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Hearing
Loss
Your helmet Is inadequate defense
A
recent survey on my system has revealed that the vast majority of
visitors here engage in touring activities with their bikes (based
on the sample that responded.)
I
thought it would be appropriate, therefore, to post an article on
a threat that is largely restricted to those of us that ride our
bikes over long distances and over the years. That threat is
to the loss of your ability to hear. As you read further you
will find that it has already happened
to you, it will get worse, and that your helmet is
an inadequate defense against it.
I know, you're thinking that I am about to rag on the
Harley-Davidson sound. Wrong. While it's true that
loud pipes will result in faster and more profound hearing damage,
it's not the motorcycle sounds that are the principal cause of
that damage. Indeed, even if your motorcycle makes no sound
whatever, long distant, long duration motorcycle riding damages
your hearing.
It
turns out that wind noise does the most damage to your hearing.
It is constant, loud, and very difficult to get away from.
At
highway speeds you will find that wind noise is well over 100 db,
even when wearing a helmet! Wearing a helmet cuts the
noise by only about 3 db, and then only if it is at least a 3/4
shell and properly fitted. (An improperly fitted helmet
actually INCREASES wind noise!!!) ONE HOURS of exposure to
110 db will damage your hearing. At 115 db it takes only 15
MINUTES. The damage is relentless, irreversible, and
cumulative.
Following
is a chart demonstrating wind noise at 30 MPH and 60 MPH within
various brands of helmets as published in a 1991 issue of
Motorcycle Magazine.
What
can be done about this? How can we protect our hearing from wind
noise?
Well,
first, you can make sure that you wear a helmet, that it is at
least a 3/4 shell, and that it fits properly. A properly
fitted helmet has a lining that presses against the skin on
your cheeks as well as across your forehead. Not
only does your helmet not shift around on your head when it fits
properly, but it cuts wind noise from reaching your ears.
Second,
you can wear earplugs. There are some problems associated
with doing this, not withstanding the fact that in some states it
is illegal to do so. (You can legally drive a motorcycle if you
are deaf, but not wear earplugs - fancy that.) Aside from
the law, many people simply cannot stand (or get used to) wearing
them. And, if they are improperly inserted, provide very
little noise reduction benefit and will hurt in no time at all.
Earplugs
are cheap. You can buy good quality earplugs by the dozens
and their cost will be less than $1 a pair when you do so.
(I cannot imagine buying one pair and reusing them day after day -
what a foolish way to save a penny.) If earplugs are not for
you, then try small pieces of cotton. They are more
comfortable, though not nearly as effective, and I'll guarantee
you don't reuse them just to save a penny or two.
Wearing
earplugs of any kind, it seems to me, is counter-productive at
speeds below about 40 MPH. But if you ride our highways for
any distance at all you will CERTAINLY be better off having
worn them (and, by the way, you will actually be able to hear
better with them in your ear than not at those speeds.)
Just
because your hearing is already a 'little' damaged from wind noise
you should not think it can't get worse. Riding a motorcycle
at highway speeds is a GUARANTEED way to damage your hearing - and
potentially profoundly. The majority of our hearing needs
involves frequencies below 16 KHz. These sounds are what we
use when we talk (and listen.) These also happen to be the
frequencies most affected by wind noise hearing damage.
Or,
if you prefer to ignore this bit of advice, practice saying 'Huh?'
But don't get used to doing that - expecting this minor
inconvenience to work forever. Your hearing will get worse.
For
perspective, a noisy restaurant produces about 80 db of noise.
A subway produces about 90 db of noise. A rock band
generates about 110 db, a car horn is about 115 db, a gunshot is
about 140 db.
Osha
says that hearing loss can begin at 90 db. Max safe exposure
at 110 db is 1 hour, and only 15 minutes to sounds in excess of
115 db.
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