For over a year, people visiting the Boston Museum of Science took off their shoes for science. Visitors took a stroll on a 20-foot-long mechanized gait carpet and a special plate that measured how their feet landed and pushed off when they walked.
In total, Boston University anthropologist Jeremy DeSilva has measured how 650 museum visitors walk, amassing a database that shows the wide array of natural variation in human locomotion.
In a study published in the American Journal of Physical Anthropology, DeSilva has presented the first analysis of 398 adults, finding that 8 percent of those museum visitors had feet that retain a key characteristic of nonhuman primates: a flexible midfoot that can bend, and which may have helped with climbing trees.
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For years, researchers had wondered whether this particular characteristic, called a midtarsal break, existed only in nonhuman primates. The people whose feet had this feature not only had a more flexible midfoot, they also had flatter feet.
This line of research intersects with DeSilva’s other work, which tries to reconstruct how human ancestors walked.
Next, DeSilva is planning a study that will try to connect the dots between form and function, examining both how people walk and what the bones in their feet look like.
Carolyn Y. Johnson can be reached at cjohnson@globe.com. Follow her on Twitter @carolynyjohnson.