What energy expenditure is defined as 3.5 milliliters of oxygen per kg of body weight per minute?

The definition of 1 MET (Metabolic Equivalent of Task) is the amount of oxygen consumed while at rest, equivalent to consuming 3.5 milliliters of oxygen per kilogram of body weight per minute. This standard measurement is commonly used in exercise physiology to quantify the intensity of physical activities. Thus, when you see 3.5 ml/kg/min of oxygen usage, it directly corresponds to 1 MET, which serves as a baseline for assessing the energy expenditure of various activities in relation to resting metabolic rate.