Muscle Force Estimations after use of external force

[Bryan Tanner]

Hello,

I'm applying an external coordinate limit force about a joint to analyze the resulting Joint Reaction Force and Muscle Forces surrounding the joint in question, do you have any resources on the best pathway to take when implementing such an external force? i.e would performing CMC or Static Optimization be more effective after the implementation of said external force? Surely there are numerous assumptions regarding this question and the answer could even depend on what assumptions one is willing to make regarding muscle properties. The main difference I have seen between CMC and Static Optimization is the time difference, Static Optimization seems to perform reasonable similar to CMC and takes not nearly as much time, now I'm mostly wondering if the difference in assumptions between CMC and Static Op is going to make a difference when it comes to applying other external forces beyond GRFs, etc.?

Thanks for the help!

[Michael Asmussen]

Dear Bryan,

The answer to your question probably depends on your research question and whether you need CMC or SO. Have you read these references for CMC:

Thelen et al. (2003) "Generating dynamic simulations of movement using computed muscle control" J. Biomechanics, 36(3), 321-328

Thelen & Anderson (2006) " Using computed muscle control to generate forward dynamic simulations of human walking from experimental data" J. Biomechanics, 39(6), 1107-1115

If not, maybe start there.

All the best,

Mike