Muscle Second Order Activation Dynamic Model

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Andreas Christou
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Joined: Mon Mar 30, 2020 3:34 am

Muscle Second Order Activation Dynamic Model

Post by Andreas Christou » Wed Oct 21, 2020 5:31 am

Hello everyone,

Is it possible to change the muscle activation model through MATLAB? I noticed that one property of Millard2012AccelerationMuscle is 'MuscleFirstOrderActivationDynamicModel' and I can see in Doxygen that a class for 'MuscleSecondOrderActivationDynamicModel' exists. Is there a method that can be used to switch the activation dynamics of certain (or all) muscles from first order activation dynamics to second order activation dynamics? If yes, is this possible for other muscle models as well such as Millart2012EquilibriumMuscle?

Kind Regards,
Andreas
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Windows
OpenSim 4.1
MATLAB
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Carmichael Ong
Posts: 393
Joined: Fri Feb 24, 2012 11:50 am

Re: Muscle Second Order Activation Dynamic Model

Post by Carmichael Ong » Fri Oct 23, 2020 11:22 am

Looking at the source code, it seems that the first order model is hard-coded into the major muscle classes (both Millard class, Thelen class). I think you would have to go to the C++ level to make these changes.
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