5. Hill-Type Model

The chapter introduces a Hill-type simulation model, enhancing the comprehension of factors influencing force production, especially in patients with neuromuscular disorders. The chapter, using the model as a guide, explores factors such as muscle fiber length, muscle-tendon properties, and architecture. This chapter, employing the Hill-type model, facilitates understanding for nonphysiologists and nonanatomists by providing mathematical equations to comprehend the role of muscle-tendon unit mechanics in force production. Despite its benefits, the model has limitations, notably its inability to account for tendon viscoelastic properties and the challenge of representing overall muscle belly characteristics with a single muscle fiber. We discuss such constraints in this chapter as well.