The toes of most shoes, especially sneakers, bend ever so slightly upward. While of which curve, called a bottom spring, can make walking easier plus more comfortable, it may also damage feet and potentially open them up to some common (and painful) foot-related injury.

That’s the conclusion attained by Harvard evolutionary biologist Daniel E. Lieberman, his former undergraduate pupil Oliver B. Hansen ’19, in addition to two former postdoctoral analysts, Freddy Sichting and Nicholas B. Holowka, who studied toe springs and their effect on the biomechanics of running.

The scientists found that the more curved a bottom spring is, the less power the foot included in the shoe has to put in when pushing off on the ground while walking. Actually foot muscles are doing less work, and that, the researchers hypothesize, may have consequences.

“It stands to reason that should the foot muscles should want to do less work, then they’re likely to have less endurance considering the fact that many thousands of times on a daily basis you push off on the toes, ” said Lieberman, your Edwin M. Lerner II Professor regarding Biological Science and senior author on the paper. The work about toe springs is described in Scientific Reports.

The researchers say this potential weakness could create people more susceptible to medical ailments like plantar fasciitis — a welcome, hard to repair, and painful inflammation of the thick, web-like band of cells that connects the heel bone to the toes.
“One of the biggest problems nowadays of people’s feet is plantar fasciitis, ” Lieberman explained. “We think that what the results are is that people are banking on their plantar fascia to do what muscles normally accomplish. When you get weak muscles as well as the plantar fascia has to perform more work, it’s not really evolved for that and thus it gets inflamed. ”

The scientists say their next step should be to validate their hypothesis with future studies.

“From a good evolutionary perspective, wearing modern shoes which may have arch supports, cushioning, and other supportive features is an extremely recent phenomenon, ” claimed Sichting, who’s now any post-doctoral researcher and school assistant in human locomotion during Chemnitz University of Technologies in Germany and appeared to be the paper’s first source. “Several lines of studies suggest that weak 12 inches muscles may be partly a consequence of such features. In our own research, we were interested in a nearly ubiquitous element associated with modern shoes that will not be studied before: the upward curvature at the cab end of the shoe. ”

He means the toe early spring, of course, which constantly flexes the toe box above ground and is particularly a feature of modern footwear, especially athletic shoes.

The project started once Sichting and Lieberman met at the conference in Boston, and (of course) went for the run by the Charles Canal, during which they brought up foot biomechanics and plantar fasciitis. That led to Sichting coming to Lieberman’s Skeletal Biology and Biomechanics Lab in 2018 to figureout on the project together with Holowka, who’s now an helper professor of anthropology along at the University of Buffalo, along with Hansen, a former Crimson rower who graduated that has a concentration in human evolutionary biology. Hansen worked on the paper as part of his senior honor’s thesis.

Inside the experiment, 13 participants walked barefoot along with in four pairs of custom-made sandals on a specially designed treadmill built with force plates and the infrared camera system to measure what amount power is put in to each step. The sandals each had varying examples of toe spring angles — through 10 degrees to 40 degrees. They were which will mimic the stiffness and shape in commercially available shoes.
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