Relationship between CMC calculated muscle force and model isometric force

[marco xu]

Hi, recently I'm trying to build a subject-specific model in opensim.
While I find that the isometric force of gait2354 will not be scaled during the scale part.
So I'd like to know if MIMF(maximum isometric force) will affect the result of CMC.

I change the standard gait2354 model's all muscle's MIMF to double, then all the results muscle force becomes nearly double.(I think it's mainly from the passive muscle force as the result of double the value of MIMF of model.)
While the activation calculated are nearly a half.

So how do I scale the MIMF of my model?
How does MIMF influence the CMC result?(force/activation)

[Mohammadreza Rezaie]

Hi,

Handsfield2014 is a good source in this regard [https://pubmed.ncbi.nlm.nih.gov/24368144/]. The implementation of his regression equation in MATLAB or Python can be found here:

https://github.com/aaronsfox/predictive ... Specific.m
https://github.com/rebrik/OpenSimFullBo ... ons.py#L52

Hope this helps,