Post by imperfectgolfer on Feb 22, 2010 10:57:44 GMT -5
Dariusz wrote the following in his thread at BM's forum.
I have added my opinions in bold.
ad.1. Lateral flexion (bending to one side in the sagittal plane) of the spine in the downswing (secondary axis tilt) is dependent on the CoG shift in the pelvis area. Humans are bipedals, thus, the shift is a biomechanical necessity that happens automatically provided the motion is being guided sequentially from the ground up. IMO, the earlier the shift happens (see: post-accident Hogan where the shift happened before his upper part of the main body finished backswing) the better are chances to establish the rear elbow on the rear hip joint which guarantees perpendicularity of the rear forearm to the core.
I know of no biomechanical/mechanical necessity why the rear forearm must be perpendicular to the core.
ad.2. Shoulder rotation inwards happens unintentionally if the backswing is being lead with the rear side of the body. As said before, one of the golden rules I believe in is leading the motion with that body side that corresponds to the direction of the motion.
ad.3. The rear arm role in the downswing taking into account a very limited range of motion in the elbow joint (as you correctly noticed) is twofold in the macroscale - a) the humerus should tie its motion to the main body motion as much as possible, and b) the forearm should support the club as much as possible.
I know of no biomechanical/mechanical reason why it is imperative to tie the right humeral motion to the rotational motion of the core.
ad.4. The soundest from biokinetical point of view is merging the lead wrist deviation and the rear wrist flexion which can be achieved in only one way - merging strongish LH and weakish RH and forgetting not very wise IMO parallel V's theory. The natural position of the wrists when a golfer bends his spine forward - we shall find that neither "anatomical position" (palms are directed forward) nor "gorilla position" (palms are directed backwards) is natural for the wrists. When we stand freely and let our arms hang freely too, we can observe that the plane of the palms (both of them) are angled inward at ca. 45 degrees. And this is the inclination of the hands should be placed on the grip in order to maintain the neutral position of clavicle bones. Both palms are angled to each other 90 degrees letting to align naturally the lead wrist cocking (radial deviation) with the rear wrist hinging (dorsi flexion). The above scenario is crucial for creating optimal conditions for lag as well as for the trigger finger pressure point to act while approaching the impact zone.
Last but not least, this kind of grip helps vividly to achieve the elbow plane earlier since the flexion of the rear hand happens perpendicularily to the rear forearm practically through the entire motion.
I think that the wrists should be neutral at rest - in the address position - the wrists should be neither cocked or bent, and the forearms should neither be supinated or pronated. Under those conditions, the palms will only be angled 45 degrees inwards because the hands adopt the "anatomical position of rest" when relaxed. The anatomical position of rest involves a slight dorsiflexion of the wrist, which makes the wrist appear to be scooped/cupped. When gripping a club, the degree of left wrist scooping depends on the width of the grip when a club is actually gripped in this neutral position. The right wrist loses its cupped/scooped appearance if the right wrist is kept level on the grip, thereby not allowing the right palm to be at 90 degrees to the left palm. That's the recommended neutral TGM position for the right hand - even if a golfer chooses to adopt a slightly stronger left hand grip.
I know of no causal connection between the wrist/hand position on the grip and the neutral position of the clavicles.
ad.5. I wholeheartedly agree to those experts who claim that today's clubs are manufactured with a too upright lies, especially wedges and short/medium irons. Moreover, the dispersion of the lie angles in a set of irons seems to be too big. The length of the clubs is too big as well. All these issues and, especially, to upright lie angles make it more difficult for a golfer to return to the EP after transition.
I know of on biomechanical/mechanical reason why a golfer should get down to the elbow plane in the downswing. Some golfers prefer to stay on the TSP.
3jack,
You should invite Dariusz to join your forum. We could have an interesting/informative debate discussing his biokinetic theories.
Jeff.
I have added my opinions in bold.
ad.1. Lateral flexion (bending to one side in the sagittal plane) of the spine in the downswing (secondary axis tilt) is dependent on the CoG shift in the pelvis area. Humans are bipedals, thus, the shift is a biomechanical necessity that happens automatically provided the motion is being guided sequentially from the ground up. IMO, the earlier the shift happens (see: post-accident Hogan where the shift happened before his upper part of the main body finished backswing) the better are chances to establish the rear elbow on the rear hip joint which guarantees perpendicularity of the rear forearm to the core.
I know of no biomechanical/mechanical necessity why the rear forearm must be perpendicular to the core.
ad.2. Shoulder rotation inwards happens unintentionally if the backswing is being lead with the rear side of the body. As said before, one of the golden rules I believe in is leading the motion with that body side that corresponds to the direction of the motion.
ad.3. The rear arm role in the downswing taking into account a very limited range of motion in the elbow joint (as you correctly noticed) is twofold in the macroscale - a) the humerus should tie its motion to the main body motion as much as possible, and b) the forearm should support the club as much as possible.
I know of no biomechanical/mechanical reason why it is imperative to tie the right humeral motion to the rotational motion of the core.
ad.4. The soundest from biokinetical point of view is merging the lead wrist deviation and the rear wrist flexion which can be achieved in only one way - merging strongish LH and weakish RH and forgetting not very wise IMO parallel V's theory. The natural position of the wrists when a golfer bends his spine forward - we shall find that neither "anatomical position" (palms are directed forward) nor "gorilla position" (palms are directed backwards) is natural for the wrists. When we stand freely and let our arms hang freely too, we can observe that the plane of the palms (both of them) are angled inward at ca. 45 degrees. And this is the inclination of the hands should be placed on the grip in order to maintain the neutral position of clavicle bones. Both palms are angled to each other 90 degrees letting to align naturally the lead wrist cocking (radial deviation) with the rear wrist hinging (dorsi flexion). The above scenario is crucial for creating optimal conditions for lag as well as for the trigger finger pressure point to act while approaching the impact zone.
Last but not least, this kind of grip helps vividly to achieve the elbow plane earlier since the flexion of the rear hand happens perpendicularily to the rear forearm practically through the entire motion.
I think that the wrists should be neutral at rest - in the address position - the wrists should be neither cocked or bent, and the forearms should neither be supinated or pronated. Under those conditions, the palms will only be angled 45 degrees inwards because the hands adopt the "anatomical position of rest" when relaxed. The anatomical position of rest involves a slight dorsiflexion of the wrist, which makes the wrist appear to be scooped/cupped. When gripping a club, the degree of left wrist scooping depends on the width of the grip when a club is actually gripped in this neutral position. The right wrist loses its cupped/scooped appearance if the right wrist is kept level on the grip, thereby not allowing the right palm to be at 90 degrees to the left palm. That's the recommended neutral TGM position for the right hand - even if a golfer chooses to adopt a slightly stronger left hand grip.
I know of no causal connection between the wrist/hand position on the grip and the neutral position of the clavicles.
ad.5. I wholeheartedly agree to those experts who claim that today's clubs are manufactured with a too upright lies, especially wedges and short/medium irons. Moreover, the dispersion of the lie angles in a set of irons seems to be too big. The length of the clubs is too big as well. All these issues and, especially, to upright lie angles make it more difficult for a golfer to return to the EP after transition.
I know of on biomechanical/mechanical reason why a golfer should get down to the elbow plane in the downswing. Some golfers prefer to stay on the TSP.
3jack,
You should invite Dariusz to join your forum. We could have an interesting/informative debate discussing his biokinetic theories.
Jeff.
