Post by dubiousgolfer on May 12, 2023 11:43:16 GMT -5
Dr Mann
I have been reviewing this section of your 'Downswing' chapter on your website :
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Image 1 shows a neutral position where I am holding my left wrist in a neutral cocked position approximately half-way between being fully upcocked (fully radially deviated) and fully downcocked (fully ulnar deviated). Note that the back of my left wrist looks to be slightly cupped (scooped) because I have adopted a weak left hand grip. Note that the clubshaft is straight-line-aligned with the black-taped area of my lower left forearm and that they are both in the same plane.
Image 2 shows my left wrist in an upcocked position (position of radial deviation) and one can see that the back of my left wrist looks to be more cupped.
Image 3 shows my left wrist in an uncocked position (position of ulnar deviation) and one can see that the back of my left wrist looks far less cupped and borderline anatomically flat or slightly bowed (minimally palmar flexed).
Note that both radial deviation of my left wrist and ulnar deviation of my left wrist does not disrupt the GFLW/intact LFFW alignment. I strongly recommend that all readers of this review paper confirm my above biomechanical claims by personally repeating this demonstration at home. Note that it is an obvious biomechanical fact that in order for a golfer (who uses a weak-neutral left hand grip) to maintain a GFLW all the way throughout the entire downswing between the P4 position (where the left wrist is radially deviated) to impact (where the left wrist is ulnar deviated), the left wrist angle must continuously change from being significantly dorsiflexed at P4 to becoming far less dorsiflexed (and even slightly palmar flexed) by impact.
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On closer inspection , doesn't it look like your wrist has undergone a slight circumduction in image 2 and 3 ?
Image 2: Your left wrist has extended slightly while it has radially deviated, but the forearm has also slightly pronated. This is why the club shaft can remain generally straight-line-aligned in the same plane as the black taped area on your lower left forearm.
You can easily visualise this by imagining what would happen to the shaft in image 1 if you just extended your wrist slightly. The shaft would shift like the yellow line in image 1 below so that it breaks the intact LFFW , but then a slight forearm pronation would bring it back in line as shown in image 2.
If in image 1 you slightly palmer flexed your lead wrist while performing ulnar deviation, the shaft orientation would shift as per the red line in image 1 and break the intact LFFW. But a slight supination of the left forearm will bring the red line (ie. shaft) back in line to retain an intact LFFW as shown in image 3.
Therefore , isn't your wrist performing circumduction, which is a mix of 'wrist extension /radial deviation/pronation' and 'wrist flexion/ulnar deviation/supination' to keep an intact LFFW? That in reality, there is no 'perfectly' intact GFLW (although it is a good concept to try and achieve)?
DG
I have been reviewing this section of your 'Downswing' chapter on your website :
---------------------------------------------------------------------------
Image 1 shows a neutral position where I am holding my left wrist in a neutral cocked position approximately half-way between being fully upcocked (fully radially deviated) and fully downcocked (fully ulnar deviated). Note that the back of my left wrist looks to be slightly cupped (scooped) because I have adopted a weak left hand grip. Note that the clubshaft is straight-line-aligned with the black-taped area of my lower left forearm and that they are both in the same plane.
Image 2 shows my left wrist in an upcocked position (position of radial deviation) and one can see that the back of my left wrist looks to be more cupped.
Image 3 shows my left wrist in an uncocked position (position of ulnar deviation) and one can see that the back of my left wrist looks far less cupped and borderline anatomically flat or slightly bowed (minimally palmar flexed).
Note that both radial deviation of my left wrist and ulnar deviation of my left wrist does not disrupt the GFLW/intact LFFW alignment. I strongly recommend that all readers of this review paper confirm my above biomechanical claims by personally repeating this demonstration at home. Note that it is an obvious biomechanical fact that in order for a golfer (who uses a weak-neutral left hand grip) to maintain a GFLW all the way throughout the entire downswing between the P4 position (where the left wrist is radially deviated) to impact (where the left wrist is ulnar deviated), the left wrist angle must continuously change from being significantly dorsiflexed at P4 to becoming far less dorsiflexed (and even slightly palmar flexed) by impact.
-------------------------------------------------------------------------------------
On closer inspection , doesn't it look like your wrist has undergone a slight circumduction in image 2 and 3 ?
Image 2: Your left wrist has extended slightly while it has radially deviated, but the forearm has also slightly pronated. This is why the club shaft can remain generally straight-line-aligned in the same plane as the black taped area on your lower left forearm.
You can easily visualise this by imagining what would happen to the shaft in image 1 if you just extended your wrist slightly. The shaft would shift like the yellow line in image 1 below so that it breaks the intact LFFW , but then a slight forearm pronation would bring it back in line as shown in image 2.
If in image 1 you slightly palmer flexed your lead wrist while performing ulnar deviation, the shaft orientation would shift as per the red line in image 1 and break the intact LFFW. But a slight supination of the left forearm will bring the red line (ie. shaft) back in line to retain an intact LFFW as shown in image 3.
Therefore , isn't your wrist performing circumduction, which is a mix of 'wrist extension /radial deviation/pronation' and 'wrist flexion/ulnar deviation/supination' to keep an intact LFFW? That in reality, there is no 'perfectly' intact GFLW (although it is a good concept to try and achieve)?
DG