Indirect calorimetry
A method to estimate metabolic rate by measuring oxygen consumption and CO2 production, used by Layne Norton to assess his RMR.
Videos Mentioning Indirect calorimetry

#33 – Rudy Leibel, M.D.: Finding the obesity gene and discovering leptin
Peter Attia MD
A technique used to measure energy expenditure by quantifying oxygen consumption and carbon dioxide production, typically involving a mask or hood.

205 - Energy balance, nutrition, & building muscle | Layne Norton, Ph.D. (Pt.2)
Peter Attia MD
A method to estimate metabolic rate by measuring oxygen consumption and CO2 production, used by Layne Norton to assess his RMR.

Dr. Peter Attia — Interview on Life-Extension, Ultra-Endurance, and More
Tim Ferriss
A technique used to measure energy expenditure by sampling oxygen consumption and CO2 production, similar to a VO2 Max test, often conducted in metabolic chambers.

Intermittent Fasting to Improve Health, Cognition & Longevity | Dr. Satchin Panda
Andrew Huberman
A method to measure oxygen intake and carbon dioxide output to determine whether the body is consuming glucose or fat as an energy source.