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Power measurement method and apparatus

  • US 9,730,617 B2
  • Filed: 09/17/2009
  • Issued: 08/15/2017
  • Est. Priority Date: 09/23/2008
  • Status: Active Grant
First Claim
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1. An apparatus for estimating power used by a user in performing a vertical component of a movement, the apparatus comprising:

  • an accelerometer configured for attachment to a user and configured for measuring components of the acceleration along three orthogonal axes experienced by the user;

    a processor configured to;

    receive the measured components of the acceleration Ax, Ay, and Az, along three orthogonal axes xa, ya, and za from the accelerometer,estimate an orientation of the accelerometer by calculating an angle θ

    between the acceleration and an axis that has the component with the highest magnitude of acceleration by;

    calculating the magnitude of each of the components of the acceleration from the measurements indicating the components of the acceleration Ax, Ay, and Az along the three orthogonal axes xa, ya, and za of the accelerometer,identifying the acceleration component with the highest magnitude,determining the angle θ

    between the acceleration and the axis with the highest component of acceleration from

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