Apple 145 manual Health concerns associated with computer use, Repetitive stress injuries

Health concerns associated with computer use

Muscle soreness, eye fatigue, and other discomforts and injuries sometimes associated with computer use can result from performing any number of activities. Misuse of the same muscles during multiple activities can create a problem that might not otherwise exist. For example, if you engage in nonwork activities that involve repetitive stress on the wrist—such as bicycling—and also use your computer’s keyboard improperly, you may increase your likelihood of developing wrist problems. Preventing health problems requires careful attention to the way you use your body at all times.

The most common health effects associated with using a computer are musculoskeletal discomfort and eye fatigue. Any activity that involves sitting for long periods of time, including using a computer, can make your muscles sore and stiff.

To prevent discomfort and fatigue:

mArrange your work space so the furniture is properly adjusted for you and doesn’t contribute to an awkward, inappropriate working posture.

mTake frequent short breaks to give your muscles and eyes a chance to rest and refresh.

Repetitive stress injuries

Repetitive stress injuries (RSIs) can occur when a certain muscle or tendon is repeatedly overused and forced into an unnatural position. The exact causes of RSIs are not understood, but it is thought that awkward posture, the amount of repetition, the force used in the activity, and your physiology and lifestyle may all contribute to their occurrence.

One RSI often discussed in connection with computer use 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. The information on the next few pages can help you recognize hand positions that may cause discomfort.

Since the effects of repetitive movement associated with computer use 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 just one element of a healthy lifestyle. No one 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.

26 Chapter 1: Setting Up Your Macintosh PowerBook