Back معامل التنفس Arabic Respiratorischer Quotient German بهره تنفسی Persian Quoziente respiratorio Italian 呼吸商 Japanese ശ്വസനഗുണാങ്കം Malayalam Współczynnik oddechowy Polish
 | It has been suggested that this article be merged with Respiratory exchange ratio. (Discuss) Proposed since February 2024. |
The respiratory quotient (RQ or respiratory coefficient) is a dimensionless number used in calculations of basal metabolic rate (BMR) when estimated from carbon dioxide production. It is calculated from the ratio of carbon dioxide produced by the body to oxygen consumed by the body. Such measurements, like measurements of oxygen uptake, are forms of indirect calorimetry. It is measured using a respirometer. The respiratory quotient value indicates which macronutrients are being metabolized, as different energy pathways are used for fats, carbohydrates, and proteins.[1] If metabolism consists solely of lipids, the respiratory quotient is approximately 0.7, for proteins it is approximately 0.8, and for carbohydrates it is 1.0. Most of the time, however, energy consumption is composed of both fats and carbohydrates. The approximate respiratory quotient of a mixed diet is 0.8.[1] Some of the other factors that may affect the respiratory quotient are energy balance, circulating insulin, and insulin sensitivity.[2]
It can be used in the alveolar gas equation.
- ^ a b Widmaier, Eric P.; Raff, Hershel; Strang, Kevin T. (2016). Vander's Human Physiology: The Mechanisms of Body Function (14th ed.). New York: McGraw Hill. ISBN 9781259294099.
- ^ Ellis, Amy C; Hyatt, Tanya C; Gower, Barbara A; Hunter, Gary R (2017-05-02). "Respiratory Quotient Predicts Fat Mass Gain in Premenopausal Women". Obesity. 18 (12): 2255–2259. doi:10.1038/oby.2010.96. ISSN 1930-7381. PMC 3075532. PMID 20448540.