Research shows economy gains at slower paces, but they’re smaller and not guaranteed.
, confer the same running economy advantage to athletes who run at slower paces.
“There’s a lot of people who don’t fit under the umbrella of the speeds that have been tested in all this laboratory research, and a lot of people are asking: Should I spend my money on this? Do they work for slower people?” said Joubert. “That was the next logical question to me.
The researchers chose the Asics Hyper Speed as the control shoe because it lacks the technology of the Vaporfly but matches its mass. This was an important variable to match because mass affects running economy; a heavier shoe will require more energy to move and could therefore confound results. Onecompared the Vaporfly to runners’ everyday training shoes, but most regular training shoes are more than 100 grams heavier—the equivalent of about 40 pennies.
“The shoe is not creating energy for you; it’s only giving back what you put into it,” explained Joubert.Before you decide “an advantage is an advantage,” there is one other finding from this study that should give runners pause. While the results from the 16 test subjects showed a 0.9–1.4 percent average improvement in running economy, one third of the participants actually showed worse running economy when they ran at the 9:40/mile speed in the Vaporflys, compared to the control shoe.
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