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nike running Shoes Change Shape As They Wear Out

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nike running Shoes Change Shape As They Wear Out

In one of the few good studies on the subject, Kong, Candelaria, and Smith at the University of Texas at El Paso examined the changes in running mechanics after a group of 24 runners covered 200 miles over the course of their regular training.To buy more [url=]Mens Nike Free 5.0 V4[/url] with cheap price, you can visit shoesshox official website.


The runners were split into three groups, each of which wore a different shoe—an air-cushioned shoe (Nike), a gel-cushioned shoe (ASICS), and a spring-cushioned shoe (Spira). The results highlight a few important findings.


First, at the initial evaluation of running mechanics (before the 200 miles of training), there were no differences between the groups.


This should teach us a thing or two about how shoes can (or rather, can’t) affect running mechanics. But, more to the point, there were only minor changes in running mechanics after the 200 miles of wear on the shoes (none at all in the hip and knee), and no changes in actual forces measured.


Check this out:


Even though we may reasonably predict that the shoes had lost 20% of their cushioning capacity, there was no change in impact forces!


This should come as no surprise to regular readers of this blog, since we’ve seen before that the body adapts to various surfaces by changing leg stiffness. The increased stance time that Kong et al. observed hints that the leg becomes more compliant to adapt to the stiffer, thinner worn shoes.


The other findings of Kong et al. are also in line with adaptations associated with running on harder surfaces, like flatter foot placement.


Additionally, there were no differences in mechanics between wearers of the different shoe types after the 200 miles of training either.