They're fast. Too fast? Scientific studies suggest that Nike’s high-tech Vaporfly running shoes, equipped with super-springy foam soles encasing a carbon-fiber plate, can increase running efficiency by between 4% and 6%
LONDON - Athletics’ ruling body will tighten regulations governing shoe technology, two sources familiar with the matter said, after Nike’s popular Vaporfly brand helped re-write running records and sparked debate about whether it was “technological doping.”
“World Athletics definitely agrees that there needs to be greater clarity on what is permissible in elite sport and in our competitions,” it said in a statement to Reuters, adding that any change would need to be ratified by its council. The governing body, which has longstanding restrictions on midsole thickness for high jump and long jump shoes but has given free rein to running shoes, says more research is needed to determine exactly what benefits are provided by the Vaporfly.
He said if World Athletics did nothing to halt such advances, “the consequence is going to be a race between the manufacturers rather than a race between the athletes.” Strava, the global social network for athletes, said in its 2019 review that the median marathon finish time for runners in the Vaporfly model Next% was 8.7% faster than runners wearing the next fastest shoe, the Adidas Boston.Sports scientists writing in the British Medical Journal said the Vaporfly deviates from conventional running shoes in three ways: it has embedded carbon-fiber plates, its midsole is made of super-condensed foam and its midsole is particularly thick.
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