Transcription of Indirect Calorimetry
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Indirect Calorimetry
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 to measurement only be accurately used for metabolic intensities, economy, effici
Economy - refers to the energy cost of an exercise condition. Efficiency - the mechanical energy produced relative to the metabolic energy expenditure For example; The VO 2 during running is often termed “running economy” or “submaximal VO 2”. A person with a lower running VO 2 for a given pace has better economy.
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