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This study develops a feature to quantify the degree of validity of the IP model for quiet standing human body. By denoting the anterior–posterior component of the ground reaction force (GRF) as GRFx and defining COP error as the difference between the displacements of the center of pressure (COP) and the vertical projection of center of mass (COM), the proposed feature is chosen as the correlation coefficient between GRF x and COP error signals. The rationale behind such a design is the property of the IP model which states that GRF x is proportional to COP error. The efficacy of the proposed feature is demonstrated by comparing its differences between two age groups in quiet standing. The experimental results show that the IP model can more accurately predict the correlation strength between COP error and GRFx of the older group than the younger group. This seems to suggest that the older group behaves more like an IP than the younger group.

Assessing the Validity of the Quiet Standing Inverted Pendulum Model