Apple PowerBook G4 15-inch Betriebsanweisung PDF herunterladen (Seite 77)

Appendix B Safety, Use, and Care Information 77

Understanding Ergonomics

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

Keyboard and Trackpad

When you use the keyboard and trackpad, your shoulders should be relaxed. Your

upper arm and forearm should form an angle that is slightly greater than a right angle,

with your wrist and hand in roughly a straight line.

Use a light touch when typing or using the trackpad and keep your hands and fingers

relaxed. Avoid rolling your thumbs under your palms.

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.

Chair

An adjustable chair that provides firm, comfortable support is best. Adjust the height of

the chair so your thighs are horizontal and your feet 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.

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Apple PowerBook G4 15-inch Betriebsanweisung Seite 77