Re: Helmets: Do you wear one? Why? When?
On Tue, 5 Aug 2008, MuniAddict <> wrote:
>
> Think of it as an insurance policy; it’s there if/when you need it. And
> you never know when you might need it!
You also never know when it might make matters worse. Is that cool
too?
This (apparently mindless) assumption that they must be a good thing,
despite various evidence to the contrary from experience in the
bicycling world, is what confuses me.
The most damaging brain injuries are those from rotational forces. A
helmet makes them worse (bigger lever arm, higher friction in most
circumstances) and offers no protection against them. So why neglect
that class of injury when deciding whether to wear a helmet?
I agree they are probably very effective against painful and
embarrassing scrapes and digs in your scalp - but is it worth risking
making the most serious sort of injuries worse in order to avoid
events that are painful but far from life-threatening? Of course
there are degrees of this - if it was sure to save lots of cuts and
scrapes and the chance of rotational injury was completely
insignificant then the answer might be that they are worthwhile, but
that’s not the argument that is presented. The argument presented is
that they literally cannot hurt, and that is not true.
If wearing a helmet made it more likely that you end up a
dribbling vegetable, would you wear one religiously?
If not, how to reconcile the fact that when states in Australia made
bicycle helmets compulsory for bicyclists, the rate of serious head
injuries went up?
For unicycling, there is even less serious evidence than for
bicycling, of course, and the argument is far from clear even for
bicycling. Also, the skate-type helmets many (most?) people here
adopt are probably less worse for torsional effects than the
high-speed bicycling sort (long tail, thin skin over expanded
polystyrene). You can certainly make a good argument for unicycling
being more likely to result in the sort of injuries that a helmet is
good for, and less likely to be the ones it is bad for. But to assume
that there are no scenarios in which a helmet is bad for the victim
of the accident is simply wrong.
regards, Ian SMith
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