Post by dubiousgolfer on Aug 17, 2017 12:36:11 GMT -5
I was looking at this you tube video (at 1:23) and noticed a movement that I'd never realised could theoretically happen in the golf swing. That the whole arm can rotate without the 'hand/clubface ' rotating.
Wondering how 3D AMM sensor systems can identify this type of movement in the golf swing (if its actually occurring in a golf swing). Further, when I look at this MY SWING calibration video , I cannot see any sensor in the upper arm that suggests that they can distinguish between 'whole arm' and 'just forearm' pronation/supination. Seems to cast even more doubt on the integrity of their graphs.
Post by imperfectgolfer on Aug 17, 2017 16:35:28 GMT -5
That unusual counterclockwise rotating of the left humerus only happens because he is preventing his hands from rotating by holding his hands/club in a "fixed" position using the right hand that prevents rotation of the left hand. In some people, who are are ultra-flexible, and who can independently rotate the left humeral head in the left shoulder joint, it is possible to cause the humerus and upper forearm to rotate in that strange manner because the lower forearm is prevented from rotating - as just described. That type of rotary motion of the left elbow never happens during the downswing in any full golf swing that I have ever examined. Tom Betrand wrote a book calling that unusual type of left elbow motion motion one of Hogan's secrets. I have personally never seen that type of external rotation of the left humerus (and therefore elbow joint) happening during the downswing in any of Hogan's swing videos or in any other pro golfer's downswing.
The MySwingGolf system does place a sensor on the lateral side of the left upper arm and another sensor on the lateral side of the left lower forearm, so it can theoretically differentiate between external rotation of the left upper arm and supination of the left forearm - although Peter Gauthier told me that his system is not accurately differentiating between the two rotary motions in "real life" practice.