simtk.org

Hello all

I am currently running the muscle analysis tool. Is there a way to declare what coordinates and corresponding analysis (i.e. moment arms) in the xml setup file for the muscle analysis tool. It seems to be running it for all my coordinates and its calculating results (tendon-force length) that I have no interest in.

thanks in advance
David Walker

David -

If you go to Help -> XML Browser -> MuscleAnalysis you will find all of the settings you can specify for the Muscle Analysis. This info is specified in the Analysis setup file. You can also change these parameters by going to the Analyze Tool -> Analyses Tab -> Add a Muscle Analysis -> Edit. You can use the muscle list and coordinate list to choose a subset based on what you're interested in.

Jen

<MuscleAnalysis>
<!--Flag (true or false) specifying whether whether on. True by default.-->
<on>true</on>
<!--Start time.-->
<start_time>-Inf</start_time>
<!--End time.-->
<end_time>Inf</end_time>
<!--Specifies how often to store results during a simulation. More specifically, the interval (a positive integer) specifies how many successful integration steps should be taken before results are recorded again.-->
<step_interval>1</step_interval>
<!--Flag (true or false) indicating whether the results are in degrees or not.-->
<in_degrees>true</in_degrees>
<!--List of muscles for which to perform the analysis. Use 'all' to perform the analysis for all muscles.-->
<muscle_list> all</muscle_list>
<!--List of generalized coordinates for which to compute moment arms. Use 'all' to compute for all coordinates.-->
<moment_arm_coordinate_list> all</moment_arm_coordinate_list>
<!--Flag indicating whether moments should be computed.-->
<compute_moments>false</compute_moments>
</MuscleAnalysis>

Thanks Jen,

I'd also add that there's no granularity as to what quantities are reported by the muscle analysis except to specify if moments/moment-arms are needed. All other quantities we almost get for free, computationally, so they're reported anyway.

-Ayman

Thanks Jen and Ayman. This helped immensly!!!