Apple Power Macintosh 4400 User Manual download pdf (Page 138)

Musculoskeletal discomfort

As with any activity that involves sitting for long periods of time, using a

computer can make your muscles sore and stiff. To minimize these effects, set

up your work environment carefully, using the guidelines that follow, and take

frequent breaks to rest tired muscles. To make working with your computer

more comfortable, allow enough space in your work area so that you can

change position frequently and maintain a relaxed posture.

Another type of musculoskeletal concern is repetitive stress injuries (RSIs),

also known as cumulative trauma disorders (CTDs). These problems can

occur when a certain muscle or tendon is repeatedly overused and forced into

an unnatural position. The exact causes of RSIs are not totally understood, but

in addition to awkward posture, such factors as the amount of repetition, the

force used in the activity, the individual’s physiology, workplace stress level,

and lifestyle may affect the likelihood of experiencing an RSI.

RSIs did not suddenly arise when computers were invented; tennis elbow and

writer’s cramp, for example, are two RSIs that have been with us for a long

time. Although less common than other RSIs, one serious RSI discussed more

often today is a wrist problem called carpal tunnel syndrome, which may be

aggravated by improper use of computer keyboards. This nerve disorder

results from excessive pressure on the median nerve as it passes through the

wrist to the hand.

This section offers advice on setting up your work area to enhance your

comfort while you use your computer. Since the effects of repetitive

movements associated with using a computer can be compounded by those of

other work and leisure activities to produce or aggravate physical problems,

proper use of your computer system must be considered as just one element

of a healthy lifestyle.

No one, of course, can guarantee that you won’t have problems even when you

follow the most expert advice on using computer equipment. You should

always check with a qualified health specialist if muscle, joint, or eye

problems occur.

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Appendix A

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Apple Power Macintosh 4400 User Manual Page 138