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Related Experiment Videos

Do strain gauge force platforms need in situ correction?

Nachiappan Chockalingam1, Giannis Giakas, Anna Iossifidou

  • 1Sport, Health and Exercise, School of Health, Staffordshire University, Leek Road, Stoke-on-Trent ST4 2DF, UK. m.chockalingam@staffs.ac.uk

Gait & Posture
|November 22, 2002
PubMed
Summary

This study introduces a dynamic method to assess force platform accuracy by measuring the center of pressure offset. Accuracy decreases towards the platform edges, requiring a minimum vertical force for precise measurements.

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Area of Science:

  • Biomechanics
  • Instrumentation and Measurement

Background:

  • Force platform systems are crucial for biomechanical analysis.
  • Previous accuracy assessments relied on static force applications.
  • Dynamic force assessment is needed for real-world accuracy evaluation.

Purpose of the Study:

  • To present a simple, dynamic method for evaluating force platform accuracy.
  • To quantify the relationship between force application point and accuracy.
  • To determine the minimum force threshold for reliable center of pressure estimation.

Main Methods:

  • Applied a time-varying dynamic force to strain gauge-based force platforms.
  • Measured the offset of the calculated center of pressure from its geometric location.
  • Assessed accuracy variations across the platform surface.

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  • Determined the minimum vertical force required for a specified accuracy.

    • Main Results:

    • Accuracy decreases as the point of force application moves towards the platform periphery.
    • A minimum vertical force threshold of up to 113 N is necessary for accurate center of pressure estimation (S.D. of 0.3 cm).
    • The dynamic method revealed accuracy limitations not apparent with static testing.

    Conclusions:

    • The proposed dynamic method offers a practical approach to force platform accuracy verification.
    • Force platform accuracy is position-dependent, diminishing at the edges.
    • Understanding force thresholds is critical for reliable biomechanical data acquisition.