The increased cushioning of the shoes, especially in the forefoot area of ​​the midsole, affects the biomechanics of the runners and increases the risk of injury, said Christine Pollard, director of the FORCE laboratory at the Bend Campus Functional Orthopaedic Research Center. Co-author of the study.
"These shoes may be suitable for some people, but now we just don't know what their benefits are," said Pollard, an associate professor of sports at OSU-Cascades. "The results of the study show that even after a six-week transition, people do not really change the way they exercise, which may increase their risk of injury." The study was recently published in the American Journal of Sports Medicine. The lead author is JJ Hannigan, a postdoctoral fellow at FORCE Labs.
Since its launch in 2010, the largest shoes have become increasingly popular. There are more than 20 of the largest shoes on the market, but there are few studies on shoes to understand their impact on operational biomechanics. Controlled research, such as the FORCE lab, helps clinicians provide science-based advice to runners.
Researchers at FORCE Lab previously studied shoes before and after the 5K treadmill. The results of the study suggest that the largest shoes may increase impact and load rates, indicating a greater risk of injury. The purpose of this new study is to build on previous research to see how the six-week transition to the biggest shoes can affect the biomechanics of runners.
"We want to see any novelty effects that shoes can have," Pollard said. “This is a very new field and we still have a lot of work to do to understand how these shoes affect the running mechanism.â€
The researchers studied 20 male and female athletes between the ages of 18 and 45 who ran at least 15 miles a week. Participants participated in two biomechanical tests in the laboratory, each test being separated by six weeks. They completed a series of running tests wearing the largest shoes and wearing traditional running shoes.
After the first test, runners received the largest shoe transition schedule. They continued their regular running mileage, but gradually increased their mileage percentage in the largest shoes over a six-week period, with only the largest shoes in the past two weeks.
The results show that in any type of shoe, the movement mechanism does not change over time. The study did show an increase in impact force and loading rate in the largest shoe, which supported the results of earlier studies. There is no difference in these biomechanics after the transition to the largest shoe.
"The biggest concern with shoes is that you have this quality and you load it repeatedly. How do you weaken it?" Pollard said. “We also saw changes in the kinematics of the ankle, or angular movements in the joints. We saw that the biggest shoes were everted for a long time, which may increase the pressure on the legs and may cause injuries.â€
Pollard said more research is needed to understand how the biggest shoes affect biomechanics. Currently, runners and clinicians working with runners should be cautious
"We really don't know to recommend them," Pollard said, and he is also a licensed physiotherapist. “If someone is going to try it out, I suggest that they try it on the treadmill in the running store and see how they feel. They feel how they feel after six weeks.â€
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