Hi Ross, Thanks for the suggestion. Yes, I have checked the activations of the second muscle following the simulations. I double checked that the second muscle is not excited in the input controls file and is not active in the output states file. I use CMC to obtain the excitations that drive the co...

Hi all, I've been running forward dynamic simulations to investigate the action of two muscles acting as synergists but I've come across a problem that makes little sense to me. I firstly obtain the controls and initial states of one muscle through CMC. I use these results to active one muscle. Then...

Hi Colin, Thanks for the reply! I also suspected that the high residual forces were a result of the reaction forces at the seat and/or handlebars. Like you've suggested, I've decided to try and run my CMC simulations in two different ways, one with a fixed pelvis in space and another without running...

Dear all, I'm currently trying to run some experimental cycling data through RRA in preparation for CMC simulations. However, because I'm using a lower-limb model without a torso or arms, I get large residual forces in the vertical direction roughly equally the weight of the subject. These large res...

Hi Jack, In my experience, CMC does include tendon compliance for Millard2012EquilibriumMuscle muscle models. CMC takes into account both the length AND velocity of the tendon component when computing muscle forces (and hence muscle excitations) to drive the model towards the desired kinematics. Als...

Hi everyone, I'm currently working on a project to try and calculate elastic power/energy in the plantarflexors in walking and running using OpenSim. To calculate the power, I'm using the forces determined through static optimisation and the lengths determined through muscle analysis. However, when ...