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Originally Posted by lagster
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OK... it sounds to me like Mr. Yoda is saying that technically any actual RADIO-ULNAR activity(supination/pronation) of the left arm, whether conscious or automatic, is actually termed SWIVEL ACTION.
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Lagster,
I am no biomechanic, but I really don't think that is the case.
The Horizontal Hinge Action is actually the natural product of the Body Rotation and the Arm Swing. To the extent the Left Wrist remains Vertical to the ground, i.e., the horizontal plane, then we have a Hinge Action, not a Swivel Action.
And the natural Arm Swing will -- I think
-- produce the muscular activity you have described.