Explaining how shoe design might help break two Nike Dunk High Dam hours was tricky, says Kram, Nike Air Max 95 Dámské because while they had already completed testing on the new shoe, they couldn’t include their non-peer-reviewed data in a peer-reviewed journal. So they focused on the weight of the foam midsole, which, based on previous studies, they estimated could improve Nike Air Zoom Spiridon Womens an athlete’s running economy by around one Nike Air Max 95 Dámské percent.“The world record at that time [2:02:57 by Kenyan Dennis Kimetto in 2014] was in the Adidas Boost shoe,” says Hoogkamer, now a professor at the University of Massachusetts Amherst. However, he adds, “we didn’t say you can Nike Air Max 95 Dam make the foam Nike Air Max 270 Damen better; we said, ‘Boost is pretty heavy, so maybe you can make it Nike Air Max 97 Femme lighter.’”As for the Vaporfly testing itself, Kram and Hoogkamer approached it with one simple question: Was it faster?

In May of the following year, Nike provided a teaser of an answer with Breaking2, Adidas NMD Damwhere Eliud Kipchoge of Kenya Nike Air Force 1 Dámské came within 25 seconds of the two-hour mark on the Formula One Autodromo Nationale track in Monza, Italy. Even unsuccessful, it was a striking improvement over Kimetto’s record, and running fans debated what was responsible for the two percent time drop—Nike Air Max Classic BW Femme --the dead-flat track, the pacers, the massive car-mounted Nike Air Max 95 Womens clock that also functioned as a draft vehicle, or the prototype shoe Kipchoge wore.Nike didn’t tell Rodger Kram and Wouter Hoogkamer much about the prototype shoe at first. “We knew it had a new foam, called Pebax, Nike Air Max 270 Dam and they showed us Nike Air Max 97 Mujer the carbon [fiber] plate,” recalls Kram.

The exercise physiologist and longtime director of the University of Colorado Boulder’s Locomotion Lab, and Hoogkamer, then a post-doctoral researcher there, were writing a journal paper, published in March 2017, detailing Nike Dunk High Mujer> how an elite runner might break the Nike Air Vapormax Damen mythical two-hour marathon barrier. One factor they detailed was shoe design, and the two had been given what would become the ZoomX Vaporfly 4% to test.As shoemakers continue to try to improve performance, and research accumulates showing Nike Air Vapormax Dam a modest www.jiridolezel.cz but undeniable benefit to next-generation materials, the Nike Air Presto Dam foam wars have only gotten more heated.For now, the elastic properties of the Nike Prototype shoes provide the best explanation for the metabolic energy savings.”