|
Post by dubiousgolfer on Jul 25, 2019 9:25:30 GMT -5
Dr Mann
Here is a video of Juan Postigo Arce showing a face on view of his golf swing (see below video at 0:22 - 0:28). If you look closely, just before he reaches P4 , his pelvis starts to rotate (anti-clockwise from a top view). But his left leg is not extending (while his pelvis is squaring) so it is not pushing the left hip joint back and up.
So my question is what muscles is he using to square his pelvis between P4 and P5?
It can't be contraction of his left pelvic rotary muscles because he is weight pressuring his left hip joint and this would cause his pelvis to move clockwise (away from target line from a top view).
Is it his lower abs 'internal/external obliques' that are being used to somehow square the pelvis between P4 and P5?
DG
PS. The reason, I thought the obliques were involved was because of this video below from 0:01 - 0:07.
I was looking at the lower yellow arrow at around 0:06-0:07 and the muscles seem to be attached to the pelvic crest . So if the right left hip joint side of that skeleton was somehow fixed in space (ie. right left hip joint pressure weighted) and then the left sided external oblique contracted (with the right side of pelvis free floating in space), wouldn't that cause the pelvis to rotate anti clockwise (from a top view)?
|
|
|
Post by imperfectgolfer on Jul 25, 2019 16:52:24 GMT -5
Dr Mann Here is a video of Juan Postigo Arce showing a face on view of his golf swing (see below video at 0:22 - 0:28). If you look closely, just before he reaches P4 , his pelvis starts to rotate (anti-clockwise from a top view). But his left leg is not extending (while his pelvis is squaring) so it is not pushing the left hip joint back and up. So my question is what muscles is he using to square his pelvis between P4 and P5? It can't be contraction of his left pelvic rotary muscles because he is weight pressuring his left hip joint and this would cause his pelvis to move clockwise (away from target line from a top view). Is it his lower abs 'internal/external obliques' that are being used to somehow square the pelvis between P4 and P5? DG PS. The reason, I thought the obliques were involved was because of this video below from 0:01 - 0:07. I was looking at the lower yellow arrow at around 0:06-0:07 and the muscles seem to be attached to the pelvic crest . So if the right hip joint side of that skeleton was somehow fixed in space (ie. right hip joint pressure weighted) and then the left sided external oblique contracted (with the left side of pelvis free floating in space), wouldn't that cause the pelvis to rotate anti-clockwise (from a top view)? I suspect that he is using an active contraction of his left adductor magnus muscle between P4 and P5 to rotate his pelvis counterclockwise towards his weight-pressure loaded and stabilised left femur. He then probably contracts his left gluteus maximus muscle to extend his left hip joint and pull it further counterclockwise in the later downswing. He probably also contracts his external obliques muscles and certain back muscles during his downswing in order to rotate his mid-upper torso counterclockwise. I suspect that his pelvic rotation during his followthrough is passive - and that it gets pulled more counterclockwise by the continued rotation of his upper torso. Jeff.
|
|
|
Post by dubiousgolfer on Jul 25, 2019 17:02:43 GMT -5
Many thanks Dr Mann
DG
|
|