![]() ![]() This process relies on oxidative expenditure, so subjects must be in a steady state of aerobic activity to gain an accurate reading, which closely simulates daily activities and exercise. Indirect calorimetry is the method of estimating total body energy expenditure by measuring the respiratory exchange of O2 and CO2 in the body. This process involves keeping a person in a chamber on a treadmill where their changes in body temperature will alter the temperature of the air in the chamber, as well as the water running through a series of tubes within. Define direct calorimetry and indirect calorimetry and describe how they are used to measure energy expenditure.ĭirect calorimetry is the process of quantifying energy production by measuring the body's heat production first described by Zuntz and Hgemann in the late 1800s. ![]()
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