PMID: 8941553Nov 1, 1996Paper

Phrenic motoneuron discharge during sustained inspiratory resistive loading

Journal of Applied Physiology
S Iscoe

Abstract

I determined whether prolonged inspiratory resistive loading (IRL) affects phrenic motoneuron discharge, independent of changes in chemical drive. In seven decerebrate spontaneously breathing cats, the discharge patterns of eight phrenic motoneurons from filaments of one phrenic nerve were monitored, along with the global activity of the contralateral phrenic nerve, transdiaphragmatic pressure, and fractional end-tidal CO2 levels. Discharge patterns during hyperoxic CO2 rebreathing and breathing against an IRL (2,500-4,000 cmH2O.1-1.s) were compared. During IRL, transdiaphragmatic pressure increased and then either plateaued or decreased. At the highest fractional end-tidal CO2 common to both runs, instantaneous discharge frequencies in six motoneurons were greater during sustained IRL than during rebreathing, when compared at the same time after the onset of inspiration. These increased discharge frequencies suggest the presence of a load-induced nonchemical drive to phrenic motoneurons from unidentified source(s).

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Citations

Sep 18, 1997·Journal of Applied Physiology·J D Road, A M Cairns
Dec 16, 2003·The Journal of Physiology·Jeremy A SimpsonSteve Iscoe
Nov 11, 1999·American Journal of Respiratory and Critical Care Medicine·S C GandeviaA De Troyer

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