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ughly half a million marathon times from public data
Why does;msk&233;-c-62_63.html energy return matter? Iain Hunter, Ph.D., a professor of exercise science at Brigham Young University, found a clue that he wrote about in a June 2019 study in the Journal of Sports Sciences, where he attempted to replicate Hoogkamer and Kram’s 2018 metabolic cost comparison study. Both studies found runners had a longer stride in the Vaporfly than other shoes, which makes sense from an increased efficiency perspective: The farther you travel per stride, the faster you’ll go at a given cadence.But Hunter also measured a few parameters that the CU study didn’t, like vertical oscillation—essentially how high the runner is bouncing with each stride. There, Hunter found that the Vaporfly led runners to bounce higher, which normally would correlate with lower running economy, “unless it’ s not the body that’s generating the energy to;msk&233;-c-37_38.htmlmake that happen,” Hunter says.

The CU study found slightly higher peak forces on impact for the Vaporfly (the opposite of the BYU study), but because the shoe is so soft, Hoogkamer theorizes that it actually feels less harsh to the runner, which enables the runner to take longer strides. That may matter over the course of a season as much as during a single race. At the July 2019 Footwear Biomechanics Conference, Nike research scientist Brett Kirby presented data showing that runners wearing the Vaporfly sustained less muscle damage than a control group wearing other shoes. Reduced;msk&233;-c-22_23.html muscle soreness suggests they could sustain higher training loads.

Whatever the mechanism, it’s undeniably effective. In addition to the CU and BYU studies, Kyle Barnes, Ph.D., a professor of exercise science at Grand Valley State, found similar running economy changes in a comparison with the Adizero Adios Boost 3. And in a messier but far larger sample size, the New York Times’s Upshot examined roughly half a million marathon times from public data like Strava and concluded that, on average, runners wearing the Vaporfly ran three to four percent faster than similar runners in most other shoes, and one percent faster than the next fastest shoe, Nike’s Zoom Streak. (The authors noted that “the analysis suggests that, in a race between;msk&233;-c-67_68.html two marathoners of the same ability, a runner wearing Vaporflys would have a real advantage.”)

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