2
u
If your forearms are not at right angles to your upper arm, adjust
the height of the keyboard or the chair until they are.
u
If your elbows rest on the chair’s armrests, do not let this cause
you to raise your shoulders from their relaxed position.
Step 2: Wrists
Rest your fingers on the keyboard. Your wrists should be straight with
your forearms.
u
If your wrists bend upward or downward, adjust the height of the
keyboard or chair to align your wrists properly with your
forearms.
u
If your wrists bend inward or outward, adjust the position of your
hands to align your wrists properly with your forearms.
You may find it helpful to use a wrist support for short periods of rest.
Step 3: Head and Eyes
The monitor screen should be between 18 inches (45.1 centimeters)
and 31 inches (78.7 centimeters) from your eyes (
Humanscale
, MIT
Press). Your head should be angled downward slightly when you look
at the center of the screen. If you are continually referring to a
document, place the document at the same height and angle as the
screen.
u
If the monitor is too high or too low, use a suitable support to
place it at a comfortable height.
u
Do not assume that using the system base unit as a support places
the monitor at the correct height.
Step 4: Back
The chair should firmly support your back when you sit up straight,
and your thighs should be at right angles to your torso. The chair
should also support the lumbar curve of your back.
u
If the chair’s backrest does not provide lumbar support, use a pad
or pillow to provide lumbar support.
u
If you can adjust the chair’s backrest angle, make sure your thighs
and your torso are nearly at right angles when your feet rest on the
floor.
