24/02/2026
And now for the C in the A to Z of functional breathing..
Our biggest friend is Carbon Dioxide. yes it's a waste gas, but it's so much more.
The main impulse to breathe comes from the levels of CO2 in our blood stream. The more sensitive we are to CO2 the more we breathe, which sets off a pattern of off loading CO2 and not allowing a build up in the blood and tissues. Why would we want that? Well it's related to the Bohr effect, as mentioned under B. Haemoglobin needs a bit of coaxing to let go of the Oxygen it carries. The rise of Co2 lowers the pH in the blood and this gives the haemoglobin the nudge to let go of that 02, which goes into the cells.. This is a very simplistic explanation as I'm just trying to cover the basics.
Co2 has some other great uses. The most important is that it is a smooth muscle relaxant. That's means your blood vessels, your heart, your visceral organs, so better food flow to your organs. Happier organs and muscles.
We have a rough measurement of your tolerance of CO2 called the Control Pause. It is one of the first things we teach in Buteyko and is quite simple to do. It acts as your measurement of progress on your functional breathing journey. It is best learnt from an instructor.
Tps - breathe only through your nose at all times. Mouth breathing off sets more C02. You can even breathe through your nose whilst doing exercise. Just start slowly and manageably. .Taking a rest when you find you need to breathe through your mouth.