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A simple method to estimate force plate inertial components in a moving surface.

R Preuss¹, J Fung

¹School of Physical and Occupational Therapy, McGill University, Montreal, Canada.

Journal of Biomechanics

|June 24, 2004

Summary

Researchers developed a method to accurately measure forces during balance studies by removing force plate inertial components (FPIC). This technique significantly improves the precision of kinetic analyses in postural control research.

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Area of Science:

Biomechanics
Human Movement Science
Neuroscience

Background:

Support surface perturbations are crucial for studying balance and postural control.
Force plates on moving surfaces capture inertial artifacts, complicating accurate force measurement.
Accurate force data is essential for subsequent analyses like inverse dynamics.

Purpose of the Study:

To develop and validate a method for removing force plate inertial components (FPIC).
To improve the accuracy of contact force estimations during dynamic balance assessments.
To enhance the reliability of kinetic analyses in postural control research.

Main Methods:

Utilized surface kinematics and force plate inertial properties to estimate FPIC.
Applied a novel technique to subtract estimated FPIC from measured forces.

Related Experiment Videos

Tested the method on AMTI (OR6-7) force plates during controlled translations and rotations.

Main Results:

Achieved up to an 85% reduction in peak and integrated FPIC.
Demonstrated significant improvement in force estimation accuracy.
Validated the technique under various perturbation conditions (0.1m translation, 10° rotation, 150ms ramp).

Conclusions:

The developed method effectively removes force plate inertial components.
This technique is vital for accurate kinetic analysis in dynamic balance studies.
Improved force measurement enhances the understanding of postural control mechanisms.