Transcription of Indirect Calorimetry - UNM
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Indirect Calorimetry - UNM
Dr. Robert RobergsFall, 2010 Indirect Calorimetry1 Indirect CalorimetryIndirect CalorimetryCALORIMETRYThe science that quantifies the heat release from metabolism is termed CircuitOpen CircuitRespiration Chamber Expired gas analysis Carbon/nitrogen excretion Labeled water Respiration chamberDr. Robert RobergsFall, 2010 Indirect Calorimetry2 Bomb CalorimeterDr. Robert RobergsFall, 2010 Indirect Calorimetry3 Heat release & caloric equivalents macronutrientsThe heat release and caloric equivalents for oxygen for the main macronutrients of catabolism (simplified).Food Rubner s kcal/g Kcal/g (Bomb cal.) Kcal/g (body) RQ Kcal/L O2 CHO mix Fat mix Protein mix Alcohol Mixed Diet Dr. Robert RobergsFall, 2010 Indirect Calorimetry4 Applications of Indirect CalorimetryApplications of Indirect Calorimetry Metabolic IntensityAbsolute -VO2(mL/kg/min or L/min)Relative -% VO2max ; % LT Maximal Cardiorespiratory and Muscular Endurance (VO2max) Economy and Efficiency Accumulated O2 Deficit Metabolic Rate (BMR, RMR) EPOC Energy Expenditure VO2 KineticsLimitations Of Indirect CalorimetryLimitations Of Indirect body -the sum of all active tissue in body, not just contracting skeletal sophisticated and expensive sensitive
Indirect Calorimetry 8 Measurements From Indirect Gas Analysis Calorimetry Mixing bag Flow turbine Expired gas analyzers Flow pump Understanding ATPS and STPD Gas volumes vary with temperature and pressure, thus there needs to be a standard way to express gas volumes so that pressure and temperature variations are removed.
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