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Scapular (definition): Of or pertaining to the shoulder blade. Source: Taber's Cyclopedic Medical Dictionary.
Loading [in the engineering sense (abbreviated definition)]: Any forces ("dead load": unmoving or unvarying or "live load": moving or temporary) a structure is calculated to oppose. Source: Dictionary.com.
As a descriptive term, "Scapular loading", as it is employed in reference to pitching a baseball (though the essential functioning and effect of "Scapular loading" applies to throwing of just about anything: a softball, a football, a rock etc.) is something of a misnomer.
While it is likely that some "loading" effect is experienced by the Scapulae during the action of pitching a baseball, it is the "loading" (mostly by means of compression/contraction) of the muscles surrounding, attached to and controlling the Scapulae in which we are interested relative to so-called "Scapular loading" with regard to the production, storage and subsequent transfer of accelerating force ultimately to be applied to the surface of the baseball at the fingertips of the fingers of the pitching/throwing-hand.
The Scapulae, however, perform the indispensable role of providing a solid, stabilizing structure and surface against which compression of the associated musculature can be and is accomplished and from which "follow-through" of the upper body and pitching-arm to the release-point of the baseball from the hand of the pitcher in correct execution of Finalized Outman Methodology is initiated, is "launched" because the muscles opposing those being "loaded" through compression/contraction also experience "loading", but by reason of being stretched before being explosively contracted.
While the term "Scapular loading" is something of a misnomer, as a matter of expediency (and brevity), it is a label far more convenient and preferable to employ than being required to iterate the phrase "loading, primarily by means of compression of the muscles surrounding, attached to and controlling the Scapulae to produce, store and, then, to transfer accelerating force."
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