ABSTRACT
The actual strength that people generate depends primarily on clusters of factors whose effects overlap and influence each other. Body motion, or lack thereof, is a major factor that determines the force, the torque, the work, the power, or the impulse transmitted from the body to an external object. Much of the information available on body strength describes the outcomes of static testing. A designer who wants to consider the operator strength has to make a series of decisions when developing a new process or device. There are three major types of requirements in hand tasks: for accuracy, for strength exertion, and for displacement. If a person must stand at work, fairly little force and only infrequent operations of foot controls should be required because, during these exertions, the operator must support the body solely on the other leg. For a seated operator, however, the operation of foot controls is much easier because the seat carries the body.
