Thinner Cortex in Collegiate Football Players With, but not Without, a Self-Reported History of Concussion

Emerging evidence suggests that a history of sports-related concussions can lead to long-term neuroanatomical changes. The extent to which similar changes are present in young athletes is undetermined at this time. Here, we tested the hypothesis that collegiate football athletes with (n=25) and without (n=24) a self-reported history of concussion would have cortical thickness differences and altered white matter integrity relative to healthy controls (n=27) in fronto-temporal regions that appear particularly susceptible to traumatic brain injury. Freesurfer software was used to estimate cortical thickness, fractional anisotropy was calculated in a priori white matter tracts, and behavior was assessed using a concussion behavioral battery. Groups did not differ in self-reported symptoms (p>0.10) or cognitive performance (p>0.10). Healthy controls reported significantly higher happiness levels than both football groups (all p<0.01). Contrary to our hypothesis, no differences in fractional anisotropy were observed between our groups (p>0.10). However, football athletes with a history of concussion had significantly thinner cortex in the left anterior cingulate cortex, orbital frontal cortex, and medial superior frontal cortex relative to healthy controls (p=0.02, d= -0.69). Further, football athletes with a history of concussion had significantly thinner cortex in the right central sulcus and precentral gyrus relative to football athletes without a history of concussion (p=0.03, d= -0.71). No differences were observed between football athletes without a history of concussion and healthy controls. These results suggest that previous concussions, but not necessarily football exposure, may be associated with cortical thickness differences in collegiate football athletes.