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Your feet may love running shoes. But what about the rest of your body? New research finds that running shoes actually increase the pressure on ankles, knees and hips¹—more than high heels can during walking. That’s according to a study in the Journal of Injury, Function and Rehabilitation².

Researchers enlisted³ 68 injury-free runners who normally logged at least 15 miles a week. The subjects ran at their own pace on a treadmill⁴, first in modern running shoes and then again barefoot. It turns out that running shoes upped the pressure, or torque, on knee joints⁶ by 38 percent over bare feet. The hips experienced a pressure increase of 54 percent. Walking in inch-and-a-half high stilettos only worsened knee torque by about 20 percent in previous studies.

Since stressful joint⁵ pressure can cause osteoarthritis, should runners start hitting the pavement in bare feet? Probably not. True, some elite⁷ marathoners do run sans sneakers. But apparently⁸ letting the rubber hit the road is like various spiritual rituals: tough on the body, but good for the sole.

—Molly Webster