The<unk>  <unk>  or<unk>  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<unk>  value indicates which macronutrients are being metabolized, as different energy pathways are used for fats, carbohydrates, and proteins. If metabolism consists solely of lipids, the<unk>  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<unk>  of a mixed diet is 0.8. Some of the other factors that may affect the<unk>  are energy balance, circulating insulin, and insulin sensitivity. It can be used in the alveolar gas equation.
Respiratory quotient
CO2 content
Oxygen equivalent
Oxygenation index
Lactate threshold
Gas exchange
Metabolic equivalent of task
Oxygen enhancement ratio