Indirect Calorimetry: Measuring Energy Expenditure & Metabolism
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Indirect Calorimetry Basics
Overall Energy Consumption
Indirect calorimetry determines energy consumption by measuring O2 consumption and CO2 production. It uses the equation: Food + O2 → CO2 + H2O, and also accounts for urinary nitrogen (~1g urinary N represents the oxidation of 6.25g protein).
The amount of calories produced per liter of O2 in metabolism is relatively constant, regardless of whether the fuel used is carbohydrates, lipids, or proteins.
Limitations and Applications
Various physiological situations can alter the body's gas exchange and affect energy expenditure estimations. These include changes in acid-base balance due to acidosis or hyperventilation (including hiccups).
Respiratory Quotient (RQ)
RQ = VCO2 / VO2. This ratio indicates... Continue reading "Indirect Calorimetry: Measuring Energy Expenditure & Metabolism" »