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2012-01-12 3:09 PM
in reply to: #3985509

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Subject: RE: Running on concrete

Wow - very interesting stuff!

Thanks for all the links and explanations.

 



2012-01-12 7:34 PM
in reply to: #3986929

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Subject: RE: Running on concrete
TriRSquared - 2012-01-12 12:50 PM
p>I love how people think anecdotal evidence trumps physics. l

Doesn't physics say bees cannot fly? I saw one fly once. But, by the above mentioned science, I must have been drinking too much that day. My dicey knees let me know when I run on concrete.
2012-01-12 7:47 PM
in reply to: #3987411

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Subject: RE: Running on concrete
Mikeylee - 2012-01-12 9:34 PM

Doesn't physics say bees cannot fly? I saw one fly once. But, by the above mentioned science, I must have been drinking too much that day. My dicey knees let me know when I run on concrete.


Physics most definitely does not say that. For many years we were unable to understand how they flew but the idea that it was thought that honey bee flight was impossible was an ID misrepresentation.

IIRC it has been about five years since we have figured out how bees fly.

Shane
2012-01-12 8:35 PM
in reply to: #3986687

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Subject: RE: Running on concrete
TriRSquared - 2012-01-12 1:28 PM
zia_cyclist - 2012-01-12 2:04 PM
mgalanter - 2012-01-12 8:35 AM

This is one of my favorite urban-running myths.

Yes - concrete is harder than asphalt which in turn is harder than packed dirt. But the difference in amount of deflection and cushioning between these surfaces is NEGLIGIBLE and makes no difference to runners.

In engineering terms, all these surfaces are significantly higher Yield Strength than a human foot (regardless whether its bare of shod in a running shoe). The human foot will deflect (or shoe rubber will compress) until its yield is equal to that for the material you are running on.

Unless you are a 500lb person with size 1 feet who pounds the ground with all his might there will be ZERO physical difference between running on concrete and asphalt and packed dirt.

Any difference felt is purely psychological.

 

*Note: running tracks made of fused rubber pellets, grass, and sand have different Yield Strength  and/or modulus of elasticity - but that's is a different story

Exactly.  No difference.  I use my trusty hammer test.  I take my hammer to the concrete trail and pound it as hard as I can.  Note the vibration and indention in the concrete.  Do the same on asphalt.  No difference.

I note an air of sarcasm.  It is true that asphalt is "softer" than concrete.  However asphalt is so MANY MANY time harder than your shoes, legs, joints, feet etc.. that the asphalt defects more than the concrete, an amount that is almost immeasurable. Therefore all of the deflection has to be on the opposite side of the road (into you).  Therefore, essentially no difference.

I was agreeing with you. Not trying to be sarcastic.  There is no difference running on concrete vs asphalt.

2012-01-13 8:05 AM
in reply to: #3987519

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Subject: RE: Running on concrete
zia_cyclist - 2012-01-12 9:35 PM

I was agreeing with you. Not trying to be sarcastic.  There is no difference running on concrete vs asphalt.

Sorry for the misunderstanding.  I'm glad we agree

2012-01-13 8:09 AM
in reply to: #3987411

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Subject: RE: Running on concrete

Mikeylee - 2012-01-12 8:34 PM
TriRSquared - 2012-01-12 12:50 PM
p>I love how people think anecdotal evidence trumps physics. l
Doesn't physics say bees cannot fly? I saw one fly once. But, by the above mentioned science, I must have been drinking too much that day. My dicey knees let me know when I run on concrete.

That old wives tale was disproved long ago.  It was stared back in the 1930s and has unfortunately persisted despite science to the contrary..

http://www.lifeslittlemysteries.com/1150-how-bees-fly.html

I'd love to see an experiment where you were told to run on a surface but did not know what the surface was (blindfolded etc..).  I would wager large amounts of money that people could not tell the difference.



Edited by TriRSquared 2012-01-13 8:17 AM


2012-01-13 8:50 AM
in reply to: #3985509

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2012-01-13 9:16 AM
in reply to: #3988164

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Subject: RE: Running on concrete

tkos - 2012-01-13 9:50 AM Any injuries will come from improper running mechanics.

Amen. This is the gospel according to tkos.

You could be running in the most cushioned shoes on a track made of Serta Sleeper mattresses but if you are running in such a way that you are planting your foot far enough forward to lock your knee at the pint of impact and you will feel it in the knee joint.

2012-01-13 9:16 AM
in reply to: #3985509

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Subject: RE: Running on concrete
A bee has a harder time landing on concrete than asphalt.....that is not open for argument.
2012-01-13 9:25 AM
in reply to: #3986614

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Subject: RE: Running on concrete
zia_cyclist - 2012-01-12 2:04 PM 

Exactly.  No difference.  I use my trusty hammer test.  I take my hammer to the concrete trail and pound it as hard as I can.  Note the vibration and indention in the concrete.  Do the same on asphalt.  No difference.

To complete this analogy, be sure to strike that hammer just as hard to the bottom of your foot. Report back.

2012-01-13 9:25 AM
in reply to: #3986614

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Subject: RE: Running on concrete
Double Post.

Edited by BernardDogs 2012-01-13 9:25 AM


2012-01-13 9:26 AM
in reply to: #3987519

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Subject: RE: Running on concrete
zia_cyclist - 2012-01-12 9:35 PM 

I was agreeing with you. Not trying to be sarcastic.  There is no difference running on concrete vs asphalt.

Never mind. You don't need to bang your foot with a hammer.

2012-01-13 9:29 AM
in reply to: #3988246

Deep in the Heart of Texas
Subject: RE: Running on concrete

Left Brain - 2012-01-13 9:16 AM A bee has a harder time landing on concrete than asphalt.....that is not open for argument.

Mexican Free-tailed Bats cannot take flight from either surface.

2012-01-13 9:39 AM
in reply to: #3988277

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Subject: RE: Running on concrete
Hook'em - 2012-01-13 9:29 AM

Left Brain - 2012-01-13 9:16 AM A bee has a harder time landing on concrete than asphalt.....that is not open for argument.

Mexican Free-tailed Bats cannot take flight from either surface.

 

Physics hates anything free.

2012-01-13 9:53 AM
in reply to: #3985509

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Subject: RE: Running on concrete

 Physics is the honeybadger of the science world.  On a related note honeybadgers hate concrete, and asphalt, and soft running trails, and bees and free tailed bats....

2012-01-13 10:01 AM
in reply to: #3988303

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Subject: RE: Running on concrete
Left Brain - 2012-01-13 7:39 AM

Physics hates anything free.

Another lie propagated by science haters. The sun has been freeing particles 24/7/365 for years now. Perhaps longer.



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