Determination of subject specific whole-body centre of mass using the 3D Statically Equivalent Serial Chain

•Identification of subject specific 3D whole-body centre of mass.•Statically Equivalent Serial Chain centre of mass modelling.•Subject specific masses asymmetries. This study investigates the possibility of using the so-called Statically Equivalent Serial Chain approach to estimate the subject-speci...

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Published in:Gait & posture Vol. 41; no. 1; pp. 70 - 75
Main Authors: Bonnet, Vincent, González, Alejandro, Azevedo-Coste, Christine, Hayashibe, Mitsuhiro, Cotton, Sébastien, Fraisse, Philippe
Format: Journal Article
Language:English
Published: England Elsevier B.V 01.01.2015
Elsevier
Subjects:
3D centre of mass, Identification
Adult
Algorithms
Anthropometry
Automatic
Biomechanical Phenomena
Biomechanics
Clinical rehabilitation
Engineering Sciences
Female
Healthy Volunteers
Humans
Least-Squares Analysis
Male
Models, Biological
Motor Activity - physiology
Muscle Strength Dynamometer
Orthopedics
Photogrammetry
Posture - physiology
Pressure
Biomechanics
Clinical rehabilitation
3D centre of mass, Identification
Identification
3D centre of mass
ISSN:0966-6362, 1879-2219, 1879-2219
Online Access:Get full text
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Summary:•Identification of subject specific 3D whole-body centre of mass.•Statically Equivalent Serial Chain centre of mass modelling.•Subject specific masses asymmetries. 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).
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ISSN:0966-6362
1879-2219
1879-2219
DOI:10.1016/j.gaitpost.2014.08.017