in 10 patients with pulmonary fibrosis and in seven control subjects , we measured the pressure at the mouth 0 . 1 s after onset of an inspiration against occluded airway ( p 0 . 1 ) , minute ventilation ( vi ) , breathing frequency ( fr ) , tidal volume ( vt ) , inspiratory duration ( ti ) and calculated the mean inspiratory flow ( vt/ti ) and the fraction of the breath cycle devoted to inspiration ( ti/t tot . ) .
C0035203
breathing
C0004048
inspiration