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J Appl Physiol 81: 2260-2266, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology
Vol. 81, No. 5, pp. 2260-2266, November 1996
CONTROL OF BREATHING, CIRCULATION, AND TEMPERATURE

Phrenic motoneuron discharge during sustained inspiratory resistive loading

Steve Iscoe

Department of Physiology, Queen's University, Kingston, Ontario K7L 3N6, Canada

Received 7 March 1996; accepted in final form 11 June 1996.

Iscoe, Steve. Phrenic motoneuron discharge during sustained inspiratory resistive loading. J. Appl. Physiol. 81(5): 2260-2266, 1996.---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 · l-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).

rebreathing; fatigue; diaphragmatic afferents; diaphragm; transdiaphragmatic pressure

0161-7567/96 $5.00 Copyright © 1996 the American Physiological Society




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