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I am currently doing a static optimization to get the activations in upper limb muscles. CAn anyone suggest me some reliable source or papers from where I can get, how muscle length, fiber length and tendon length changes with elbow flexion angles. How Opensim get those data? Thanks in advance

Hi, Sujash. I recommend that you post your question on the OpenSim forum. Simbody is a general-purpose multibody dynamics code that OpenSim uses when performing musculoskeletal simulations.