Methods for calibrating a motion and ground reaction force analysis system

A method of calibration of a system designed for analysis of ground reaction forces of a user's feet, wherein the system comprises a left and right footwear each with a plurality of force sensors, the method comprising:

• (a) obtaining a respective data measurement from each force sensor while the user's feet are in the left and right footwear;
• (b) comparing each data measurement to a respective calibration offset for a respective force sensor;
• (c) when the respective data measurement is higher than the respective calibration offset, returning to step (a) to obtain another respective data measurement from the respective force sensor;
• (d) when the respective data measurement is lower than or equal to the respective calibration offset, storing the respective data measurement as a respective updated calibration offset for the respective force sensor;
• (e) storing a start time of a force-calibration time window;
• and
• (f) when the respective data measurement is lower than or equal to the respective calibration offset:
• storing the respective data measurement as the respective updated calibration offset;
• resetting the start time of the force-calibration time window;
• and
• returning to step (a) to obtain another respective data measurement from each force sensor.

A system designed for analysis of ground reaction forces of a user's feet, comprising:

• a left and right insole each with a plurality of force sensors;
• one or more insole radio transceivers in electrical communication with the force sensors of each insole;
• and
• a mobile terminal comprising:
• a mobile radio transceiver in electrical communication with the one or more insole radio transceivers;
• a microprocessor electrically coupled to the mobile radio transceiver;
• and
• non-transitory memory electrically coupled to the microprocessor, the non-transitory memory storing computer-readable instructions that, when executed by the microprocessor, cause the microprocessor to:
• (a) obtain respective data measurements from each force sensor over a time period while the user's feet are in the left and right footwear;
• (b) determine a respective statistic of the respective data measurements for each force sensor over the time period, wherein the respective statistic comprises a minimum, a maximum, an average, a median, or a percentile of the respective data measurements;
• and
• (c) store the respective statistic as a respective calibration offset for a respective force sensor,
• wherein the computer-readable instructions, when executed by the microprocessor, further cause the microprocessor to:
• detect that the user has completed a ski turn, wherein the time period that the respective data measurements are obtained in step (a) includes the ski turn;
• and
• determine respective resulting force measurements within the ski turn for each sensor by subtracting the respective calibration offset from respective ski turn data measurements, the respective ski turn data measurements obtained during the ski turn.

A system designed for analysis of ground reaction forces of a user's feet, comprising:

• a left and right insole each with a plurality of force sensors;
• one or more insole radio transceivers in electrical communication with the force sensors of each insole;
• and
• a mobile terminal comprising:
• a mobile radio transceiver in electrical communication with the one or more insole radio transceivers;
• a microprocessor electrically coupled to the mobile radio transceiver;
• and
• non-transitory memory electrically coupled to the microprocessor, the non-transitory memory storing computer-readable instructions that, when executed by the microprocessor, cause the microprocessor to:
• (a) obtain a respective data measurement from each force sensor while the user's feet are in the left and right footwear;
• (b) compare each data measurement to a respective calibration offset for a respective force sensor;
• (c) when the respective data measurement is higher than the respective calibration offset, return to step (a) to obtain another respective data measurement from each force sensor;
• and
• (d) when the respective data measurement is lower than or equal to the respective calibration offset, store the respective data measurement as a respective updated calibration offset,
• wherein the computer-readable instructions, when executed by the microprocessor, further cause the microprocessor to:
• (e) store a start time of a force-calibration time window;
• and
• (f) when the respective data measurement is lower than or equal to the respective calibration offset:
• store the respective data measurement as the respective updated calibration offset;
• reset the start time of the force-calibration time window;
• and
• return to step (a) to obtain another respective data measurement from each force sensor.