transdiaphragmatic pressure ( pdi ) was measured at functional residual capacity ( frc ) in four normal seated subjects during supramaximal , supraclavicular transcutaneous stimulation of one phrenic nerve ( 10 , 20 , 50 , and 100 hz -- 0.1 ms duration ) before and after diaphragmatic fatigue , produced by breathing through a high alinear inspiratory resistance .
C0035203
breathing
C0004048
inspiratory