Originally Posted by
closetbiker
I think the point is still valid though. Aerobic exercise reduces the rate of brain injury with greater success than helmet usage does.
(and the numbers of stroke victims are far greater than the numbers of bare headed brain damaged cyclist)
( - did I say that right? - )
Yes. This is most likely (almost certainly) correct (of course, it depends highly on how much aerobic exercise is being done). Many, many cyclists don't cycle anywhere near enough for the aerobic exercise to have any real benefit.
And, of course, by itself, this statement (being true) really doesn't address the question of whether helmets work or whether they are (or can be) useful.
Note that I'm only criticizing your use of "prevent" for arguing
for something (applied to strokes) and
against something else (applied to concussions).