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HOw Is Contact and Oscillation measured

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  • HOw Is Contact and Oscillation measured

    I am just curious exactly how the machine measures these things? It can't be through the watch as that has way too much movement, it has to be through the chest strap, is that correct? Anybody have any technical knowledge about what is going on during that measurement?

  • #2
    Vertical oscillation/ground contact time/stride length are measured through the module on the chest strap or, in the case of newer watches, through the Running Dynamics Pod you clip onto the back of your running shorts.

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    • #3
      yes it through reading in the accelerometer in the HRM and some clever maths.

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      • #4
        The accelerometer for the vertical axis can measure both how fast and for how long it's seeing movement in that direction. So Distance = Time X Speed going upward gives the Vertical Oscillation. Sensing when the downward travel stops and upward travel resumes gives you Ground Contact Time. being able to sense lateral acceleration as well is how it tells left from right to give Ground Contact Time Balance.

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