A mathematical inertia model for segmental inertia parameter values

A mathematical inertia model developed by Fred Yeadon of Loughborough University which permits the determination of personalized segmental inertia parameter values from anthropometric measurements.

The human body is modelled using 40 geometric solids which are specified by 45 anthropometric measurements. A ‘stadium’ solid is introduced for modelling the torso segments using perimeter and width measurements. This procedure is more accurate than the use of elliptical discs of given width and depth and permits a smaller number of such solids to be used. Inertia parameter values may be obtained for body models of up to 20 segments.

Instructions for taking anthropometric measurements correctly, accurately and reliably (especially when the measurer is not trained and experienced) are documented here.

Inertia is available for download from C-Motion at $395 USD.

Inertia Features

Subject and Session Data

The Subject Database allows the user to create, load and navigate the subject database. Add and remove subjects, add and remove sessions.    Learn More...


Subject Metrics

The Subject Metrics tab allows the user to input the measurements that have been taken for a subject such as the subject’s weight (kg) and standing height (mm). There are also tabs for the input of anthropometric measurements of the Torso, Arms, Legs. On screen pictures illustrate the measurements required. Learn More...


Calculated Metrics

The Calculated Metrics tab is automatically populated when the Calc button is used. The metrics for Head and Trunk left and right side Arms and Legs and the average are all automatically calculated.

All of the calculated values can be exported for use in Visual3D or other external programs. Learn More...