Actually according to Runners World, Medial Tibial Stress Syndrome ( shin splints are caused by rolling your feet excessively inward ( over pronating). To prevent this they say to wear motion-control shoes, and strengthening your calves by holding dumbells while doing toe raises. They also say if you have daily shinsplints for over a month, to see a doctor for a bone scan, because you may have a stress fracture.