lecture #4 Notes - Measurement of Human Energy Expenditure...

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Lecture #4 Measurement of Energy Measurement of Human Energy Expenditure Understand the following: Heat of combustion (Calories) Atwater factors How to measure kCal Quantify energy release in metabolism Quantify food mixture metabolized
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Lecture #4 Measurement of Energy What is a Calorie? A measure of heat transfer 1. Quantity of heat necessary to raise the temperature of 1 kg (1L) of water 1 degree Celsius (from 14.5 to 15.5 degrees Celsius. 2. If a food contains 300 kCal then releasing the potential energy trapped within this food’s chemical structure increases the temperature of 300 L of water 1 degree Celsius. 3. Different foods contain different amounts of heat energy.
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Lecture #4 Measurement of Energy How to Measure Calories? The Bomb Calorimeter Figure 1. Bomb calorimeter directly measures the energy value of food.
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Lecture #4 Measurement of Energy Heat of Combustion The heat liberated by oxidizing (burning) food in a bomb calorimeter represents its heat of combustion
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