Muscles in sit to stand

• Flexion momentum:

  • Tibialis anterior works to help position the foot and also produces a concentric contraction to bring tibial shaft forward
  • Iliopsoas would also be working to be producing the trunk flexion movement
  • Most of the back extensor muscles would be working isometrically to maintain spinal extension

  
• Momentum Transfer:

  • Tibialis anterior continues to produces a dorsiflexion action
  • Soleus is an antagonist to tibialis anterior, working eccentrically, producing a plantarflexion action
  • Vastus lateralis works to stop knee collapsing forward and then works concentrically to produce an extension movement

  
• Extension:

  • Soleus and gastrocnemius work to pull the ankle into plantarflexion
  • Hip and knee extensors work
  • Tibialis anterior works eccentrically acting as an antagonist to soleus and gastrocnemius