In their article “Symptoms from repeated intentional and unintentional head impact in soccer players,” Stewart et al.1 explore the link between heading the soccer ball and the development of neurologic symptoms. In contact sports, most notably football,2 there is a link between so-called subconcussive hits and the development of long-term neurologic symptoms. The authors, in previous work,3 saw a similar link between heading the ball in soccer and poorer scores on a memory function test.
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