We understand the fourth group as the most suitable for evaluating the possible injury which may have the repetitive pitching. Invariably in this group always found something: neuroproteina increased S-100B and mild concussion symptoms such as dizziness and headaches, Finally, when considering the force of the blows, we believe that Medicine is not mathematics can be used strictly as if we were machines. A stroke of an acceleration of 10 g can cause damage to a person while another may not feel a 50 g. What is clear, is to head the ball is a head injury that does not produce acute symptoms, unless there is a course of several headers or are not properly executed, but that in a comparison of soccer is the rule. Finally, we believe that intentionally head the soccer ball is a skull and head trauma that over several years of practicing this sport, are possible chronic brain injury, similar to that seen in dementia pugilistic . Official site: Sam Lesser Penn.