Post by dubiousgolfer on Jul 15, 2019 4:29:07 GMT -5
Dr Mann
Looking at this video below, Brendon DeVore described some of the tests he was doing on creating swing speed up to 2:05 . Then he asked Dr Scott Lynn why his swing speed was greater when he created more weight pressure on his right leg while leaving his left leg almost floating off the ground. But I couldn't understand if Dr Lynn actually answered that specific question.
I remember you did an article on one legged golfer 'Manuel De Los Santos' who could drive the ball a long way on just his right leg and you explained that he was using his lateral pelvic rotary muscles to help rotate his pelvis (over a weight pressured right hip joint). But the primary reason for his swing speed was the 'due to the active muscular contraction of the core muscles of his mid-upper torso' (here is an extract of your article below).
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Image 1 shows him at the P4 position. Notice that he has a flexed right knee and that his left hemipelvis is slightly higher than his right hemipelvis. I believe that the positive O factor (elevated left pelvis) is due to the fact that he twisted his mid-upper torso clockwise during his backswing and stretched the core abdominal muscles that extend from the front of his left pelvis to his right mid-upper chest wall.
Image 2 shows the start of his downswing action. His left pelvis drops to a lower level because the stretched core muscles of his mid-upper torso are starting to contract so that he can rotate his mid-upper torso counterclockwise. Between P4 and P4.4, the rotation of his mid-upper torso is relatively horizontal (see curved red arrow in image 2) - note that his left shoulder socket moves horizontally.
Between P4.5-P5, you can see that his mid-upper torso is rotating in a slightly upwards direction as he continues to rotate his mid-upper torso counterclockwise (see curved red arrow in image 3). That causes his left shoulder socket's path to move upwards as it continues to move targetwards.
During this time period, he is using the core muscles of his mid-upper torso to rotate his mid-upper torso counterclockwise, and those core muscles are responsible for his swing power generation. His left pelvis is "free-floating" in space, and it is pulled passively in a counterclockwise direction by the rotating mid-upper torso. Because the rotational motion of the left pelvis is passive (and secondary to the active counterclockwise rotation of his mid-upper torso) it is irrational to talk about an active "pelvic firing" biomechanical phenomenon.
Note that his right knee starts to straighten in his mid-late downswing and that allows him to get more elevation of his left shoulder socket during his mid-late downswing. However, and most importantly, note that although the straightening right leg must elevate his right right pelvis, his left pelvis is always higher than his right pelvis during the mid-late downswing (images 4, 5, 6 and 7). That is only possible because the counterclockwise rotation of his mid-upper torso in an upwards-and-leftwards direction is the major source of his swing power, and the straightening right leg (which may be active only plays a secondary role)
Here are face-on capture images of his downswing-followthrough swing action.
His swing power is being generated between image 3 and image 6 - and it due to the active muscular contraction of the core muscles of his mid-upper torso, which cause his mid-upper torso to rotate counterclockwise, and which therefore cause his left shoulder socket to move leftwards-and-upwards. It the active motion of his left shoulder socket that powers his golf swing because it is primarily responsible for powering the release of PA#4, while the left shoulder girdle muscles play a secondary/synergistic role in the release of PA#4 by simultaneously abducting and depressing the left arm.
Here is an image showing the path of his left shoulder socket's motion during the P4.5-P7 downswing time period.
The number 3 represents his left shoulder socket position at P4.5 (see image 3 of the previous face-on images) and the number 6 represents impact (see image 6 of the previous face-on images).
Note that the left shoulder socket's path is mainly leftwards in the early downswing, and that it steepens more dramatically during the mid-late downswing. The steeper path of his left shoulder socket during the mid-late downswing is primarily due to the fact that he is pulling left-upwards with the left side of his mid-upper torso as he rotates his mid-upper torso counterclockwise, but it is synergistically assisted by the fact that he is simultaneously straightening his right leg and therefore lifting his right pelvis and sacrum.
He needs to get his left shoulder socket higher by impact in order to prevent hitting the ball "fat" (hitting the ground behind the ball). That's a mandatory requirement in all skilled golfers during the later downswing when the clubshaft is becoming progressively more straight-in-line with the left arm, which thereby progressively increases the swing radius.
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Question:
So why has Brendon DeVore increased his clubhead speed, while predominantly on his right leg? Could it be due to the fact that he has somehow been able to contract his core muscles of his mid-upper torso more efficiently than on 2 legs (which doesn't make sense to me)?
Or could it be that he has used PA#5 (right arm swinging) to release PA#4 which has somehow created more clubhead speed than a TGM (pivot releasing PA4#) swinging technique?
DG
Looking at this video below, Brendon DeVore described some of the tests he was doing on creating swing speed up to 2:05 . Then he asked Dr Scott Lynn why his swing speed was greater when he created more weight pressure on his right leg while leaving his left leg almost floating off the ground. But I couldn't understand if Dr Lynn actually answered that specific question.
I remember you did an article on one legged golfer 'Manuel De Los Santos' who could drive the ball a long way on just his right leg and you explained that he was using his lateral pelvic rotary muscles to help rotate his pelvis (over a weight pressured right hip joint). But the primary reason for his swing speed was the 'due to the active muscular contraction of the core muscles of his mid-upper torso' (here is an extract of your article below).
---------------------------------------------------------------------------------------
Image 1 shows him at the P4 position. Notice that he has a flexed right knee and that his left hemipelvis is slightly higher than his right hemipelvis. I believe that the positive O factor (elevated left pelvis) is due to the fact that he twisted his mid-upper torso clockwise during his backswing and stretched the core abdominal muscles that extend from the front of his left pelvis to his right mid-upper chest wall.
Image 2 shows the start of his downswing action. His left pelvis drops to a lower level because the stretched core muscles of his mid-upper torso are starting to contract so that he can rotate his mid-upper torso counterclockwise. Between P4 and P4.4, the rotation of his mid-upper torso is relatively horizontal (see curved red arrow in image 2) - note that his left shoulder socket moves horizontally.
Between P4.5-P5, you can see that his mid-upper torso is rotating in a slightly upwards direction as he continues to rotate his mid-upper torso counterclockwise (see curved red arrow in image 3). That causes his left shoulder socket's path to move upwards as it continues to move targetwards.
During this time period, he is using the core muscles of his mid-upper torso to rotate his mid-upper torso counterclockwise, and those core muscles are responsible for his swing power generation. His left pelvis is "free-floating" in space, and it is pulled passively in a counterclockwise direction by the rotating mid-upper torso. Because the rotational motion of the left pelvis is passive (and secondary to the active counterclockwise rotation of his mid-upper torso) it is irrational to talk about an active "pelvic firing" biomechanical phenomenon.
Note that his right knee starts to straighten in his mid-late downswing and that allows him to get more elevation of his left shoulder socket during his mid-late downswing. However, and most importantly, note that although the straightening right leg must elevate his right right pelvis, his left pelvis is always higher than his right pelvis during the mid-late downswing (images 4, 5, 6 and 7). That is only possible because the counterclockwise rotation of his mid-upper torso in an upwards-and-leftwards direction is the major source of his swing power, and the straightening right leg (which may be active only plays a secondary role)
Here are face-on capture images of his downswing-followthrough swing action.
His swing power is being generated between image 3 and image 6 - and it due to the active muscular contraction of the core muscles of his mid-upper torso, which cause his mid-upper torso to rotate counterclockwise, and which therefore cause his left shoulder socket to move leftwards-and-upwards. It the active motion of his left shoulder socket that powers his golf swing because it is primarily responsible for powering the release of PA#4, while the left shoulder girdle muscles play a secondary/synergistic role in the release of PA#4 by simultaneously abducting and depressing the left arm.
Here is an image showing the path of his left shoulder socket's motion during the P4.5-P7 downswing time period.
The number 3 represents his left shoulder socket position at P4.5 (see image 3 of the previous face-on images) and the number 6 represents impact (see image 6 of the previous face-on images).
Note that the left shoulder socket's path is mainly leftwards in the early downswing, and that it steepens more dramatically during the mid-late downswing. The steeper path of his left shoulder socket during the mid-late downswing is primarily due to the fact that he is pulling left-upwards with the left side of his mid-upper torso as he rotates his mid-upper torso counterclockwise, but it is synergistically assisted by the fact that he is simultaneously straightening his right leg and therefore lifting his right pelvis and sacrum.
He needs to get his left shoulder socket higher by impact in order to prevent hitting the ball "fat" (hitting the ground behind the ball). That's a mandatory requirement in all skilled golfers during the later downswing when the clubshaft is becoming progressively more straight-in-line with the left arm, which thereby progressively increases the swing radius.
---------------------------------------------------------------------------
Question:
So why has Brendon DeVore increased his clubhead speed, while predominantly on his right leg? Could it be due to the fact that he has somehow been able to contract his core muscles of his mid-upper torso more efficiently than on 2 legs (which doesn't make sense to me)?
Or could it be that he has used PA#5 (right arm swinging) to release PA#4 which has somehow created more clubhead speed than a TGM (pivot releasing PA4#) swinging technique?
DG