Posted by: tom.guerry (tom.guerry@kp.org) on Wed Jan 7 13:47:47 2009

Al-

Good stuff !

http://www.batspeed.com/messageboard/192040.html

Another important factor is how the torso is loaded to drive the "transfer"/compound pendulum.

I think Cheetham's work is important here in terms of "x-factor STRETCH in the downswing" which is a refinement of the xfcator concept AND his "kinematic" (just measuring angular velocity/sequence of segments, not addressing the forces/kinetics that produce the summation of velocity).

Another important motionanalysis measure is the efficiency of "speed gains" from one segment to the next.


This post has a brief summary of average Cheetham measures for his MLB hitter database:

http://www.batspeed.com/messageboard/10685.html

and more on efficiency of "speed gains"

http://www.batspeed.com/messageboard/10571.html

difference in separation/position for in vs out:

http://www.batspeed.com/messageboard/10533.html

original x-factor stretch article summary:

http://www.advancedmotionmeasurement.com/Articles/StretchingtheXFactor-Paperwithupdatedinfo2008.pdf

More recent kinenatic sequence comparison of skilled vs less skilled golf swing(Cheetham concentrating on golf now, see for example titleist research institute

http://www.advancedmotionmeasurement.com/Articles/KinematicSequence-
TransitionandDownswing.pdf