NEC VERSA 5000 Series User Manual page 142

Some nerve, tendon, and muscle disorders (musculoskeletal
disorders) may be associated with repetitive activities,
improper work environments, and incorrect work habits.
Examples of musculoskeletal disorders that may be
associated with certain forms of repetitive activities include:
carpal tunnel syndrome, tendinitis, tenosynovitis, de
Quervain's tenosynovitis, and trigger finger, as well as
other nerve, tendon, and muscle disorders.
Although some studies have shown an association between
increasing hours of keyboard use and the development of
some musculoskeletal disorders, it is still unclear whether
working at a computer causes such disorders. Some doctors
believe that using the keyboard and mouse may aggravate
existing musculoskeletal disorders.
Some people are more susceptible to developing these
disorders due to pre-existing conditions or psychosocial
factors (see "Pre-existing Conditions and Psychosocial
Factors" later in the appendix).
To reduce your risk of developing these disorders, follow
the instructions in this appendix. If you experience
discomfort while working at your computer or afterwards,
even at night, contact a doctor as soon as possible. Signs of
discomfort might include pain, tenderness, swelling,
burning, cramping, stiffness, throbbing, weakness, soreness,
tingling and/or numbness in the hands, wrists, arms,
shoulders, neck, back, and/or legs.
A-2 Setting Up a Healthy Work Environment