was exactly what you search...
    you can be interested by the site
    arnaud FAIVRE
    Laboratory of sport science
    place st jacque
    25000 besancon


    Prof. Brownjohn, Lateral forces (and anterior-posterior forces) in
    continuous walking can and have been measured. Rodger Kram and his
    graduate students built a force-measuring treadmill that can measure
    all three components of force as well as moments. He is currently at
    Colorado State Univ. in Boulder. I am attaching a PDF of the article
    on the device.


    Young-Hui Chang



    Can you please email Dr Brownjohn a
    representative dataset for >60 seconds
    continuous walking? (Include vertical,
    antero/posterior and medio/lateral forces.)

    Regards, Brian

    Dr. Brownjohn,

    Here is the continuous walking data that you have requested it was
    collected at 120Hz for 60seconds on a normal subject at a speed of 3.1
    km/hr. It has been put in excel format. If you have any questions
    please feel free to contact me.


    Jennifer Kuznicki
    Lerner Research Institute
    The Cleveland Clinic Foundation

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