simtk.org

Hello,

I was wondering whether AddBiomechanics takes into account limb center of mass position in the subject model during subject scaling. I have noticed that in limb local coordinates, the position coordinates of the COM do not change between the unscaled model and the scaled model. For example, the shank COM coordinates are (0,-0.1867,0) with respect to the shank origin at the knee joint, and this is true in both the scaled and unscaled models. Is limb COM taken into account, and if so how does the specified COM and limb inertia affect the inverse dynamics?

Thank you,
Duncan Lee

Hi Duncan,

We tried including limb center-of-mass optimization in AddBiomechanics, but found that the benefit was neglible relative to the added complexity in the dynamics fitting optimization.

-Nick