Our preliminary results suggest that medial hamstring-quadriceps co-activation may constrain ACL elongation, however if lateral activation exceeds medial then ACL elongation might ensue.
The quadriceps muscles include the rectus femoris and the vastus ... It usually possesses a median ridge that divides the proximal patella into medial and lateral facets, and the medial facet is ...
The step-up with deliberate co-activation resulted in greater activation of the hamstrings, greater co-activation indices for semimembranosus-vastus medialis and biceps femoris-vastus lateralis ...
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