The results are shown in Figure 1. 2.3 Observer Rating Force is an index of the effort exterted get, hold, or use a work object or to support the weight of the body. Both averate and peak forces should be assessed. Higher forces may be exerted for shorter periods of time. Both average and peak forces should be rated.
Force can be assess from observations of the worker and from consideration of task factors.
Some people exert considerably more than the minimum force to keep objects from slipping from their hand. Instrumentation for measuring force may require expensive equipment and considerable expertise. Armstrong et al. It can be seen that the subjects exert more force on Kb3 than Kb2. Electromyography Electromyography is the measurement of electrical potentials produced by contracting muscles.