Static trial

For biomechanical applications, marker-based motion capture sessions usually begin with a static trial. Its purpose is to define the biomechanical model, which will then be applied to dynamic trials when the data is processed.

If you are running a QTM analysis module such as Clinical Gait, you will see the static trial listed first in the project automation pane.

Note that some marker sets include static-only markers, which will be removed after the static trial is complete. 

To record the trial:

• Have your subject stand in the recording volume in the static pose associated with the biomechanical model you’re using. Examples include the anatomical neutral position, the ski-pole position, and the A-pose.

  

• If force data is being collected, the subject should stand with one foot on each force plate or both feet on a single plate.

  

• The subject should hold as still as possible while the static trial is captured, which can be just a few seconds.

  

Before moving on to the dynamic trials, it’s important to confirm that the static capture was successful:

• Review the file to make sure that all the markers are visible and identified correctly.

  

• You can crop the file to a shorter section to exclude movement or other issues.

  

• Remember to save the file (Ctrl+S) after making any changes.

  

Static-only markers from your marker set should now be removed from the subject.