How Knee Angle Changes Which Calf Muscle Works Hardest
Selective Recruitment of the Triceps Surae Muscles With Changes in Knee Angle
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Researchers measured electrical activity in four lower leg muscles while people did calf raises with their knees bent at different angles. They found that changing the knee angle directly changes which muscle gets the most work.
Practical Takeaways
Adjust your knee angle during calf raises to specifically target your desired calf muscle: keep knees bent at 90 degrees for the soleus, and fully extend legs to 180 degrees for the medial gastrocnemius.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Researchers measured electrical activity in four lower leg muscles while people did calf raises with their knees bent at different angles. They found that changing the knee angle directly changes which muscle gets the most work.
Practical Takeaways
Adjust your knee angle during calf raises to specifically target your desired calf muscle: keep knees bent at 90 degrees for the soleus, and fully extend legs to 180 degrees for the medial gastrocnemius.
Publication
Journal
Journal of Strength and Conditioning Research
Year
2002
Authors
J. Signorile, B. Applegate, M. Duque, Natalie H Cole, Attila J. Zink
Related Content
Claims (4)
Bending your knee to 90 degrees makes your soleus calf muscle work better than keeping it completely straight. This happens because of how the muscle is built and how its length changes with different knee angles. So, if you want to activate this muscle most effectively during movements like calf raises, keeping a slight bend in your knee is best.
When you do calf exercises like heel raises, the electrical activity in the outer part of your calf muscle stays about the same no matter how bent your knee is. This is different from the inner calf muscles, which change their activity depending on your knee angle.
When you do calf raises, the front muscle of your shin stays much quieter than the back muscles of your calf, no matter how you bend your knee or how heavy the weight is. This steady pattern shows that the shin muscle acts as a counterbalance while the calf does the main lifting work.
When you point your toes while keeping your knee straight, your inner calf muscle works much harder than the muscles around your shin and ankle. This happens because straightening your knee naturally changes how your body activates different leg muscles during exercises.