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Spirofit blog
Factors That Influence Resting Metabolic Rate
Learn the physiological and protocol factors that influence resting metabolic rate, what raises RMR readings, and a practical pre-test checklist.
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How SpiroFit Calibrates & Best Practices for Testing
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.
What Is Fat Max?
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 Brief History of Metabolic Testing
A history of metabolic testing, from Priestley and Lavoisier to the Douglas bag, Weir and Frayn equations, metabolic carts, CPET, and portable analyzers.
What Is Metabolic Testing and How SpiroFit Is Redefining the Industry
Learn what metabolic testing is, covering VO2, VCO2, RER, and RMR. See how portable analyzers measure breath by breath while wearables only estimate.