The technique of direct calorimetry and indirect calorimetry are used to determine the amount of calories a person expends each day.
In indirect calorimetry, a total amount of heat produced by the human body is measure by measuring the amount of carbon dioxide released by the body or measuring the amount of nitrogen based wastes produced by the body. Because in this method, we are not directly measuring the amount of heat, this is called indirect calorimetry.
In direct calorimetry, a person is made to be in a big box like structure which allows a less amount of activity. In this method, the total heat loss is directly measured by the box. This method is called direct calorimetry because in this method we are measuring the heat produced by the body directly.
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