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reflects the protein contribution.) When the rate abdominal of nitrogen excretion in urine is measured, oxidation rate of each macronutrient can be calculated, revealing exactly what abdominal the metabolic fire is burning at any time. In practice, respiratory gas exchanges can be measured in three ways. 1.Inspired and expired air flows and gas concentrations can be measured directly through a mask or mouthpiece. This is ideal when fast response or short-term measurements are needed, such as in exercise. 2.Gas concentrations may be measured in a constant flow of air passing through a canopy over a person’s abdominal head. This is ideal for resting measurements made on a couch over a period of 20 minutes or more. 3.Gas concentrations can be measured at the air inlet and outlet of a ventilated room. This is ideal for measurements lasting from overnight to several days.
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