A researcher is trying to design an experiment to measure the amount of energy a person uses during different activities. He proposes to measure heart rate as an indirect measure of metabolic rate. Which of the following would give him a more precise measure of energy use?
A. Comparing the amount of sugar released in the urine before and after the activity
B. Measuring the amount of carbon dioxide released from the lungs during the activity
C. Monitoring the number of calories voluntarily consumed following the activity D. Tracking the increase in sweat production over the course of the activity
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