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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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Permalink Reply by All day Corey on June 21, 2011 at 2:49pm
Permalink Reply by Destraayer on June 21, 2011 at 3:04pm
Permalink Reply by Joshua Knutson on June 21, 2011 at 3:10pm
Permalink Reply by Joshua Knutson on June 21, 2011 at 5:37pm
Permalink Reply by Dookville on June 21, 2011 at 5:40pm 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.
Permalink Reply by Joshua Knutson on June 21, 2011 at 5:47pm
Permalink Reply by Donny Olow on June 21, 2011 at 5:54pm
Permalink Reply by Jim Coonradt on June 21, 2011 at 10:43pm
Permalink Reply by Jeff Nichols on June 22, 2011 at 12:18am Welcome to
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