Foot and ankle structure differs between sprinters and non-sprinters

The skeletal structure of the foot and ankle differs significantly between human sprinters and non-sprinters, according to Penn State researchers. Their findings not only help explain why some people are faster runners than others, but also may be useful in helping people who have difficulty walking, such as older adults and children with cerebral palsy.

According to Stephen Piazza, associate professor of kinesiology, the research is the first to use magnetic resonance imaging to demonstrate that sprinters have significantly longer bones in their forefeet than non-sprinters and reduced leverage in their Achilles tendons than non-sprinters.

The researchers took MRI images of the right foot and ankle of each of the subjects. They then used specialized software to analyze the images. The scientists found that the Achilles tendon lever arms of sprinters were 12 percent shorter than those of non-sprinters. They also found that the combined length of the bones in the big toes of sprinters was on average 6.2 percent longer than that of non-sprinters, while the length of another foot bone, the first metatarsal, was 4.3 percent longer for sprinters than for non-sprinters. Their results are reported in the current issue of the Proceedings of the Royal Society B. Eurekalert!