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For the same set of tendon-to-fiber length ratios (0.5, 1.0, 2.0, 4.0, and 7.0), run a forward simulation of isokinetic contraction. For each ratio, ensure the sum of the tendon slack length and the optimal fiber length is constant (i.e.,
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| body | \ell_{\mathrm{s}}^{\mathrm{T}} + \ell_{\mathrm{o}}^{\mathrm{M}} = 0.3\,\text{m} |
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). Use the controls and initial states files from the previous section. To calculate the muscle forces, you will use the Analyze Tool to recreate the force profiles given the known information. As discussed in the introduction to this example, the activation, fiber length, and fiber shortening/lengthening velocity are needed to calculate the muscle force using a Millard2012EquilibriumMuscle model. Given the excitation history, the activation history can be determined using the
first-order activation dynamic model. The loaded motion for the block kinematics is used to calculate the muscle fiber length and velocity at each time step. The Analyze Tool uses this information to calculate the muscle force applied to the block.
For more background on the Analyze Tool, see the Analyses page in the User Guide.
Perform the following tasks for each tendon-to-fiber length ratio:
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