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Post by imperfectgolfer on Jul 12, 2012 0:00:01 GMT -5
See this BM forum thread. www.brianmanzella.com/golfing-discussions/17450-wrist-motion-arm-rotation-left-wrist.htmlHere is the BM-experiment. "You can do a very similar experiment this way: Normal Grip, Left arm level to the ground, full wrist cock, club 90° to the right, back of the left hand facing UP and FLAT. Rotate arm 180° to the left so club is level to the ground. Look at your left wrist!" What do you see with respect to the left wrist when you follow BM's instructions, and why does it occur? Then, repeat the BM-experiment without a club gripped in your hand, but with your fingers extended-out. Do you see the same phenomenon with respect to the left wrist? If not, why not? Jeff.
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Post by virtuoso on Jul 12, 2012 11:39:43 GMT -5
I guess the left wrist "cups" because of the weight of the club.
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Post by imperfectgolfer on Jul 12, 2012 18:52:12 GMT -5
The weight of the club is one factor that will cause the left wrist to dorsiflex.
However, why does it also dorsiflex (cup) in Brendan's example - see original post. Also, note Brendan's latest comment.
Brendan wrote-: "OK my example works with the arm held out and the wrist held 'natural' / unmanipulated but with fingers touching palm - I'd say you will have 10-20 degrees of bend in the wrist.
If you hold it out extended and flat and rotate the arm, you might even get a little bow as you turn the arm.
With the hand a fist, or at least approx the amount of hand clench you do to hold a club, you get extra bend as you rotate.
Interesting."
Why does Brenadan get that "extra bend" (I presume that he is talking about left wrist dorsiflexion)?
Jeff.
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Post by virtuoso on Jul 13, 2012 13:01:21 GMT -5
If I had to guess, the muscle in the forerarm that dorsi-flexes the back of the wrist experiences more tension when you twist your forearm upside down.
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Post by imperfectgolfer on Jul 13, 2012 18:16:58 GMT -5
Here is a photo of me holding the club straight-in-line with my left shoulder socket and left arm - note that I have slightly dorsiflexed left wrist and that is a GFLW. Here is BM showing his neutral grip. Note that he has a an AFLW and not a GFLW, and that his left wrist is palmar flexed. Note that the clubshaft is not straight-in-line with his left arm. This situation happens easily when one holds the club horizontally, and it is due to two influences - i) weight of the club and ii) left forearm pronation which allows the flexor digitorum muscles to be more actively shorter-in-length when the fingers actively clasp the grip, and that active finger flexing action also simultaneously palmar flexes the left wrist. If one then rotates the left arm/club 180 degrees until the club is horizontal on the left side of the left arm, that requires maximum left forearm supination. At that position of maximum left forearm supination, the flexor digitorum muscles become more stretched and they cannot easily palmar flex the left wrist and keep it anatomically flat - especially when the weight of the club is acting in a contrary direction due to the effect of gravity. To have an AFLW in that position, one would have to more actively contract the flexor digitorum muscles so that their more active finger flexing action can also palmar flex the left wrist and avoid left wrist dorsiflexion. In Brendan's example, where he fully uncocks (fully ulnar deviates) the left wrist, he is stretching the flexor digitorum muscles/tendons and decreasing their finger flexing, and therefore palmar flexing, capacity. By contrast, if one maximally radially-deviates the left wrist and also fully flexes the fingers into one's palm, then one can more easily supinate the left forearm fully and still maintain an AFLW after rotating (maximally supinating) the left forearm counterclockwise. Jeff.
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Post by virtuoso on Jul 13, 2012 18:28:25 GMT -5
Ah ha, very interesting.
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Post by imperfectgolfer on Jul 16, 2012 6:55:16 GMT -5
I noted that Drew made the following comment in the BM-forum thread regarding BM's statement.
"Kind of brilliant. Tells you about all you need to know about how the wrist and arm should work."
What does it tell you about how the left wrist and left arm should work?
Drew obviously believes that the left wrist should bend after impact and he believes that the "left wrist bending" phenomenon is integral to the "release" phenomenon. However, not all the BM groupies blindly accept that belief without manifesting an iota of doubt - considering the fact that Wulsy subsequently stated -: "The release is of course more than just the bending of the left wrist. But as far as I know Bmanz has never defined what this bend contributes to the release."
Jeff.
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Post by virtuoso on Jul 16, 2012 10:16:38 GMT -5
Well, Wulsy is a bit of a skeptic.
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Post by imperfectgolfer on Jul 16, 2012 13:16:06 GMT -5
Wulsy's skepticism is a healthy personality trait to have when visiting BM's forum, and it can hopefully inoculate a visitor from too easily accepting "some BM claim" that has very little "evidentiary" support.
Jeff.
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