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There are a number of important points to bear in kind when measuring your CP. Breathe normally before taking your CP. Try not to take a big breath before you start as this will give an inconsistent reading.

If you have just completed breathing exercises, wait two or three minutes. Measuring your CP directly after exercises will give an inaccurate reading due to an existing air shortage from the exercise.

Do not breathe all the air out of your lungs because this will be very uncomfortable and will result in a reduced CP. Also do not try to hold your breath for too long as this will give an incorrect reading. The CP is a measurement of your progress only: it is not an exercise to see how long you can hold your breath before you burst!

Hold your breath only until you feel the first urge to breathe in. You may not like the result but it is the correct one and that’s what you need to know. You can then take steps to correct it and gauge your progress with confidence.

It does take some practice before you become consistent in measuring your control pause. The measure is subjective because it is difficult to know what the first urge is. At first, it is very easy to push a little too hard and this is the case when the breath after taking the CP is greater than before.

With practice, the control pause will become more consistent. A reading of the level of carbon dioxide in the alveoli will be achieved with a correct control pause.