Okay...Okay....say hello to my little friend. (just kidding).
Boy Tong, I am starting to look like I have a vendetta! I dont, trust me. I love your enthusiasm and posts.
However...once again...I respectfully disagree.
May I ask where in the book your reference is for this? The best of my knowledge is in 2-G, the 'true rotation of the hands' in impact with no relation or reference to 'turned' to 'vertical'. Moreover, Swivel is not mentioned in 4-C. 4-C are specific Wrist positions - versus 'Swivel' which is more general and not limited to specificity in that context.
This isnt necessarily for you....but....can anyone show me where 'start up' swivel is in the book? Just curious. Not that its not in it - I just dont remember it, nor can I find it (yes - I have my book now!).
Disagree once more. If the entire left forearm wedge is onplane (the entire left arm) - the left shoulder must be onplane...and on the backstroke, I feel it would need to be above plane (due to no axis tilt)....
Again...not trying to nitpick, and love the posts, etc. But in a public forum, much can be mistrued. And - if I am wrong - which Lynn has pointed out on multiple occasions on TGM forum - I am all for learning!!!
Patrick
Hi Patrick,
I love the way you question things.
Too many people take it for granted that whatever has "been around" has to be correct.
Nothing could be further from the truth. As we have all found out in our own lives from time to time, a myth usually develops a life of its own and then before we even realise it, we take it to be the "Truth."
Instead, we all need to adopt an attitude just like yours. It is like in the book of Acts where "the Bereans searched the scriptures daily to see if it were so."
Previous planar models of the downswing in golf have suggested that upper limb segments (left shoulder girdle and left arm) move in a consistent fixed plane and that the clubhead also moves only in this plane. This study sought to examine these assumptions. Three-dimensional kinematic analysis of seven right-handed golfers of various abilities (handicap 0- 15) was used to define a plane (named the left-arm plane) containing the 7th cervical vertebra, left shoulder and left wrist. We found that the angles of this plane to the reference horizontal z axis and target line axis (parallel to the reference x axis) were not consistent. The angle to the horizontal z axis varied from a mean of 133 degrees (s = 1 degrees) at the start of the downswing to 102 degrees (s = 4 degrees) at impact, suggesting a "steepening" of the left-arm plane. The angle of the plane to the target line changed from - 9 degrees (s = 16 degrees) to 5 degrees (s = 15 degrees) during the same period, showing anticlockwise (from above) rotation, although there was large inter-individual variation. The distance of the clubhead from the left-arm plane was 0.019 m (s = 0.280 m) at the start at the downswing and 0.291 m (s = 0.077 m) at impact, showing that the clubhead did not lie in the same plane as the body segments. We conclude that the left arm and shoulder girdle do not move in a consistent plane throughout the downswing, and that the clubhead does not move in this plane. Previous models of the downswing in golf may therefore be incorrect, and more complex (but realistic) simulations should be performed.
Previous planar models of the downswing in golf have suggested that upper limb segments (left shoulder girdle and left arm) move in a consistent fixed plane and that the clubhead also moves only in this plane. This study sought to examine these assumptions. Three-dimensional kinematic analysis of seven right-handed golfers of various abilities (handicap 0- 15) was used to define a plane (named the left-arm plane) containing the 7th cervical vertebra, left shoulder and left wrist. We found that the angles of this plane to the reference horizontal z axis and target line axis (parallel to the reference x axis) were not consistent. The angle to the horizontal z axis varied from a mean of 133 degrees (s = 1 degrees) at the start of the downswing to 102 degrees (s = 4 degrees) at impact, suggesting a "steepening" of the left-arm plane. The angle of the plane to the target line changed from - 9 degrees (s = 16 degrees) to 5 degrees (s = 15 degrees) during the same period, showing anticlockwise (from above) rotation, although there was large inter-individual variation. The distance of the clubhead from the left-arm plane was 0.019 m (s = 0.280 m) at the start at the downswing and 0.291 m (s = 0.077 m) at impact, showing that the clubhead did not lie in the same plane as the body segments. We conclude that the left arm and shoulder girdle do not move in a consistent plane throughout the downswing, and that the clubhead does not move in this plane. Previous models of the downswing in golf may therefore be incorrect, and more complex (but realistic) simulations should be performed.
"Three-dimensional kinematic analysis of seven right-handed golfers of various abilities (handicap 0- 15) was used to define a plane (named the left-arm plane) containing the 7th cervical vertebra, left shoulder and left wrist."
Maybe those guys at Edinburgh would have got better results by using something other than C7 as the pivot centre ...but you're probably far ahead of me .
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Hybrid Mode
