Muscle force

[Samane Amini]

Hello

According to the following muscle force formulation, I would like to get muscle properties.

fff.PNG (20.66 KiB) Viewed 157 times

where fL is the active-force-length curve, fV is the force-velocity curve, and fPE is the passive-force-length. However, there aren't these properties in LuaMuscle :https://scone.software/doku.php?id=ref:lua_muscle

Is active_fiber_force()*fiber_length() equal to active-force-length?

Would you pls guide me on how to get them?

Thanks

[Thomas Geijtenbeek]

Perhaps you mean muscle:active_force_length_multiplier()?

[Samane Amini]

I need fL, fV, and fPE.

you mean fl is active_force_length_multiplier().

How about fV and fPE?

[Thomas Geijtenbeek]

Please see the documentation for the available functions:

https://scone.software/doku.php?id=ref:lua_muscle

[Samane Amini]

I mean the force-velocity and passive-force-length are not available in:
https://scone.software/doku.php?id=ref:lua_muscle

[Thomas Geijtenbeek]

All these curves are available as part of the model, I'm not sure I understand why you would want to compute them in real-time during the simulation.

In any case, if you really need them, you can derive fPE from passive_fiber_force() and fV from the muscle_force() and fiber_velocity().