ICYMI the ever-inquisitive Alex Hutchinson has left Competitor (RIP Competitor, which is *kind of* still Competitor but not really) and now writing for Outside Online.
Most recently he tackled the issue of those fancy new Nike shoes, the Vaporfly, which purportedly improve efficiency by 4%. Now, for a while that was just Nike making claims, though the lack of actual scientific evidence did not stop many people from rushing out to drop hundreds (!) of dollars on them. But last week the results of an actual, rigorous randomized control trial run by a legit, reputable lab (the University of Colorado’s Locomotion Laboratory) were published in a for-real peer reviewed science journal (
Sports Medicine), and it's official; the Vaporfly really does (or at least can) honestly and truly improve runners' efficiency by over 4%.
Yes, the study was funded by Nike because that's how research works, but given the reputation of the lab and the researchers involved and how the paper was published, you can be reasonably sure that the results are legit and not just more Nike propaganda. So, yeah, if someone is wearing them and seems to have an astonishingly good race, there is a nonzero change that the shoe really did have something to do with it. (As you probably already know, Eliud Kipchoge was wearing them when he clocked that just-barely-not a 2 hour marathon in Italy earlier this year, and Shalane Flanagan was wearing them when she destroyed the NYC marathon last month; see also Galen Rupp in Chicago and Camille Herron destroying the 100 mile record by over an hour.) To quote Hutchinson, "There’s something going on with these shoes."