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indirect calorimetry

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indirect calorimetry,
the measurement of the amount of heat generated in an oxidation reaction by determining the intake or consumption of oxygen or by measuring the amount of carbon dioxide or nitrogen released and translating these quantities into a heat equivalent. Compare direct calorimetry.

calorimetry [kal″o-rim´ĕ-tre]
measurement of the heat eliminated or stored in any system.
direct calorimetry measurement of the amount of heat produced by a subject enclosed within a small chamber.
indirect calorimetry measurement of the amount of heat produced by a subject by determination of the amount of oxygen consumed and the amount of carbon dioxide eliminated.

calorimetry
measurement of the heat eliminated or stored in any system.

direct calorimetry
measurement of heat actually produced by the organism which is confined in a sealed chamber or calorimeter.
indirect calorimetry
estimation of the heat produced by means of the respiratory differences of oxygen and carbon dioxide in the inspired and expired air.


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Fat oxidation was calculated from expired air analysis using indirect calorimetry during an incremental treadmill walking test.
For this reason, indirect calorimetry is considered to be the 'gold standard' for assessing energy expenditure in hospitalised patients.
These parameters, taken together, are measured through a process referred to as indirect calorimetry which is often a routine test in the Pulmonary Function Laboratory.
 
 
 
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