Humans - like all animals - get all their energy by combining nutrients with oxygen and releasing CO2. A complete account of our energy metabolism is hidden in our breath, every minute of every day. This has been known and studied by medical professionals for over a century and is used in professional sports laboratories around the world.
Calibre is the first wearable and affordable respiratory/metabolic tracker available to the public, but it uses a method known as "indirect calorimetry" that has been long established and depended on by mainstream medical science. This is professional grade, real time tracking on a whole new level.
Starting with your true, real time calorie burn and breath volume, but also separately determining fat and carb usage (by the minute with biochemical precision), VO2, anaerobic crossover, ketosis, hyperventilation (exhaled CO2), and more.
Remarkably, no. You do not need to input your body weight to get an accurate calorie burn rate. Your breath tells it all! By measuring the amount of oxygen you consume and CO2 you produce, Calibre can accurately tell you how many calories you burn at any given time in any activity.
Carbs and fats are very different in terms of the ratio of CO2 produced vs the amount of oxygen consumed. By measuring both respiratory quantities, we can tell (in real time) how much of each type of fuel is being burned.
