where M is in kilojoules per unit of time, V02 and VC02 are in liters STPD per unit of time and N is in grams per unit of time. For example, if IWIO2 = 600 L/day, IUICO2 = 500 L/day (respiratory quotient, or RQ = 0.83) and N = 25 g/day, then M = 12,068 kJ/day. The simpler equation,,,(5;1) gives a value of 12,180 kJ per day.
Indirect calorimetry also allows computation of the nutrient oxidation rates in the whole body. An index of protein oxidation is obtained from the total amount of nitrogen excreted in the urine during the test period. One approach to calculating the nutrient oxidation rate is based on the O 2 consumption and CO2 production due to the oxidation rates of the three nutrients, carbohydrate, fat, and protein, respectively. In a subject oxidizing c g/min of carbohydrate (as glucose) and f g/min of fat, and excreting n g/min of urinary nitrogen, the following equations, based on T.§bIe„„5.;1), can be used:
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