Article

This study investigates the possibility of using the so-called Statically
Equivalent Serial Chain approach to estimate the subject-specific 3D whole-body
centre of mass (CoM) location. This approach is based on a compact formulation of
the 3D whole-body CoM position associated with a least squares identification
process. This process requires a calibration phase that uses
stereophotogrammetric and dynamometric data collected in selected static
postures. After this calibration phase, the instantaneous position of the
identified subject-specific 3D whole-body CoM can be estimated for any motor task
using kinematic data only. This approach was experimentally validated on twelve
healthy young subjects. The Statically Equivalent Serial Chain solution was
validated during static trials with the centre of pressure, with the double
integrated ground reaction forces during dynamic tasks, and also compared with a
segmental method using a stereophotogrammetric system and anthropometric tables.
Considerations relative to the choice of algorithm parameters, such as the number
of necessary static postures and their time duration, are discussed. The proposed
method shows much smaller differences between the projection of the centre of
mass and the centre of pressure (root mean square value under 3.5%) than the
method using anthropometric tables (root mean square value over 9%). Same
conclusion can be made during dynamic tasks with a smaller difference obtained
for SESC (root mean square value under 4% at contrary the 20% obtained with
anthropometric table).
CI - Copyright (c) 2014 Elsevier B.V. All rights reserved.

Langue : ANGLAIS