Ooooh, interesting- I’ll take a read, thanks!

I’m guessing like most things of this nature, you’re likely to have super-responders, responders and non-responders?

nickcoury 3 hours ago | parent | next [-]

Yes, most of the studies show there is a very large individual variation. The original 4% figure and similar studies were an average of something like 1-7% across runners.

Also interestingly, the shoe in this record uses much less carbon than past shoes, both saving weight and allowing even more super foam where much of the energy return comes from. Though there so much variance in shoe design and materials there are only theories on how much comes from the plate vs foam vs stack height vs weight vs other factors.

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giarc 5 hours ago | parent | prev [-]

Maybe even placebo effect?

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nickcoury 3 hours ago | parent | next [-]

Quite possible there's a psychological benefit from super shoes, they certainly feel fast. Though there are enough plausible mechanisms it's unlikely to be the major factor.

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sampullman 5 hours ago | parent | prev [-]

So you think the Vaporfly prototypes Kipchoge wore in 2018 placebo'd him into crushing the world record by 78 seconds?

	▲	fragmede 2 hours ago \| parent [-]
		There's an almost inhuman amount of mind over matter psychology when it comes to endurance running. Unless you can duplicate reality multiple times and swap out the shoes without anyone knowing to do properly scientific testing, we can't know for sure what did it. (The shoes probably helped.)