Jack,
Whether you have a low, medium, or high arch is irrelevant. What affects overpronation most is how much your arch flexes during your footstrike. Typically someone with a high arch does not have a lot of arch flexion, and someone with a low arch does. Many running books and magazines have oversimplified and turned this correlation into a definitive connection. Unfortunately, even many specialty running stores often make the same mistake. The only way to know if you overpronate is to have someone watch you while you run and see how much your foot rolls over. Not while you walk, not while you stand, while you run.
Forefoot strikers overpronate MUCH less frequently than heel strikers. When you land on your forefoot, you engage the muscles in your foot and lower leg, which helps resist rolling inward. When you land on your heel, you don’t engage any muscles until the rest of your foot comes down to the ground, at which point it’s too late for the muscles to stop you from rolling too far. It doesn’t matter that much if you have a low, medium, or high arch, it matters whether you engage those foot muscles when your foot hits the ground. That’s why it’s so important to have someone watch you while you run. You might very well overpronate when you walk, but if you run with good form you may be fine in a neutral shoe.
Over time you can/will develop a higher arch by actively working the muscles in your foot and lower legs. The more you land on your forefoot when you run, the stronger your muscles will become. They will be able to support you more effectively for longer duration runs. And when you’re not running, they will support you more effectively also – you’ll see a higher and more rigid arch. Most of the dancers that I’ve fitted for shoes have had VERY high arches because they use their feet all the time to support themselves. Same goes for the fastest runners.
On a different note, MTSS is not something to mess around with. As you’ve already seen, if you keep up the stress on your leg bones when you have MTSS you end up with a stress fracture. MTSS is a sign that your body cannot rebuild your bones fast enough for the stress you’re putting on them. You might be putting too much stress on your lower leg bones by landing on your heel, or your bones might not be that strong, or your rebuilding mechanism might operate more slowly than average. If the first is true, barefoot running or running in flats may help you improve your technique and reduce the strain that’s causing the MTSS. If not, then don’t push it or you may end up with another stress fracture.
Last note: Nike is going to announce a shoe called the “Free” in the next two months. If you’re interested in improving your technique by running barefoot but can’t find anyplace you trust to actually be barefoot, the Free is the best possible alternative – better than racing flats or XC shoes. It is designed specifically to mimic running barefoot, and has absolutely no midsole structure at all, front-to-back or side-to-side. VERY cool shoe, and one of the most interesting things I’ve seen from Nike in the time I’ve been working with them.
Lee Silverman
JackRabbit Sports
Brooklyn, NY