[star61]

star61 on May 23, 2010 at 4:42 am #16748

While looking over a few articles on stiffness and vertical displacement, I came across this thesis…

https://contentdm.lib.byu.edu/ETD/image/etd751.pdf

One of the things he seems to be saying (page 7 paragraph 1 and page 8 paragraph 2) is that sprinters display less extension at toe off than slower baseball players. If true, does this contradict all the ‘always get full triple extension’ instruction? And if true, it would explain a question I have always had about reductions in GCT being a good thing. If sprinters recover earlier in the stride then I would be able to see that reducing GCT would actually have a positive impact on speed rather than being simply an artifact, and limiting factor, of higher speeds.

[JeremyRichmond]

JeremyRichmond on May 23, 2010 at 8:27 pm #98387

While looking over a few articles on stiffness and vertical displacement, I came across this thesis…

https://contentdm.lib.byu.edu/ETD/image/etd751.pdf

One of the things he seems to be saying (page 7 paragraph 1 and page 8 paragraph 2) is that sprinters display less extension at toe off than slower baseball players. If true, does this contradict all the ‘always get full triple extension’ instruction? And if true, it would explain a question I have always had about reductions in GCT being a good thing. If sprinters recover earlier in the stride then I would be able to see that reducing GCT would actually have a positive impact on speed rather than being simply an artifact, and limiting factor, of higher speeds.

I’ve attached a biomechanical analysis of Gay and Powell. Its got some interesting notes on knee angles and discusses a difference between this modern technique and those of Carl Lewis’ era. Hmmm…too big to attach 🙁
“Mid-phase sprinting movements of Tyson Gay and Asafa Powell in the 100-m race during the 2007 IAAF World Championships in Athletics” Akira Ito, Koji Fukuda and Kota Kijima

Happy googling

[Chad Williams]

Chad Williams on May 25, 2010 at 5:27 am #98440

While looking over a few articles on stiffness and vertical displacement, I came across this thesis…

https://contentdm.lib.byu.edu/ETD/image/etd751.pdf

One of the things he seems to be saying (page 7 paragraph 1 and page 8 paragraph 2) is that sprinters display less extension at toe off than slower baseball players. If true, does this contradict all the ‘always get full triple extension’ instruction? And if true, it would explain a question I have always had about reductions in GCT being a good thing. If sprinters recover earlier in the stride then I would be able to see that reducing GCT would actually have a positive impact on speed rather than being simply an artifact, and limiting factor, of higher speeds.

Ralph Mann has lots of information on this. Basically, the additonal force you gain from the full extension is not worth the time it takes to do it. By eliminating that last portion of the stride, you are able to gain more strides over the course of the race which yields more total force output.

[star61]

star61 on May 25, 2010 at 8:38 am #98455

I’ve attached a biomechanical analysis of Gay and Powell. Its got some interesting notes on knee angles and discusses a difference between this modern technique and those of Carl Lewis’ era. Hmmm…too big to attach 🙁
“Mid-phase sprinting movements of Tyson Gay and Asafa Powell in the 100-m race during the 2007 IAAF World Championships in Athletics” Akira Ito, Koji Fukuda and Kota Kijima

Happy googling

Wow, very interesting. Contradicts much of what I considered basic sprinting mechanics. So if the implications of this study are accurate, what does that say about many of the commonly used drills? Also, the author states the sprinting mechanics has entered a new era. Does this mean that in the past, sprinters DID contact directly under the body and now the faster sprinters are actully overstriding? Also, no triple extension, and actually the opposite during the power phase. What drills do you do to adapt to this?