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J Appl Physiol 70: 491-496, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 70, Issue 2 491-496, Copyright © 1991 by American Physiological Society

ARTICLES

Role of phrenic nerve afferents in the control of breathing

D. T. Frazier and W. R. Revelette
Department of Physiology and Biophysics, University of Kentucky, Lexington 40536-0084.

A long-held belief is that respiratory-related reflexes mediated by afferents in the diaphragm are weak or absent. However, recent data suggest that diaphragmatic afferents are capable of altering ventilatory motor drive as well as influencing perception of added inspiratory loads in humans. This review describes the sensory elements of the diaphragm, their central projections, and their functional significance in the control of respiratory muscle activation. The reflexes elicited by electrical stimulation of phrenic nerve afferents and the contribution of diaphragmatic afferents in respiratory load compensation and perception are considered. There is growing evidence that phrenic nerve afferents are activated under a variety of conditions. However, the significance of this input to the central nervous system is yet to be discerned.


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