Mac Pro Server - Understanding Ergonomics

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Understanding Ergonomics

Here are some tips for setting up a healthy work environment.


When you use the keyboard, your shoulders should be relaxed. Your upper arm and
forearm should form an approximate right angle, with your wrist and hand in roughly
a straight line.

Change hand positions often to avoid fatigue. Some computer users might develop
discomfort in their hands, wrists, or arms after intensive work without breaks. If you
begin to develop chronic pain or discomfort in your hands, wrists, or arms, consult a
qualified health specialist.


Position the mouse at the same height as the keyboard and within a comfortable reach.


An adjustable chair that provides firm, comfortable support is best. Adjust the height
of the chair so your thighs are horizontal and your feet are flat on the floor. The back of
the chair should support your lower back (lumbar region). Follow the manufacturer’s
instructions for adjusting the backrest to fit your body properly.

You might have to raise your chair so that your forearms and hands are at the proper
angle to the keyboard. If this makes it impossible to rest your feet flat on the floor, use
a footrest with adjustable height and tilt to make up for any gap between the floor and
your feet. Or you can lower the desktop to eliminate the need for a footrest. Another
option is to use a desk with a keyboard tray that’s lower than the regular work surface.

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Chapter 6

Last, but Not Least


Arrange the display so that the top of the screen is slightly below eye level when you’re
sitting at the keyboard. The best distance from your eyes to the screen is up to you,
although most people seem to prefer 18 to 28 inches (45 to 70 cm).

Position the display to minimize glare and reflections on the screen from overhead
lights and nearby windows. If possible, use a tiltable display stand. The stand lets you
set the display at the best angle for viewing, helping to reduce or eliminate glare from
lighting sources you can’t move.

Thighs tilted




Screen positioned to
avoid reflected glare

Forearms and

hands in a

straight line

Forearms level

or tilted slightly

Lower back


Feet flat on the floor
or on a footrest

Top of the screen at or
slightly below eye level
(You may need to adjust
the height of your display
by raising or lowering
your work surface)

Clearance under
work surface

18–28 in. (45–70 cm)

More information about ergonomics is available on the web:

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Chapter 6

Last, but Not Least

Avoid Hearing Damage


Permanent hearing loss may occur if earbuds or headphones are used at

high volume. You can adapt over time to a higher volume of sound that may sound
normal but can be damaging to your hearing. If you experience ringing in your ears
or muffled speech, then stop listening and have your hearing checked. The louder the
volume, the less time required before your hearing can be affected. Hearing experts
suggest that to protect your hearing:


Limit the amount of time you use earbuds or headphones at high volume


Avoid turning up the volume to block out noisy surroundings


Turn the volume down if you can’t hear people speaking to you