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2torial #0432:
Learn2 Avoid Repetitive Stress

"My computer is trying to kill me!"
Ever wonder why you're in such a bad mood after
working on your computer? Have you been
experiencing wrist pain, tired eyes or neck and
back pain? Well, you're not alone: there are more
people working on keyboards and in front of
monitors than ever before. Many of them have been
experiencing what is now termed repetitive stress
injury, or RSI.
RSI has actually been around for quite some
time. Before there were lots of people working on
computer keyboards, there were lots of people
working on typewriter keyboards. In the past,
though, any complaints about painful wrists, or
backaches were generally dismissed as imaginary or
opportunistic.
Once computer work became part of just about
everybody's job, recommendations were developed to
help people avoid these problems. Here are some
that you can apply to your workplace with a minimum
of fuss and/or cost.

Prepare to adjust your habits as well as your
physical surroundings. Remember when your parents
would tell you not to sit too close to the TV set?
Well, what do you think you're doing when you plant
your face a foot away from a computer monitor?
Let's face it: computers are not good for our
physical health. Eyestrain, wrist pain, back
troubles and a fat butt are what we get from
working too long in front of our computers. We can,
however minimize these complaints by setting up our
work areas properly, and using some common sense.
That means modifying your workstyle to take breaks,
and modifying your awareness, so as to notice the
creeping causes of strain before they become real
problems.
Consider your desk
If you or your firm has a spare desk hanging
around, the temptation is almost irresistible to
simply plop a computer on top and declare it a
"workstation." That can be fine - so long as the
desk offers at least a majority of these features:
- Your keyboard should be just below elbow
height, so that your elbows are bent at a 90
degree angle. The best way to achieve this is by
having an adjustable keyboard surface that
descends to the required level.
- The desk should not shake or quiver when
used. This means a heavily built, properly
braced piece of furniture, with legs adjusted
for full contact on the floor. Use shims if
necessary.
The desk should be deep enough to allow the
monitor to be placed at least 20 inches away from
your eyes. You can pull the desk back from the wall
to make extra room, but don't balance the monitor
precariously on the far edge.
Consider your chair
The chair should be adjustable in several
different ways. If you can't afford a good new
chair, buy a good used chair.
- The chair should adjust vertically to allow
your forearms and thighs to be parallel with the
floor when working.
- The chair should have an adjustable
backrest, that supports your lower back when
sitting upright.
- The chair should have armrests, and wheels
to roll back easily.
Consider your monitor

There is no substitute for a good monitor.
You'll be staring at this thing for hours at a
time, so insist on the following features:
- The monitor should have a "dot pitch" of no
greater than .28 for 17 inch or smaller
monitors, .30 for monitors larger than that.
- The monitor should not appear to flicker. If
it flickers, then it probably doesn't have a
high enough 'vertical refresh rate.' A vertical
refresh rate of at least 68 hertz (often
abbreviated as Hz) is generally sufficient. To
get a good sense of a monitor's flicker rate,
try looking at it obliquely, out of the corners
of your eyes.
- The monitor should be sufficiently bright,
and should not distort at the edges.
- The monitor should have an adjustable angle,
so that you can look directly at it, without
craning your neck
Consider your keyboard
Keyboards mostly look the
same, but here is one thing to watch out for:
- The keyboard should have a nice, springy
feel to the keys. You'll be amazed at the
difference in typing effort from one keyboard to
the next.
Some newer keyboards are being made in a "split"
configuration, which allows a more natural hand
position. These are highly recommended by people
who use them, but are not to everyone's taste.
Pay attention to your
posture
If your equipment is
adjustable, as described above, you should be able
to follow these guidelines to minimize back and
neck pain:
- Your keyboard should be just below elbow
height, so that when your wrists are straight
and your fingers are on the keys your forearms
are parallel to the floor.
Your back and neck should be straight when you
look directly at the monitor. If you need to raise
the monitor (or lower your chair) to do this, do
so. Don't slouch!
-end-

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