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Thanks re Angular Velocity Data

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  • Thanks re Angular Velocity Data

    Thankyou to everybody who replied to my search for normative angular
    velocity data. It appears that no-body has any such data!! Chris Kirtley
    suggests why:

    No - I have never seen any normative data on joint velocity (and I have
    looked many times!). There are some methodological problems which I suspect
    may be the reason why. To get velocity you need to run a derivative
    algorithm - usually a difference equation followed by a filter, because
    differentiation inevitably amplifies any high-frequency noise in the signalThe end result will be very dependant on what cutoff frequency you use for
    the filter - a lower cutoff will reduce the velocity recorded, while a
    higher cutoff will let through high frequency noise. Choosing the cutoff
    is a bit subjective and empirical.

    Thanks again.

    Johanna Robertson

    Physiotherapist, MSc
    Movement Analysis Lab
    Hôpital Poincaré
    Garches, France.