Abstract
The extent to which small errors from simplified methods of measurements can be tolerated may be useful for clinical studies where time and logistical considerations often override the need to be very precise. We demonstrate here two kinematic methods to approximate the vertical trajectory of the body center of mass (CoM) during walking: the mid-shoulder and navel regions compared to a full-body CoM model. The navel marker achieved a near-perfect correlation with the CoM model for displacement and velocity. In the acceleration data, deviations from the CoM model for both the navel and mid-shoulder markers were observed around the points of inflection. The estimation of CoM displacement and velocity using the navel marker appears to be adequate for clinical use in comparing between subjects, while CoM acceleration may be more suited for studying the relative change between conditions in the same subject.
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