The Study
Selective Recruitment of the Triceps Surae Muscles With Changes in Knee Angle
This study takes a snapshot of how muscles light up with electricity when people bend their knees at different angles during one workout. It can show us which muscles are more active at certain positions, but it cannot prove that doing these exercises will actually make those muscles stronger or bigger over time.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
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.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 520 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Not specified in abstract
- 2Not specified in abstract
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
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)
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.
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.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.