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Backhand Disc Throw


4.1 Abstract


The flight of the disc is understood but how a person produces the initial conditions


remains to be investigated. A seven segment throwing model has been developed to


investigate the kinematics and kinetics of backhand disc throws. This model specifies


the motion of the torso, allows for the motion of the glenohumeral rhythm and scapular


sliding on the thorax, and includes six degrees of freedom: three at the shoulder, and one


each at the elbow (ulnahumeral), radioulnar, and wrist (radiocarpal) joints. The equations


of motion, developed symbolically using Kane’s method, were coded in AUTOLEV.


Analysis of 57% maximal effort throws reveals that the largest power contribution results


from horizontal adduction of the shoulder providing nearly all the work done to increase


translational velocity of the disc. At release the work done by horizontal adduction


was 35 J while the total work at all joints was 34 J. The seven segments behaved as a


kinetic chain during the throw; however the elbow does not fully extend at any time. It


was flexed 57° at release, coming no closer than 27° to full extension during follow


through.


4

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I have to start all over, dangit! I guess the person who wrote this knows best.
Don't let your  "Mind " get in the way of " Your throw ".
As long as I play in the morning, that works for me.  Evenings, my meds have worn off and the ADHD switch is flipped on.  I could write an even more long-winded essay about the effects of ADHD on a RHBH throw than the original post in this thread.  I'd have to do it in the A.M. for it to be comprehendable.

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