NS 115 - Lecture 17 - Lecture 17 Measuring Body Composition...

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Lecture 17 – Measuring Body Composition October 10, 2008 Energy Balance (Review of last lecture) o ΔWeight = ΔEnergy in – ΔEnergy out o Knowing RQ tells us What we’re burning What substrate we’re using 0.7( fat ) ---------RQ--------- 1.0 ( Carbs) How many calories we’re using o Measuring Energy (ATP) Production ATP Production = ATP Utilization (this is what is actually being measured) RQ = CO2 / O2 Energy produced = Energy Expended o Double labeled Water (indirect measure of calorimetry) Hydrogen lost in water Oxygen lost in water and carbon dioxide Lose the labeled oxygen more rapidly than hydrogen By subtraction: Rate of O2 lost – rate of hydrogen lost Water + carbon dioxide – water = carbon dioxide Can estimate RQ from FQ (food quotient) Indirect Calorimety o Respiratory analysis o Heart rate monitor o Double labeled water Heart Rate as an indicator of energy expenditure o As heart rate goes up so does energy expenditure
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NS 115 - Lecture 17 - Lecture 17 Measuring Body Composition...

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