The style of your running shoes isn’t just making a fashion statement. It may be controlling the way you run and setting you up for injuries down the road.
That’s what researchers at the University of Kansas Hospital found when they put a dozen high school athletes through their paces on a treadmill.
When the teens ran barefoot or in flat-soled racing shoes, they generally landed on the front halves of their feet, the researchers say. But when the young athletes put on standard-issue running shoes with thick, cushioned heels, they instantly switched to a radically different gait, striking the treadmills with their heels.
Although there is no direct evidence that landing on your heels when you run leads to long-term injury, some experts say that running this way may over time increase wear and tear to knees and hips.
“It may be more natural to land on your forefoot. It’s uncomfortable to land on your heel,” said Scott Mullen, the sports medicine specialist who co-authored the study. “But there’s something in the makeup of the (cushioned) shoe that promotes that kind of heel strike.”
Mullen presented his findings in Chicago at the annual meeting of the American Academy of Orthopaedic Surgeons. The study will be published in the Journal of Pediatric Orthopaedics.
Mullen, a marathoner and triathlete, put the teens on a treadmill to add some perspective to the growing reaction among runners against thick-heeled shoes. In fact, the relative merits of different shoe soles have become a regular topic of debate in recent years.
Barefoot running or running in “minimalistic” shoes with as little as a third of an inch between the sole of the foot and the ground has become popular as a more “natural” way to run. The idea was promoted by the 2009 best-selling book “Born to Run,” about the Tarahumara Indians of Mexico, who run for hundreds of miles without injury wearing thin-soled sandals.
The injury-prevention message has also been fueled by some research findings, including a Harvard study from 2010 that looked at runners in Kenya. The researchers found that even on hard surfaces, barefoot runners who landed on their forefeet gave their bodies less of a jolt than did runners who wore shoes and landed on their heels.
Shoe companies, which had been adding padding to their products since they debuted in the 1970s, changed course. They have come out with shoes that minimize the difference in the thickness of the heel and sole of the shoe.
Mullen wanted to see how the different kinds of shoes affected young athletes who hadn’t settled on a running style.
His subjects were six boys and six girls ranging in age from 13 to 18 who were recruited from local track teams. They took turns on a treadmill that was surrounded by 12 infrared cameras recording motion in three dimensions from markers attached to their feet, ankles and knees.
Each did short runs at different speeds going barefoot, wearing the conventional cushioned-heel running shoes most of them used for training or wearing racing flats with little or no heel elevation.
In the cushioned shoes, runners landed on their heels 70 percent of the time. But in track flats, they hit heel-first less than 35 percent of the time, and barefoot 30 percent of the time.
“Simply by changing their footwear, the runners’ foot strike would change,” Mullen said. “When they ran in the cushioned heel of an average running shoe – even when running a five-minute mile – the athletes landed on their heel first.”