Accurately Measure Calories Burned in Time Period

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The most accurate method for measuring calories burned over time is through metabolic rate assessment, specifically using breath respirometry. This technique involves measuring VO2 (oxygen consumption) and VCO2 (carbon dioxide production), as oxygen is essential for energy metabolism and carbon dioxide is the byproduct of calorie burning. For those seeking a deeper understanding of respirometry and metabolic rate measurement, the book "Measuring Metabolic Rates" by John R. B. Lighton provides additional methodologies and insights.
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What is the most accurate way of measuring the amount of calories a person has burned in a certain time period?
 
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You measure the metabolic rate over time.

Breath Respirometry - measure VO2 and VCO2 - the rate of consumption/transport of Oxygen and the production/transport of Carbon Dioxide.

Oxygen is required to fully "burn" energy sources, Carbon Dioxide is the end product of burning Calories.

If you are really interested in Respirometry and measuring metabolic rates see:
"Measuring Metabolic Rates" By John R. B. Lighton It mentions other methodologies.
 

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