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Post by imperfectgolfer on Dec 25, 2012 12:40:37 GMT -5
See this BM-forum thread. www.brianmanzella.com/golfing-discussions/17931-jim-mcleans-6-degree-freedom-3d-report.htmlBM posted this graph. I personally have little interest in 3-D graphs (especially when they are presented without referential standards and interpretative comments) - but it is amazing to me to see that the clubhead speed drops dramatically prior to impact. What is causing that phenomenon? Also, why is hand speed different to left arm speed? How are those measurements established? Finally, note the sudden blip-increase in hand speed and clubhead speed just before impact in image 2 - is he flipping through impact? How does BM get away with presenting graphs while simultaneously offering no interpretative analysis? He is quintessentially a pseudo-scientist, a great pretender-of-being-a scientist! Lia wrote-: " All these images and lines aren't illuminating.
We used to draw lines on video and then laugh at the impracticality.
Now it seems we just went round a cul de sac, in reality.
Uh ha" He is correct - BM mocks line-drawing on video capture images, but he presents these graphs in an unscientific manner. Even the BM groupies cannot accept this unscientific approach. Lia's final poetic comment is "classic". " Brian thought he taught all of you
because he thought it was logical
in fact it was tautological
rarely factual
increasingly impractical
self referential
a room of mirrors
a house of cards.
Theories must fall.
Karl Popper, for real though...
" Jeff.
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Post by imperfectgolfer on Dec 25, 2012 12:52:30 GMT -5
Natep wrote the following in that BM-forum thread. " Because the shoulder sockets can adduct and abduct independently of each other, this can be an issue if the shoulders are used for the torso measurements. It's a different situation than the hip sockets, which cannot move independent of one another." That's crazy! The shoulder sockets cannot abduct/adduct. The upper arm/humerus can adduct/abduct within the shoulder socket, but that has nothing to do with measurements of torso rotation. If the hip sockets cannot move independently of each other, then how can Phil Mickelson pull his lead hip joint back towards the tush line faster than he pulls his rear hip joint away from the tush line between P4 and P5 (see images 1 and 2 in the next photo-sequence)? Jeff.
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Post by nate on Dec 25, 2012 19:29:49 GMT -5
That's crazy! The shoulder sockets cannot abduct/adduct. You might wanna go back to school there, doc.
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Post by imperfectgolfer on Dec 26, 2012 0:26:11 GMT -5
Nate,
I don't think that I need to go back to school. However, I suspect that you need to review shoulder socket motions, which are really secondary to scapula motions. The shoulder sockets can move about secondary to scapular protraction and retraction, upward/downward rotation of the scapula, and elevation/depression of the scapula. During arm abduction/adduction there may be secondary motion of the shoulder sockets (as described).
Jeff.
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Post by tapiosantala on Dec 26, 2012 5:15:00 GMT -5
As I told in Richie's, those graphs are made by fault measurement or/and terrible filtering and got nothing to do with the truth or credibility.
Everyone who has been working even a bit with those can see it in one second and understand that someone who publishes those got about zero understanding about what he is talking about.
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