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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



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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.
I heart physics!

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