Muscle Force

[hongjie hou]

Hello everyone,
I want to know the detailed calculation process of muscle force. I do not know how to determine the force-length relation and force-velocity relation of muscle. is there any method to determine the data?
thanks,
hongjie

[Thomas Uchida]

You can find information and citations in the "Muscle Model Theory and Publications" section of the Confluence documentation (https://simtk-confluence.stanford.edu:8 ... blications). See, for example:
- Zajac, F.E. (1989) Muscle and tendon: properties, models, scaling, and application to biomechanics and motor control. Critical Reviews in Biomedical Engineering, 17(4):359-411. http://europepmc.org/abstract/MED/2676342
- Millard et al. (2013) Flexing computational muscle: modeling and simulation of musculotendon dynamics. ASME Journal of Biomechanical Engineering, 135(2):021005. https://doi.org/10.1115/1.4023390

I do not know how to determine the force-length relation and force-velocity relation of muscle. is there any method to determine the data?

Please see the papers referenced in Millard et al. (2013) and listed at the bottom of this page: https://simtk-confluence.stanford.edu:8 ... don+Curves.

[hongjie hou]

Hi Thomas

Thanks for the reply.I hava found active force-length relationship and passive force-length relationship.But I don't seem to find force-velocity relationship. And What is the relationship between 'Af' and 'force-velocity curve'?Where can I find the relationship between for force-velocity curve.It seems that the formula for f-v is not given in the literature.

Hongjie

[Thomas Uchida]

Based on your third attachment, I assume you are using the Thelen2003Muscle model. Please see the following references:
- "Thelen 2003 Muscle Model" page in the Confluence documentation: https://simtk-confluence.stanford.edu:8 ... scle+Model
- API documentation for the Thelen2003Muscle class: https://simtk.org/api_docs/opensim/api_ ... ml#details
- The Appendix of Thelen, DG (2003) "Adjustment of muscle mechanics model parameters to simulate dynamic contractions in older adults", https://doi.org/10.1115/1.1531112