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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Published on: August 30, 2016

Non-linear re-calibration of force platforms.

Angelo Cappello1, Fabio Bagalà, Andrea Cedraro

  • 1Department of Electronics, Computer Science and Systems, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy.

Gait & Posture
|March 12, 2011
PubMed
Summary
This summary is machine-generated.

A new non-linear re-calibration method improves force platform (FP) accuracy in human movement analysis. This method effectively compensates for top plate bending, enhancing measurements of ground reaction force and center of pressure (COP).

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Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings
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Last Updated: Jun 3, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings
06:21

Postural Organization of Gait Initiation for Biomechanical Analysis Using Force Platform Recordings

Published on: July 26, 2022

Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Instrumentation and Measurement

Background:

  • Force platforms (FPs) are crucial for measuring ground reaction forces and center of pressure (COP) in human movement analysis.
  • FP measurements can be affected by non-linearity caused by top plate bending under load, impacting data accuracy.
  • Previous linear re-calibration methods have been used, but non-linearities may require more advanced compensation.

Purpose of the Study:

  • To propose and validate a novel global, non-linear re-calibration method for force platforms.
  • To compensate for non-linear errors induced by top plate bending in FPs.
  • To compare the performance of the non-linear method against a previous linear re-calibration solution.

Main Methods:

  • Developed a non-linear re-calibration matrix based on a previous linear method.
  • Experimentally tested the method on four commercial FPs.
  • Estimated the non-linear re-calibration matrix in a training trial and validated its performance in a separate trial.

Main Results:

  • Non-linear re-calibration significantly improved average center of pressure (COP) accuracy across four FPs, reducing errors from ~2-14 mm to ~0.5-2.3 mm.
  • In validation trials, the non-linear method reduced mean errors for force components (Fx, Fy, Fz) and COP compared to linear re-calibration.
  • The proposed global, non-linear method demonstrated performance comparable to local, linear methods for mild non-linear behaviors.

Conclusions:

  • The proposed global, non-linear re-calibration method effectively compensates for mild non-linearities in force platforms.
  • This method offers an advantage by requiring the estimation of a single re-calibration matrix.
  • The technique enhances the accuracy of kinetic and energetic quantities derived from force platform data in human movement analysis.