This article is from the Ergonomics and Typing Injury FAQ, by Dan Wallach firstname.lastname@example.org with numerous contributions by others.
A. One reason why RSI is becoming more prevalent is because computers are
now allowing us to do more office tasks which formerly allowed us to
change activity. For example, a typewriter at one time required using a
return carriage, "white out" for mistakes, breaks for paper installation,
and getting up to file papers in a cabinet.
Computer word-processing now eliminates these "microbreaks". In short,
computers have greatly simplified office activity, an advance that has at
least one important disadvantage. The danger is found in the possibility
for long duration, continuous, and relatively motion free, precise,
muscular activity called "static exertion". Humans were not well
"designed" for this.