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Dear All,

I have a marker data of a subject walking on treadmill using VICON. I also having some of the muscle EMG data.
I want to import these data to opensim. One target is to compare between muscle activation calculated by opensim, and the resulted actual EMG data. And Also I would like to see if I can add both marker data and EMG data to opensim to calculate other muscle activations.

One problem I have is that Marker by VICON is scaled in 60Hz, while the EMG data scaled by 1000Hz. what shall I do? Any suggestion?

Also, Do you know any paper that do compare between actual EMG data, and muscle activation calculated by opensim?

I would also like to do something similar to what fadyalnajjar was doing. Was any solution found?

Hi Marika,

There are multiple tools on the simtk.org website to process Vicon motion data, in particular https://simtk.org/home/lee-son and a set of Matlab scripts to do the same from c3D files if you can output those on other projects https://simtk.org/project/xml/downloads ... oup_id=660 and https://simtk.org/home/c3dtoolbox

Please try these and let us know how it goes. You typically use marker data only to solve InverseKinematics, while simulation/analysis results are computed at a higher frequency/sampling rate. How you normalize EMG and compare it to activations is a more involved question that you'll need to address then.

Best of luck,
-Ayman