1 Data from the NCAA Injury Surveillance System (ISS) for the period 1994-96.

2 NCAA Guideline 2i, Concussion or Mild Traumatic Brain Injury (mTBI) in the Athlete, June 1994, Revised July 2004, 2009, July 2010, July 2011.


4 Data from the NCAA Injury Surveillance System (ISS) for the period 1994-96

5 Boston University CTE Center – FAQ.

6 Id.

7 Guskiewicz, et al., Recurrent concussions and risk of depression in retired professional football players, MED. SCI. SPORTS EXERC., Vol. 39, June 2007, at 903.


Chronic Traumatic Encephalopathy in Athletes: Progressive Tauopathy following Repetitive Head Injury, J. Neuropathol. Exp. Neurol. 2009 July; 68(7).

9 Id.

10 NCAA00002937

11 AAN Statement at 581 (recognizing cumulative damage of multiple concussions); Handbook CTE Study ¶ 37, at 53 (“There are potentially serious complications of multiple or severe concussions, including second impact syndrome, postconcussive syndrome, or post-traumatic encephalopathy”); see also Sean Gregory, Study: Kids Competing Too Soon After Concussions, TIME (Jan. 21, 2009),

12 Guskiewicz, et al., Association between recurrent concussions and late-life cognitive impairment in retired professional football players, NEUROSURGERY, Vol. 50, October 2005.

13 Bey, et al., Second Impact Syndrome, West Journal of Emergency Medicaine, February 2009;

14 Id.

15 Guskiewicz, et al., Cumulative Effects Associated With Recurrent Concussion in Collegiate Football Players, The NCAA Concussion Study, THE JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, Vol. 290, No. 19, November 19, 2003, at 2549.