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Of the 92 photos Greenberg took, 138 runners have both shoes and bibs visible. Of those, 21 are wearing a [url=http://www.asdthanit.it/Nike-Air-Max-90-Donne-Rosa-c-39.html]Nike Air Max 90 Donne Rosa[/url] version of the Nike Zoom Vaporfly—either the $250 4% or the $150 Zoom Fly—and 117 are not.1 We looked up the data for each of these 138 runners, and, interestingly, the Vaporfly runners finished much better. Of that [url=http://www.anthonytouma.fr/Asics-Gel-Lyte-3-Homme-c-33_39.html]Asics Gel Lyte 3 Homme[/url] group, seven, or 33 percent, ran negative splits. Of the others, 17, or only 15 percent, ran negative splits. The average Vaporfly runner ran the second half of the marathon a minute and forty seconds slower than the [url=http://www.asdthanit.it/Adidas-ZX-Flux-Donne-c-22.html]Adidas ZX Flux Donne[/url] first. But the average non-Vaporfly runner ran the second half five and a half minutes slower. Both groups of runners had faded, but the people in the new shoes had faded less.

These results couldn't remotely be published in a [url=http://www.fizelson.fr/Nike-Air-Max-90-Femme-c-33.html]Nike Air Max 90 Femme[/url] scientific paper. The sample size is too small, and the standard deviations are much too high. There also could be alternate explanations. It's possible that runners who pay exorbitant [url=http://www.jwrennie.co.uk/nike-air-max-1-c-4/nike-air-max-1-womens-c-4_6/]Nike Air Max 1 Womens[/url] prices for awkwardly shaped shoes are the kind of people who plan their races well. The shoes might, for some reason, work particularly well on wet roads or in humid weather or on a course with punishing descents [url=http://www.royerimprimeur.fr/Nike-Air-Max-Command-Femme-c-44_45.html]Nike Air Max Command Femme[/url] down a series of bridges. There could be a placebo effect. Still, the numbers are suggestive: Nike may in fact have designed something that limits the agony of a marathon's final 10K. Certainly, the theory behind the [url=http://www.jwrennie.co.uk/nike-air-max-2017-c-16/nike-air-max-2017-womens-c-16_18/]Nike Air Max 2017 Womens[/url] shoes makes more sense for a race through the five boroughs than the last time there was a boom in marathon technology: when, about eight years, ago everyone started running barefoot to be more like the Tarahumara.Did the [url=http://www.fizelson.fr/Nike-Air-Max-2017-Femme-c-64.html]Nike Air Max 2017 Femme[/url] new shoes help me? It's impossible to know. I ran negative splits, and I closed faster than expected. It wasn't my quickest marathon, but I did do better than last year, which is good for [url=http://www.amaryllis.es/Nike-Air-Max-Zero-Mujer-c-1_14.html]Nike Air Max Zero Mujer[/url] someone getting definitely older and generally slower. All in all, I improved by about 2 percent. I'll wear the shoes again, and I suspect that next year, at the base of the Verrazano Bridge, the foam, and maybe [url=http://www.fizelson.fr/Nike-Air-Max-Command-Femme-c-44.html]Nike Air Max Command Femme[/url] versions of the spoon-like plate, will be in all sorts of elite racing shoes.

Still, one can never really know how much any one factor matters. There are too many things going on. When I got home from the race, I [url=http://www.jwrennie.co.uk/nike-air-max-90-c-19/nike-air-max-90-mens-navy-c-19_25/]Nike Air Max 90 Mens Navy[/url] took off my snazzy sneakers and noticed something strange: a little red plastic disc from one of my kids' board games had somehow gotten wedged into the side of one of them. I hadn't noticed it while running or while putting [url=http://www.royerimprimeur.fr/Nike-Air-Odyssey-Femme-c-32_33.html]Nike Air Odyssey Femme[/url] the shoes on. But it probably added a few extra grams that a team of Nike engineers had spent weeks trying to remove. Maybe it slowed me; maybe by countering some unknown muscular imbalance it sped me up. I'll have to take it out and figure out, next year, if I can drop the remaining 2 percent.