A voluntary threshold limit value (TLV®) for hand activity level has been set by the American Conference of Governmental Industrial Hygienists Worldwide (ACGIH®).
The limit is based on epidemiological, psychophysical, and biomechanical studies and applies to “mono-task” jobs performed for four hours or more per day, according to the group. Exposures are characterized in terms of average hand activity level and peak hand force.