Derived from « Metabolic Equivalent of Task », this unit measures the intensity of physical activity. A MET unit is defined by energy expenditure while seated and at rest (3.5ml/O2/kg). Physical activities are those corresponding to an energy expenditure equal to or greater than 2 METs[i].
[i] Jetté, M., Sidney, K., & Blümchen, G. (1990). Metabolic equivalents (METS) in exercise testing, exercise prescription, and evaluation of functional capacity. Clinical cardiology, 13(8), 555-565 doi: 10.1002/clc.4960130809.