Fig. 1.

Example of voluntary cough waveform measured with cough spirometry. Selected derived objective measures are delineated on the waveform and referenced in Table 2 including a inspiratory phase duration, b inspiratory peak flow, c compression phase duration, d peak expiratory flow rate, and e cough expired volume. Expiratory rise time is calculated by subtracting time at end of compression from peak expiratory flow time. Cough volume acceleration is not depicted but is calculated by dividing peak expiratory flow rate by the expiratory rise time