oxygen consumption (O2)

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oxygen consumption (O2)

the rate of uptake of oxygen in the lungs, usually expressed in litres per minute. Measured in indirect calorimetry as an estimate of metabolic rate, taking the 'calorific value' of 1 litre of oxygen as 4.8 kcal (for an average ratio of carbohydrate to lipid oxidation), therefore 1 L.min-1 as equivalent to 4.8 kcal.min-1, 20 kJ.min-1 or 333 watts.