Estimation of Whole Body Moment of Inertia Using Self-imposed Oscillations

Able-bodied segment moment of inertia (MOI) can b e determined from anthropometric tables and different models. These methods cannot be used for special populations such as obese subjects, elderly individuals, etc. The objec tives of this study are to estimate the personalized in vivo mome nt of inertia of the whole body using three-dimensional (3-D) inv erse dynamic and angular momentum approaches and compare their r esults to five other methods (Hanavan’s model, photogrammetry , two anthropometric tables, and inverse pendulum) tested in seven individuals. With respect to the modified Zatsiorsky method, the inverse dynamic approach values were within 3.7% of those along the all principal axes while the other four methods were off by 3.4%. The angular momentum method values were wi thin 2.0% of the modified Zatsiorsky method for all three axes of rotation. It appears that the proposed methods coul d be applied to estimate the personalized in vivo moment of iner tia of people with different body morphology. KeywordMoment of inertia, inverse pendulum mod el, inverse dynamic, angular momentum, photogrammetry