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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. Sometimes 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.