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Muscle-Tendon Personalization

Explanation​

Muscle-Tendon Personalization is used to edit the muscle-tendon properties of a model to match the subject-specific data provided. Specifically, MTP uses EMG-driven modeling to personalize the following muscle-tendon properties:

  • Electromechanical delay
  • Activation time constant
  • Activation nonlinearity constant
  • EMG scale factor
  • Optimal fiber length
  • Tendon slack length
  • Synergy Weights and Commands (if using SynX)

Inputs​

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Outputs​

  • Updated NMSM Pipeline model file containing muscle model parameters for every muscle (.osimx)
  • modelMoments.sto: calculates the joint moments of the model throughout the motion
  • muscleActivations.sto: calculates the muscle activation values through the motion

Importance​

MTP is based on a paper by Meyer, et al., in which they demonstrated that personalizing muscle-tendon parameters can greatly improve accuracy of the model. In particular, they found that model accuracy errors improved by 25% when compared to using the same modeling method without the muscle-tendon adjustments.