A category and category-ratio scale developed by physiologist G. A. Borg, in which a patient reports his or her level of effort during exercise. The corresponding written descriptions range from “very light” to “very, very hard.” The scale correlates well with cardiorespiratory and metabolic variables such as minute ventilation, heart rate, and blood lactate levels.
A method of measuring exercise intensity developed by Gunnar Borg. Using this method, exercisers are able to sense (or perceive) their exercise intensity levels accurately.