Weir formula
The Weir formula is a formula used in indirect calorimetry, relating metabolic rate to oxygen consumption and carbon dioxide production. According to original source, it says:[1]
- Metabolic rate (kcal per day) = 1440 (3.94 VO2 + 1.11 VCO2)
where VO2 is oxygen consumption in litres per minute and VCO2 is the rate of carbon dioxide production in litres per minute. The formula can also be written for units of calories per day where VO2 is oxygen consumption expressed in millilitres per minute and VCO2 is the rate of carbon dioxide production in millilitres per minute:
- Metabolic rate (kcal per minute) = 3.94 VO2 + 1.11 VCO2
Another source gives[2]
- Energy (kcal/min) = (respiration in L/min times change in percentage oxygen) / 20
This corresponds to:
- Metabolic rate (cal per minute) = 5 (VO2 in ml/min)
References
- Patrick Burns; Michael Snow. "Indirect Calorimetry" (PDF).
- "Techniques available for measuring energy expenditure". United Nations University.
Further reading
- Weir, J. B. de V. (1 August 1949). "New methods for calculating metabolic rate with special reference to protein metabolism". The Journal of Physiology. 109 (1–2): 1–9. doi:10.1113/jphysiol.1949.sp004363. PMC 1392602. PMID 15394301.
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