wouldn't think there would be differences in nt's and ...US....in reaction to a concussion. i've had at least 2 and possibly 4 and......IT CERTAINLY HASN'T EFFECTED ME!
i started running when i was 30 trying to relieve depression and went on to being a marathoner, a bicycle racer and free climber. depression went away and i was.....happy....for the first time in my life. for you aussies, climbed ayers rock in 17 minutes. a complete effort! then i was murdered by a drunk driver while i was training and everything went away.
now i like to watch f1 races and follow bike racing. sports with balls really turn me off now, reminds me of michael vick and his resurection and how i despise the general population of humans.