foweyman wrote:Here’s a demonstration and explanation to illustrate the non-stretchability of the 3 vastus muscles of the quads: Lay on your back. Bring your knee near your chest (flex the hip) so the femur is at a roughly 45 degree angle with the spine. Using arms, pull down on lower shin, forcibly flexing the knee. No matter how hard you pull, none of the quads will be getting stretched, and this isn’t how ‘quad stretches’ are done. Now, put the hip in an extended position, like any of the three ‘quad’ stretches in the referenced page. This will allow the rectus femoris to be stretched because the point where it attaches to the pelvis is now further from its insertion at the knee. However the 3 vastus quads are not similarly affected because they aren’t attached to the pelvis, but to the upper femur, and therefore their length is independent of hip position. They receive no more stretch than when the hip was in the flexed position.
So I am not trying to beat this topic to death, or win a point. I actually enjoy discussions like this and any opportunity to learn.
I’ve seen that exact argument, or scenario before, that the Vasti are not able to be stretched. In my case, since I have loose quads it is close to true although after a good thrashing carrying a heavy load etc. mine get tight enough to stretch.
Actually the first stretch you describe
is the one, as hip flexion keeps the rectus out of the picture while changing nothing regarding the Vasti.
From “The Anatomy of Movement” by Blandine Calais-Germain, pg. 219
“The three vasti can be stretched by full flexion of the hip and knee.”
I agree that the mechanics of this stretch are very limited, but again it really depends on the individual. I see people frequently who cannot fully flex their knee. When we add hip flexion (to take rectus femoris out of the picture) it becomes apparent that the tightness is indeed in the Vasti (assuming there is not a problem in the knee joint.)
My own experience is that I can usually do the reclining hero pose beautifully without preparation. But after a big day I will need to warm into the pose by getting to those vasti with the hip flexed first.
In other words, I think there is validity to your point to the extent that bio-mechanically the ability to stretch the Vasti of the Quads is very limited, and if they are loose they will not really stretch. But, these muscles do lengthen and shorten as the knee flexes and extends and in some people they do get tight enough to limit the range of motion of the knee. When this occurs stretching is possible.