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J Neurophysiol 83: 3165-3168, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 83 No. 5 May 2000, pp. 3165-3168
Copyright ©2000 by the American Physiological Society

RAPID COMMUNICATION

Phasic Lung Inflation Shortens Inspiration and Respiratory Period in the Lung-Attached Neonate Rat Brain Stem Spinal Cord

Nicholas M. Mellen and Jack L. Feldman

Departments of Neurobiology and Physiological Science, Systems Neurobiology Laboratory, University of California, Los Angeles, California 90095-1527

Mellen, Nicholas M. and Jack L. Feldman. Phasic Lung Inflation Shortens Inspiration and Respiratory Period in the Lung-Attached Neonate Rat Brain Stem Spinal Cord. J. Neurophysiol. 83: 3165-3168, 2000. In intact mammals, lung inflation during inspiration terminates inspiration (Breuer-Hering inspiratory reflex, BHI) and the presence of lung afferents increases respiratory frequency. To test whether these responses could be obtained in vitro, a neonate rat brain stem/spinal cord preparation retaining the lungs and their vagal innervation was used. It was found that 1) the BHI could be replicated in vitro, 2) phasic lung inflation during inspiration caused increased respiratory frequency with declining efficacy as inflation delay increased, and 3) increased respiratory frequency did not require inspiratory shortening.




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