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Articles in PresS, published online ahead of print August 22, 2002
Am J Physiol Regu Physiol, 10.1152/ajpregu.00271.2002
Submitted on May 15, 2002
Accepted on August 21, 2002
1 Department of Neurobiology, Howard Florey Institute of Experimental Physiology and Medicine, University of Melbourne, Parkville, Victoria, Australia; Department of Physiology, University of Lyon, School of Medicine, Lyon, France
2 Department of Physiology, University of Lyon, School of Medicine, Lyon, France
3 Department of Neurobiology, Howard Florey Institute of Experimental Physiology and Medicine, University of Melbourne, Parkville, Victoria, Australia
* To whom correspondence should be addressed. E-mail: rmca{at}hfi.unimelb.edu.au.
Extracellular recordings were made in the right nucleus ambiguus of urethan-anesthetized rats from 33 neurons that were activated at constant latency from the craniovagal cardiac branch. Their calcu-lated conduction velocities were in the B-fiber range (1.6-13.8 m/s, median 4.2) and most (22/33) were si-lent. Active units were confirmed as cardiac vagal motoneurons (CVM) by the collision test for antidromic activation and by the presence of cardiac rhythmicity in their resting discharge (9/9). Brief arterial pressure rises of 20-50 mmHg increased the activity of 5/5 CVM by 0.1 ±0.02 spikes/s/mmHg from a resting 3.8 ±1.2 spikes/s; they also recruited activity in 2/4 previously silent cardiac branch-projecting neurons. CVM firing was modulated by the central respiratory cycle, showing peak activity during inspiration (8/8). Rat CVM thus show firing properties similar to those in other species, but their respiratory pattern is distinct. These findings are discussed in relation to mechanisms of respiratory sinus arrhythmia.
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