NUTR 4010 Study Guide - Final Guide: Lean Body Mass, Oxygen-18, Indirect Calorimetry
6 Dec 2018
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Impractical for large scale studies: because the space is confined it is not accurate for daily living activities, total energy from metabolism: ~ 40% atp, ~60% heat. Indirectly calorimetry: energy metabolism depends on o2 consumption (vo2) and co2 production (vco2, vo2 and vco2 are measured, or estimated in order to calculate. Ree: metabolic cart, volumes of inspired and expired air are measured, gas analyzers measure the conc of o2 and co2 in inspired and expired air, used in clinical practice for patients with extreme metabolic stress. In research: results were all within 200 kcal of each other, higher readings may be due to anxiety or sitting upright, lower may be due to air leaks: further studies needed. If obese persons were included in the sample used to develop equation for ree, there is no need to use a different weight: could use actual bw.
