Chaotic dynamics of ventilatory flow in humans

The present study provides further insights into the chaotic nature of the ventilatory behaviour in spontaneously breathing healthy humans by applying the noise titration method to ventilatory flow signals gathered in this setting. In five subjects with normal breathing pattern and end-tidal CO₂, the noise titration method gave a positive noise limit ranged from 6 to 43%. Our study shows that the noise titration technique does find chaos in the ventilatory behaviour of healthy humans at rest, therefore opening the way to further investigations