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In the early 1970s, computer technology enabled on-site data processing, some real-time analysis, and even graphical displays of metabolic variables, such as O 2, CO 2, and air-flow, thereby encouraging academic institutions to test accuracy and precision in new ways. [10] [11] A few years later in the decade, battery-operated systems made debuts.
The metabolic equivalent of task (MET) is the objective measure of the ratio of the rate at which a person expends energy, relative to the mass of that person, while performing some specific physical activity compared to a reference, currently set by convention at an absolute 3.5 mL of oxygen per kg per minute, which is the energy expended when sitting quietly by a reference individual, chosen ...
The rate of energy expenditure during the test corresponds to approximately five time the basal metabolic rate. [2] The number of heart beats from 30 seconds to 1 minute after the end of the 3-minute step test is used to assess cardiovascular fitness level.
In contrast, field metabolic rate (FMR) refers to the metabolic rate of an unrestrained, active animal in nature. [4] Whole-animal metabolic rates refer to these measures without correction for body mass. If SMR or BMR values are divided by the body mass value for the animal, then the rate is termed mass-specific.
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Kleiber's plot comparing body size to metabolic rate for a variety of species. [1]Kleiber's law, named after Max Kleiber for his biology work in the early 1930s, states, after many observations that, for a vast number of animals, an animal's Basal Metabolic Rate scales to the 3 ⁄ 4 power of the animal's mass.