Inertia Documentation

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The Inertia program has two major sections. On the left of the screen is the Subject Database section which allows the user to load and navigate a subject database. On the right of the screen are a set of three tabs which allow the user to input subject information, subject metrics and retrieve calculated metrics.




File Path

The file path at the top shows the location of the subject database that has been loaded. If the file path is empty then there is no subject database loaded. A database can be loaded by clicking New/Load... under the Database menu.

Subject Table

The Subject Table lists all of the subjects in the database that has been loaded. It also includes a summery of the information entered in the Subject Information tab. This table is used to add, remove and navigate subjects.

Database Selection


The New/Load... button allows the user to select the subject database that they wish to use. Using the New/Load... button will load the subject database into the Subject Table and will populate the file path at the top of the screen. The New/Load... button also allows the user to create a new blank database which can be saved in the location of their choice.



The Add Subject button allows the user to add another subject to the Subject Database. All of the information fields will be empty and the user can manually enter the data.



The Remove Subject button allows the user to remove a subject from the database. This will permanently delete the subject as well as any information that had been entered or calculated.

Subject Information


The Subject Information tab allows the user to manually enter specifics on the subject. Field available include:

  • First Name
  • Last Name
  • Date of Birth
  • Gender
  • Address
  • City
  • Country
  • Phone Home
  • Phone Mobile
  • Email

Subject Metrics


The Subject Metrics tab allows the user to input the measurements that they have taken of a subject. At the top of the tab are fields for the subject's weight (kg) and standing height (mm). There are four subtabs (Torso, Arms, Legs and Help) the first three are for the input of anthropometric measurements and the fourth contains explanations of how to correctly collect the anthropometric measurements. On the left of the first three tabs are the fields for entering the collected data. On the right are pictures illustrating the measurements that are being used.


The data entry fields for the Torso are:

Torso Length

  • Acromion to Hip Center (mm)
  • Acromion to Apex of Head (mm)

Torso Perimeter

  • Hip Perimeter (mm)
  • Umbilicus Perimeter (mm)
  • Lower Ribcage Perimeter (mm)
  • Chest Perimeter (mm)
  • Neck Perimeter (mm)
  • Head Perimeter (mm)

Torso Widths

  • Hip Width (mm)
  • Umbilicus Width (mm)
  • Lower Ribcage Width (mm)
  • Chest Width (mm)
  • Shoulder Center Width (mm)


The data entry fields for the Arms are separate for the left and right arm. Fields are as follows:

Arm Lengths

  • Shoulder to Wrist Center (mm)
  • Wrist to Finger End (mm)

Arm Perimeters

  • Upper Arm Perimeter (mm)
  • Elbow Perimeter (mm)
  • Max Forearm Perimeter (mm)
  • Wrist Perimeter (mm)
  • Knuckle Perimeter (mm)


The data entry fields for the Legs are separate for the left and right leg. Fields are as follows:

Leg Lengths

  • Hip to Ankle Center (mm)
  • Ankle Center to Toe End (mm)

Leg Perimeters

  • Crotch Perimeter (mm)
  • Mid Thigh Perimeter (mm)
  • Knee Perimeter (mm)
  • Max Calf Perimeter (mm)
  • Min Ankle Perimeter (mm)

Foot Perimeters

  • Heel Perimeter (mm)
  • Ball of Foot Perimeter (mm)

Calculated Metrics


The Calculated Metrics tab is automatically populated when the Calc button at the bottom is used. The metrics for Head and Trunk are on one subtab. Metrics for Arms and Legs are divided onto the Left Side, Right Side and Average tabs.

Segments which are found on the Head and Trunk Metrics tab are:

  • Head Metrics
  • Trunk Metrics

Segments which are found on the Left Side, Right Side and Average tabs are:

  • Upper Arm Metrics
  • Forearm Metrics
  • Hand Metrics
  • Thigh Metrics
  • Calf Metrics
  • Foot Metrics
  • Rearfoot Metrics
  • Forefoot Metrics

For each body segment there are six values calculated. They are:

  • Frontal Moment of Inertia
  • Lateral Moment of Inertia
  • Longitudinal Moment of Inertia
  • Segment Mass
  • Distance Proximal Joint to Mass Centre
  • Segment Length

Control Buttons

The control buttons are located at the top of the calculated metrics tab and are used to control Inertia's general functions.



When the Calc button is clicked Inertia will calculate the metrics for whichever subject is selected based on the subject measurements provided.

Export V3D


Help Menu

The help menu is used to view information about the Inertia program and to find help online.



The Help button located under the Help menu will bring you to the Inertia Overview Page should you require further assistance with the program




The "About" button located under the Help menu opens a window that has details on Inertia including licensing key, activation code, version number, release date, development details, copy right information, and support contact information. The About window also has the "Deactivate Application" button which is used to deactivate Inertia. This does not uninstall the application however it does render it unusable by removing the licensing key. This is useful if you want to move your program from one computer to another instead of purchasing another licensing key. Please only use this button if you wish to completely deactivate the copy of Inertia on the computer you are working on. You will be presented with a dialogue confirming that you wish to deactivate. Once the licensing key is deactivated you can use it on a different computer.

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