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s that return more energy than th
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In an announcement earlier this year, the group said, “It www.alankerrleisure.co.uk/Nike-Air-Max-90-Womens-c-22_24.html is clear that some forms of technology would provide an athlete with assistance that runs contrary to the values of the sport.” It has since appointed a technical www.alankerrleisure.co.uk/Nike-Air-Pegasus-83-Womens-c-52_54.html committee to study the shoe question, and to make a report with recommendations. (The report was originally intended to be www.carlosvisuara.es/Nike-Blazer-Low-Mujer-c-52_54.html released to the public by the end of the year; it will now reportedly www.aralys.fr/Nike-Air-Vapormax-Femme-c-62_63.html be released in 2020.)When we asked Nike last year about whether its shoes might violate I.A.A.F. rules, a spokesman said the shoe “meets all I.A.A.F. www.jonhaylett.co.uk/Nike-Air-Max-90-Womens-Pink-c-13_17.html product requirements and does not require any special inspection or approval.”On Thursday, the company said in a statement, “We respect the I.A.A.F. and the spirit of their www.annieemmerson.co.uk rules, and we do not create any www.anamartinez.es/Nike-Air-Presto-Mujer-c-76_78.html running shoes that return more energy than the runner expends.” There is no such thing as a large-scale randomized control trial for marathons www.carlosvisuara.es/Adidas-NMD-Mujer-c-67_69.html and shoes, but there is Strava, a fitness app that calls itself the social network for athletes. Nearly each weekend, thousands of runners compete in races, www.dancardwell.co.uk/Nike-Air-Odyssey-Womens-Mens-c-36_37.html record their performance data on satellite watches or smartphones, and upload their race data to the app. This data www.aazmotos.fr/Nike-Air-Span-2-Femme-c-25_26.html includes things like a race name, finish time, per-mile splits and overall www.carlosvisuara.es/Adidas-ZX-Flux-Mujer-c-82_84.html elevation profile. And about one in four races includes self-reported information about a runner’s shoes.In all, this data includes race results from www.aralys.fr/Nike-Air-Max-90-Homme-c-19_27.html about 577,000 marathons and 496,000 half marathons in dozens of countries from April 2014 to December 2019.These approaches are essentially identical to the ones The Times www.beverleyely.com/Nike-Air-Max-Classic-BW-Womens-c-31_32.html used last summer. See that article for more www.emilytorino.it/Nike-Air-Max-95-Donne-c-46_47.html examples and methodological details. We measured the shoes’ performance using four different methods — each with its own strengths and www.romanvavrik.cz/Nike-Air-Vapormax-D&225;msk&233;-c-55_56.html flaws:None of these approaches are perfect, but they all point to the same conclusion: Something is happening in races with the Vaporfly and Nike Next% shoes www.prestamatic.fr/Nike-Air-Max-2017-Femme-c-13_14.html that is not happening with most any other kind of popular shoe.More than 110,000 athletes uploaded data for www.raheembakare.co.uk/Nike-Air-Max-Thea-Womens-c-43_45.html more than one marathon, and about 47,000 uploaded data for three or more marathons. The www.jonhaylett.co.uk/Nike-Air-Presto-Womens-c-33_35.html Strava data allows us to follow these repeat racers over time and as they change shoes.
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