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Van Den Bogert, Ton
09-04-2008, 05:48 AM
That work is basically a statistical analysis (curve fitting and
extrapolation) providing little additional insight into Bolt's
exceptional performance.

Interesting about Bolt is that he is so much taller than most other
sprinters. Others with similar body type have not been as successful,
so he must have something else that is advantageous. Either in his
anatomy or his muscle properties.

One of the commentators on NBC suggested that he may have larger muscle
moment arms, and this was also mentioned by Bengt Saltin to a New York
Times reporter:
http://www.nytimes.com/2008/08/20/sports/olympics/20bodies.html. There
was no mention of any MRI data to support this idea, though.

Theoretically, I would expect that a smaller (not larger) muscle moment
arm would be advantageous (except at the start) because it allows
muscles to operate at lower speed during the sprint. In the later parts
of the race, where Bolt does especially well, high joint angular
velocity is more important than high joint moment. With long legs and
small muscle moment arm, it is like having a higher gear on the bicycle.

Ton van den Bogert

--

A.J. (Ton) van den Bogert, PhD
Department of Biomedical Engineering
Cleveland Clinic Foundation
http://www.lerner.ccf.org/bme/bogert/


> -----Original Message-----
> From: * Biomechanics and Movement Science listserver
> [mailto:BIOMCH-L@NIC.SURFNET.NL] On Behalf Of Rodger Kram
> Sent: Wednesday, September 03, 2008 6:18 PM
> To: BIOMCH-L@NIC.SURFNET.NL
> Subject: [BIOMCH-L] Bolt
>
> Things have been pretty subdued here on Biomch-L.
> This "article" projecting how fast Usain Bolt "could have
> run" should provoke a little discussion.
>
> http://arxiv.org/PS_cache/arxiv/pdf/0809/0809.0209v2.pdf
>
> if nothing else, read the acknowledgements section.
>
> Rodger
> --
>
>
> Rodger Kram, Ph.D.
> Associate Professor
> Dept. of Integrative Physiology
> Univ. of Colorado
> 354 UCB
> Boulder, CO 80309-0354
>
> office: 103 Clare Small
> phone: (303) 492-7984
> fax: (303) 492-4009
>
> e-mail rodger.kram@colorado.edu
> WWW: http://spot.colorado.edu/~kram/
>
> ---------------------------------------------------------------
> Information about BIOMCH-L: http://www.Biomch-L.org
> Archives: http://listserv.surfnet.nl/archives/Biomch-L.html
> ---------------------------------------------------------------
>
>


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