Why does the runner wear reference shoes rather than run barefoot during measurements?
In most cases measurements are performed on the hard floor of a sports shop. Under these conditions most runners tend to run only on their toes, i.e. rather than use their heels they take the entire impact with the front of their feet. Measuring pronation is pointless in this case. This applies all the more to measurements performed outdoors, where running barefoot is usually not feasible. Another reason is that the impact and pronation forces during barefoot running are very different from what they are when running in shoes. Drawing inferences about running in shoes would be a bit like comparing apples and oranges.
