The full body plugin gait model output in Vicon Nexus provides the estimated location of the Center of Mass.
How can the location (XYZ) of the COM can be calculated only with lower body Plugin Gait marker trajectories in a dynamic task?
P.S.: The subjects are athletes (volleyball players).
I'm not sure this can be done in Vicon, but in your post processing you can estimate the COM from the centroid of the pelvis markers. To do that, just find the average of the AP position of the RASI, LASI, RPSI, LPSI (or SACR if you use that instead of the PSIS) at every time point. Repeat as needed for the mediolateral position and vertical positions. That's something that wouldn't even be that difficult to do in Excel and is quite easy in matlab.
Independent of whether you do that in Vicon or any other program, if you use only the lower body markers, you will get quite big an error in your calculations because you don't know the position of the upper body, especially the trunk, which will greatly impact the location of the COM. I would suggest you use at least one marker on the torso in addition to the lower body markers.
- Badges
- Science topic
- Similar topics
- Mathematics