Learn the physiological and protocol factors that influence resting metabolic rate, what raises RMR readings, and a practical pre-test checklist.

Learn how SpiroFit calibrates using ambient air without gas tanks, how its sensors work, and best practices for warm-up and back-to-back testing.

Understand what Fat Max is, how peak fat oxidation is measured via respiratory gas exchange, and how to use this intensity to guide endurance training.

A history of metabolic testing, from Priestley and Lavoisier to the Douglas bag, Weir and Frayn equations, metabolic carts, CPET, and portable analyzers.

Learn what metabolic testing is, covering VO2, VCO2, RER, and RMR. See how portable analyzers measure breath by breath while wearables only estimate.