Hi Kat, Thanks for a great plug-in! In your webinar you mentioned that activations could be weighted by changing their constant in the synergy matrix. You said changing a muscle's constant from 1 to 0.1 for example would essentially 'penalize' activation of that muscle. Can you describe in a little ...

I am expecting low levels of activation in some muscles but also high levels in others. My question really is a physiological one though -- I am wondering if when a muscle gets stronger (i.e. its maximum isometric force property increases) does the passive muscle force property also scale proportion...

Hi, I am working on developing a model and found that some of the muscles in my model are weak when I run Static Optimization (high reserves for a given DOF and muscles maxing out at 1 when they activate). Consequently, I scaled up the maximum isometric force property for these muscles which resolve...

Does anybody know when the Fmax was increased in this model, was the passive force property adjusted also so that the active and passive force relationships remained the same despite increased max isometric force? If so, how did they adjust the passive force property so that it scaled with the incre...

Hi there,

This may or may not be your problem, but I get this error message when the degrees of freedom (DOFs) in my model do not line up with the DOFs in my RRA Actuators or RRA Tasks file. Every DOF in your model that is not constrained must be in both of these files.

Hope this helps!

Hi, I am interested in determining the height of the Gait2392 model. Using the Gait2392_simbody.osim file I put one marker on the top of the model's head and one marker on the bottom of the model's foot and calculated the linear y distance in the ground frame. It came out to be about 1.66 m, however...

Thanks so much for the help and the quick reply! I figured out the issue was occurring because I was using an RRA Actuators file in the Static Optimization setup instead of a CMC Actuators file. After I switched to using CMC actuators, my SO activations and forces are much closer in magnitude to tho...

Hi, I am interested in examining muscle forces and activations during human running. I have worked quite a bit with CMC but am now starting to experiment with possibly using static optimization instead in order to save computational time. My goal is to alter certain muscle properties and see the com...

Was this issue solved? I am having the same issue with both the current version and the beta version. I checked the csv file and it doesnt look like there is any obvious header mismatching. Thank you for the help!

Margaret

Hi, I am having trouble using the GaitExtractToolbox to pull jogging experimental data from Vicon. Sometimes, with some subjects, the data pulls perfectly fine. However, probably about 50% or more of the time only 1 of the 2 force plate GRF data pulls. Its always the 2nd GRF that will pull while the...