Breathing resistance

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The breathing resistance is the resistance that has to be overcome when breathing and which results from the viscosity of the inhaled gas and the geometry of the windpipe or artificial ( regulator ) airways. The breathing resistance is made up of the exhalation and inhalation resistance (expiration and inspiration resistance). The natural resistance results from the ratio of the pressure difference and the volume flowing in and out over time:

${\displaystyle R={\frac {p}{(dV/dt)}}}$

R is measured in kPa / (l / s) and is in the range from 0.1 to 0.2 kPa / (l / s) for an adult.

The breathing resistance can be determined using a body plethysmograph .