Apparatus for testing respiratory function

A non-transitory computer-readable storage medium encoded with a computer program, the program comprising instructions that, when executed by a data processing apparatus, define an respiratory function testing apparatus for testing a respiratory function of a subject, the apparatus comprising:

• a respiratory state detection unit configured to acquire a first signal representative of different inspiratory volumes corresponding to a plurality of breaths of the subject and a second signal representative of intrapleural pressures corresponding to the respective different inspiratory volumes, and detect a plurality of respiratory states corresponding to the different inspiratory volumes and their corresponding intrapleural pressures:
• and
• a respiratory state determination unit configured to capture a state of the respiratory function of the subject on the basis of the plurality of respiratory states corresponding to the different inspiratory volumes and their corresponding intrapleural pressures.