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Abstract
By recording electrical impulses from muscles during movements, it is possible to find the number of muscles taking part in the movement and when they are in activity and to estimate the force of contraction. The different factors which influence typewriting can therefore be studied by electromyography.
From these experiments it would appear that the most important factor is thorough practice on the typewriter. The person tested must also use favourable equipment (e.g. chair and table) and a satisfactory working position. The environment must be well lighted, not too cold, nor too noisy. The typist must use the highest preferred working speed, and take a short rest when tired.