Your first instinct might be to rush out and buy a pair – especially as a separate study in the journal Sports Medicine on elite athletes estimated that the shoes could take six minutes off a three-hour Nike Air Max 2017 Femme marathoner’s time. Good luck with that. The shoes appear to be almost permanently sold out, and often go for double their retail price on eBay.A more pressing task is to ask whether the shoes – and other forms of cutting-edge technology – go too far. Do they, in effect, turn what is supposed to be a level playing field in one that more resembles the Nike Air Presto Mujer slope of the Eiger?A case can be made that the Vaporflys have already created at least one major sliding-doors moment in elite sport. Roger Pielke Jnr, the director of the sports governance centre at the University of Colorado Boulder, notes that in the 2016 US Olympic marathon Nike Air Max 2017 Mujertrials, Kara Goucher finished in fourth – missing out on the plane to Rio by just one place. Yet the winner, Amy Cragg, along with the third-placed runner, Shalane Flanagan, were both wearing early prototypes of the Vaporflys, which he believes could have made all the difference to the result.
“It is highly likely that Goucher is the first known athlete to miss the Olympics due to shoe technology,” says Pielke. “The mean improvement of Nike Vaporfly for women and fastest runners is Nike Internationalist Mujer around 2%. Put Goucher into Vaporflys in the 2016 US marathon trials, and she Nike Air Pegasus 89 Damen gets a spot if they improve her performance by only 0.7%.”The kicker? If Goucher had not left the Nike Oregon Project after raising concerns about its use of TUEs and thyroid medication,Adidas ZX Flux Mujer she may indeed have been wearing those shoes.o you know the most remarkable thing about Nike’s ￡200 Vaporfly Elite trainers? They actually live up to the hype. When the shoe was launched last year, Nike insisted it improved running economy by an average of 4% – a claim so astounding Adidas ZX 750 Mujer that it caused many sports scientists’ eyebrows to rise in scepticism, loosely aping the company’s swoosh Nike Air Vapormax Damen logo.We knew we needed to find a way to keep our journalism open and accessible to everyone, regardless of where they http://www.daviddenardi.fr live or what they can afford.
However last week, the New York Times, having analysed 495,000 marathon and half-marathon times since 2014 using data from Strava, reached a similar conclusion. Runners who wore Vaporflys, which have a controversial carbon-fibre plate in their soles, did indeed run 3-4% quicker on average than similar runners wearing other shoes, and around 1% faster than those using the next speediest shoe.So where should we draw the line? On the one hand you cannot blame companies for striving to break new ground. They have profits to chase, consumers to satisfy, competitors breathing down their neck. We want these products, too. Only the most Adidas NMD Mujer masochistic of runners attempts marathons in bare feet or old?school trainers.The International Association of Athletics Federations, the world governing body, also insists that Nike’s game-changing shoe meets all its requirements and “does not Adidas NMD Femme require any special inspection or approval”. Yet elite competition also requires a semblance of fairness. At some point the IAAF will have to rule on the permissible amount of energy return allowed from cushioning materials and whether carbon?fibre devices in midsoles should be banned.
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