I’m studying different exercise compensations and the associated underactive and overactive muscles that might be contributing to the problem… I really want to be able to think about the problem and apply it, not just memorize answers. Some just don’t make sense to me (even after looking at muscle insertions, origins, & actions). For example, the book states a knee moving inward on a single leg squat, overactive muscles = biceps fem(s.h.), lateral gastroc, and vastus lateralis. That doesn’t make sense to me given its actions. Can someone maybe help me find a different way to look at it so it makes better sense to me? Thx!
here is my understanding of it, using our example of the SL squat:
In the ideal world, a person doing a SL squat would do it in a way that the knees are tracking over the toes. That’s when all the major muscles involved have the correct postural starting point and none of them are lengthened or shortened before movement begins.
When you see this kind of compensation, it indicates that the gluteus medius is too weak to counteract the actions of the others, and thus the knee moves towards the mid-line. It does not mean that the ‘overactive’ muscles are super-strong but that the whole relationship between the muscles is off. Prolonged sitting can cause this chronic shortening for example.
That is the reason for the recommendation of doing SMR for the ‘overactive’ muscles followed by stretching to restore the proper relationship between muscles.
Does that help?