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These findings are based on more than twice the data that produced our previous estimates. Our data now includes results from more than a million marathons and half marathons combined since 2014.More important, nearly all of these new results take place in a Adidas ZX 850 Mujer world in which runners Nike Internationalist Damenhad begun to wear these shoes in large numbers. In this period, an overwhelming share of runners — particularly faster ones — reported switching to these shoes, presumably looking for any edge they could get on race day.Consider that in the final months of 2019Nike Air Max 90 Mujer Rosa , about 4Nike Air Max 90 Essential Damen 1 percent of marathons under Adidas Superstar Donne three hours were reported to have been run in these shoes (for races in which we have data):

What makes these shoes different is, among other things, a carbon-fiber plate in the midsole, which stores and releases energy with each stride and Nike Air Max 90 Womens is meant to Nike Air Max 720 Damen act as a kind of slingshot, or catapult, to propel runners. The shoes also feature midsole foam that researchers say contributes to increased running economy.Whether the shoes violate rules from track’s governing body, World Athletics, depends on how one interprets Nike Air Max 90 Femme this sentence from its rulebook: Adidas NMD Womens “Shoes must not be constructed so as to give athletes any unfair assistance or advantage.” It does not specify what such an advantage might be.

“We need evidence to say that something is wrong with a shoe,” a spokesman for the governing body, then called Adidas NMD WomensNike Air Vapormax Womens the I.A.A.F., told The Times last year. “We’ve never had anyone to bring some evidence to convince us.”What makes these shoes different is, among other things, a carbon-fiber plate in the midsole, which stores and releases energy with each stride and is meant to act as a kind www.aralys.fr of slingshot, Nike Air Vapormax Damen or catapult, to propel runners. The shoes also feature midsole foam that researchers say contributes to increased running economy.Whether the shoes violate rules from track’s governing body, World Athletics, depends on how one interprets this sentence from its Nike Air Max 95 Womens rulebook: “Shoes Nike Air Max 270 Femme must not be constructed Nike Air Max 97 Damen so as to give athletes any unfair assistance or advantage.” It does not specify what such an advantage might be.“We need evidence to say that something is wrong with a shoe,” a spokesman for the governing body, then called the I.A.A.F., told The Nike M2k Tekno Femme Times Adidas ZX 750 Womens last year. “