Energy expenditure 3941 Vo2 111 VCO2 x1440

where Vo2 and VCO2 are expressed in liters per minute and 1440 is the number of minutes per day. This equation assumes that RQ = 0.8. A version of the Weir equation exists that uses the value of excreted 24-h urinary nitrogen to determine the exact RQ, but this is not often used because the measurement is not usually available at the same time as Vo2 and VCO2. Another value derived from spirometry is RQ = VCO^Vo^ which can guide interpretation of substrate utilization and also serve as an indicator of quality control for the measurements since it extends over a fairly narrow range (0.67-1.3) ( Branson 1999). An even simpler conversion is provided by the equation

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