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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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Makes perfect sense to me.....=P

I have been saying this for years.    :)


I'd like to see the seven segment throwing model in action,needs video;>}
My brain hurts. They used too big of words.

This is why I bet in everyday life people hated Einstein.  They'd be playing croquet or something and he'd go off on a tangent like this and after about two minutes you're like, "shut up already, jerk". 


I'll take lessons from the "this is a golf club" guy on Youtube anyday.

"Shut up and Throw" right Norbert
Finally, someone said it!
Ignore everything but "the largest power contribution results from ... the shoulder providing nearly all the work".

Exactly.  No need for awkward body movements getting in the way of raw shoulder power!

i bet if that robot got a boss and started using the x step, he could use more than 57% max effort
So long as it still allows for comfortable motion of the glenohumeral rhythm and scapular

sliding on the thorax.  That is key.

Reading that made my radioulnar hurt and now my thorax itches.

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