jonathan, I consider one of my many concussions to be a day I spent riding amusement park rides a year or so after a severe concussion. The Tilt-A-Whirl did me in. Shaky roller coasters (the wooden type are the worst) can also do me in.

As nightnurse said, the subconcussive impacts can aggravate your prior concussion. You are likely much more sensitive to any impact, concussive or sub-concussive, after your previous concussion.

FYI A sub-concussive impact is any impact to your brain that does not cause an immediate concussive state. Sub-concussive impacts tend to be cumulative since they do not cause the subject to remove themselves from further risk of another sub-concussive impact.

Football players have been studied to show they often suffer 700 to 900 sub-concussive impacts during a single season. The real damage does not often manifest until the athlete is in their late 30's or early 40's.