Component Inertia Modeling of Segmental Wobbling and Rigid Masses

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Marianne J.R. Gittoes University of Wales Institute, Cardiff

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David G. Kerwin University of Wales Institute, Cardiff

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A modification to an existing mathematical model is described, which permits the determination of subject-specific inertia parameters for wobbling and rigid masses of female body segments. The model comprises segment-specific soft tissue, bone, and lung components. A total of 59 geometric solids (40 soft tissue, 17 bone, 2 lung) were used to represent the body components. Ninety-five anthropometric measurements were collected from 7 female participants and were used to develop and evaluate the model. The success of the model is evaluated using predicted mass and mass distribution. The overall absolute accuracy in predicted whole body mass was better than 3.0%, with a maximum error of 4.9%. The appropriateness of the cadaver-based density values used in the model is addressed and the accuracy of the component inertia model in relation to uniform density models is discussed. The model offers a novel approach for determining component inertia parameters, which have been used successfully in a wobbling mass model to produce realistic kinetic analyses of drop-landings.

The authors are with the Cardiff School of Sport, University of Wales Institute, Cardiff, Cyncoed Campus, Cyncoed Road, Cardiff CF23 6XD, U.K.

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