Since the aim of incentive spirometry is to increase transpulmonary pressure through slow deep maximal inspiration, increasing tidal volume and decreasing respiratory frequency (6,13), the best values of minute ventilation, tidal volume and respiratory frequency were obtained during exercise with volume-oriented ...

How does a spirometer measure tidal volume?

Tubes run from the chamber to a mouthpiece and back again. Breathing in and out through the tubes makes the lid of the chamber fall and rise. The volume of air the person inhales and exhales can be calculated from the distance the lid moves.

What does incentive spirometry measure?

When you breathe from an incentive spirometer, a piston rises inside the device and measures the volume of your breath. A healthcare provider can set a target breath volume for you to hit. Spirometers are commonly used at hospitals after surgeries or prolonged illnesses that lead to extended bed rest.