Effect of head impacts on diffusivity measures in a cohort of collegiate contact sport athletes

Thomas W. McAllister, James C. Ford, Laura A. Flashman, Arthur Maerlender, Richard M. Greenwald, Jonathan G. Beckwith, Richard P. Bolander, Tor D. Tosteson, John H. Turco, Rema Raman, Sonia Jain

Research output: Contribution to journalArticlepeer-review

154 Scopus citations


Objective: To determine whether exposure to repetitive head impacts over a single season affects white matter diffusion measures in collegiate contact sport athletes. Methods: A prospective cohort study at a Division I NCAA athletic program of 80 nonconcussed varsity football and ice hockey playerswho wore instrumented helmets that recorded the accelerationtime history of the head following impact, and 79 non-contact sport athletes. Assessment occurred preseason and shortly after the season with diffusion tensor imaging and neurocognitive measures. Results: There was a significant (p = 0.011) athlete-group difference for mean diffusivity (MD) in the corpus callosum. Postseason fractional anisotropy (FA) differed (p = 0.001) in the amygdala (0.238 vs 0.233). Measures of head impact exposure correlated with white matter diffusivity measures in several brain regions, including the corpus callosum, amygdala, cerebellar white matter, hippocampus, and thalamus. The magnitude of change in corpus callosum MD postseason was associated with poorer performance on a measure of verbal learning and memory. Conclusion: This study suggests a relationship between head impact exposure, white matter diffusion measures, and cognition over the course of a single season, even in the absence of diagnosed concussion, in a cohort of college athletes. Further work is needed to assess whether such effects are short term or persistent.

Original languageEnglish (US)
Pages (from-to)63-69
Number of pages7
Issue number1
StatePublished - Jan 7 2014
Externally publishedYes

ASJC Scopus subject areas

  • Clinical Neurology


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