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push off phase for vertical jump

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  • push off phase for vertical jump

    Hello everyone,

    I'm a new subscriber to this group and have a question. The company
    I work with is developing an accelerometry based motion analysis
    product designed specifically for power based sports.

    My question: During a vertical jump should the beginning of the
    push-off phase of the jump be where acceleration is zero (before
    the actual displacement begins) or where velocity becomes positive
    (displacement becomes apparent)?

    Force plate software seems to base their calculations on the
    acceleration (force) at the zero mark. Is there any dispute over
    this? Thank you for all the information you can provide me.

    Best regards,

    Randy Mason,
    Motion Analysis Researcher,
    6th Dimension Devices
    o 250.384.9159