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Backhand Disc Throw
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
So the guy stayed loose at the joints and used a bent elbow technique while turning his hips and upper body while having his shoulder keep everything on line and chopped at the end so he wouldn't hyper extend his elbow. Sounds like what we already know, good stuff. Muwahahahahaha, a nice flat easy shot.