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Old 01-21-2013, 10:52 PM   #127
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
Posts: 3,136
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MYTH: Pronation produces significant racket head speed on the serve.
http://www.youtube.com/watch?v=Y1C6V_3s4nA

This dated video is not correct and is misleading. It should be replaced to reflect the current biomechanical analysis of the serve. (I'm a big fan of FYB.)

REALITY: Internal shoulder (upper arm rotation) produces the greatest contribution to racket head speed on the serve as described by Bruce Elliott & associates for the last 2 decades.

Biomechanics and Tennis
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2577481/

Video showing ISR.
http://vimeo.com/27528701

The confusion comes about because both ISR with a straight arm and pronation result in the exact same rotation at the wrist. However, ISR is powerfully driven by large muscles (lat & pec) but pronation is driven by much smaller forearm muscles.

Last edited by Chas Tennis : 01-22-2013 at 09:59 AM.
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