ABSTRACT
The concept of perceived exertion and the associated methods for measuring relevant variables were introduced to improve our understanding of physical work and its “costs” (Borg, 1962). The human sensory system can function as an efficient instrument to evaluate the workload by integrating many peripheral and central signals of strain. Psychophysical methods have been developed to complement the physiological methods. Because the way a person experiences the work and the situation is so fundamental to his/her adaptation, performance, and satisfaction, subjective assessments are also judged to be of value in themselves related to quality of life.
