Running with the feet in a supinated position can lead to an increased chance of injury, O’Connor said.
“If the foot has a tendency to stay in the supinated position and there is a lack of pronation or underpronation, it means the foot will have less propensity to absorb shock,” she said. “This is because the forces when running will be on the outer border of the foot when landing, and they will stay on the outer border through the whole of the loading phase of running. The surface area of loading will be on the heel of the outer border of the foot and the outside of the forefoot.
“This is where the runner can have injuries; the heel fat pad, planterfasciitus and metatarsal stress fractures of the foot. Common injuries higher up the chain will include lateral knee and ITB friction syndrome.
“This foot type is more likely to get injuries, so form can be altered to prevent excessive loading by adapting a midfoot strike and a higher cadence. This will aid efficiency.”
You can find out how to train for a midfoot strike with our feature on correct running foot placement.