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Appendix A
Ergonomics
This chapter provides guidance and hints to help you work in a comfortable
and ergonomically low-risk environment. If you experience pain or discomfort
while using this or any other equipment, you should stop working and
review this chapter. If the discomfort continues, stop using the equipment
and consult a doctor as soon as possible.
Setting up and using equipment
Some people experience physical discomfort while using computers. Some-
times this discomfort leads to Repetitive Strain Injury (RSI), also known as
cumulative trauma disorder or repetitive motion injury. Setting up and using
equipment properly can help minimize this discomfort. Well-designed and
properly adjusted equipment may not be sufficient to eliminate all potential
problems. How you perform your computer activities is also important.
What is RSI?
RSI is a type of injury caused by the irritation or inflammation of soft tissues
such as muscles, nerves, or tendons. In extreme cases, this irritation can lead
to permanent tissue damage. RSI has been a documented problem for
workers performing specific tasks such as assembly line work, meatpacking,
sewing, playing musical instruments, and working with a computer. It may
also result from other activities, such as tennis.
What causes RSI?
RSI is caused by certain demanding activities that exceed the body’s ability.
Common factors associated with RSI include too many uninterrupted
repetitions of an activity or motion, performing an activity in an awkward or
unnatural posture, maintaining static posture for prolonged periods, failing
to take frequent short breaks, and stress. Certain medical conditions, such as
rheumatoid arthritis and diabetes, may contribute to RSI.