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CoM displacement from force plate data

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  • CoM displacement from force plate data

    I am about to embark on a study looking at leg stiffness pre and post fatigue.
    To measure leg stiffness I will have participants performing various drop
    jumps and hopping tasks on a force platform. To calculate leg stiffness I
    first need to calculate the centre of mass displacement from the force
    measurements recorded during each ground contact. I know the mathematical
    procedure of double integration will give me the CoM displacement from the
    force data. However, I have been trying to construct a spreadsheet that will
    do this calculation for me so all I need to do is simply paste in force data
    and the CoM displacement will be automatically calculated. Unfortunately I
    have not been able to get my commands quite right in excel so my calculations
    are not working. Has anyone out there got a spreadsheet (or name of a
    program) that would do these calculations for me?

    I would like to calculate the CoM displacement throughout the entire ground
    contact phase so I can also check for spring like behaviour as well as
    measuring leg stiffness (which only requires the maximum CoM displacement).

    Thanks for your time,

    Jon Oliver