Oxygen consumption is the amount of oxygen consumed used in the oxidation process during the metabolism of an organism. The oxygen consumption rate of aerobic organisms is often used for the estimation of the metabolic rate because; the amount of heat produced for each liter of oxygen consumed during metabolism is nearly constant irrespective of the nutrient source.
Routine oxygen consumption:
It is the total volume of oxygen consumed by an organism in unit time regardless of body weight when it is spontaneously active and not forced. Routine oxygen consumption rate is represented as liter O2/ h (liter O2 h-1).
Mass specific oxygen consumption:
It is the total volume of oxygen consumed by an organism in relation to its unit body mass (i.e) ratio of total oxygen consumption/mass of the organism in kg. Mass specific oxygen consumption rate is represented as liter O2/kg-1/h-1.
Organisms with less body mass have a higher rate of oxygen consumption reflecting its higher metabolic rate. Larger animals with higher body mass have comparatively low rate of oxygen consumption indicating its lower metabolic rate.
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