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♦ Sit in an upright chair and adopt a good posture. Relax your shoulders and rest your lower back against the back of the chair.

♦ Do not change your breathing before taking your CP. Take a small breath in (two seconds) and a small breath out (three seconds). Hold your nose on the ‘out’ breath, with empty lungs but not too empty. Holding your nose is necessary to prevent air entering into the airways.

♦ Count how many seconds you can comfortably last before you need to breathe in again. Hold your breath until you feel the first need to breathe in. Release your nose and breathe in through it.

♦ Your first intake of breath after the CP should be no greater than your breath prior to taking measurement; you should not hold your breath for too long as this may cause you to take a big breath after measuring the CP.

Measuring the Control Pause (a)

Measuring the Control Pause (b)