Not necessarily: The increased and stacking vulnerability to brain damage after concussions might not go away ever. I don't think this has been researched.
> Not necessarily: The increased and stacking vulnerability to brain damage after concussions might not go away ever. I don't think this has been researched.
There are some permanent cumulative effects of concussions, though it's pretty well-accepted that repeated concussions in close succession (without sufficient time for recovery) is worse than concussions that are spaced out. Second impacts are much more likely to have serious consequences, including death, than initial impacts of similar magnitude[0].
You'll never get "definitive proof" of this because a double-blind study would be extremely unethical (let alone impractical), but there's enough understanding of the underlying science to make this conclusion relatively safely.
In short: repeated head injury is bad regardless of how much time is allocated to recovery in between and has some permanent cumulative effects, but repeated head injury in short succession (for some definition of "short") is markedly worse.
Not necessarily: The increased and stacking vulnerability to brain damage after concussions might not go away ever. I don't think this has been researched.