Understanding ergonomics, Keyboard and trackpad – Apple PowerBook G4 (17-inch, Double Layer Super Drive) User Manual
Page 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.
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