dc.contributor.author |
Barrett, Carolyn |
en |
dc.contributor.author |
Turner, MJ |
en |
dc.contributor.author |
Bolter, CP |
en |
dc.date.accessioned |
2012-03-16T01:22:31Z |
en |
dc.date.issued |
2011 |
en |
dc.identifier.citation |
JOURNAL OF PHYSIOLOGICAL SCIENCES 61(2):151-160 01 Mar 2011 |
en |
dc.identifier.issn |
1880-6546 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/14528 |
en |
dc.description.abstract |
Abstract Previous reports indicate that when aortic pressure (AP) falls below the threshold (Pth ) for baroreceptor sensitivity, activity in the aortic depressor nerve (ADN) may increase. To quantify and explain this anomalous behaviour, we analysed curves describing the relationship of baroreceptor fibre activity in rabbit left ADN to AP. Data were obtained in anaesthetised New Zealand White rabbits. Occlusion and release of cuffs around the inferior vena cava and descending aorta generated AP ramps (25–140 mmHg). Response curves were obtained for 173 fibres in 26 animals. Thirty percent of curves had a nadir (J-shaped curve), and in 40% activity was always present. In fibres showing activity below Pth, firing was predominantly diastolic, switching to systolic firing at Pth. The unusual behaviour of a substantial fraction of aortic baroreceptors below Pth accounts for the J-shaped response curve of the whole ADN. We suggest that fibres that fire during diastole at pressures below Pth may have sensory endings close to the origin of the left subclavian artery. As a consequence of this anatomical location, low pressures can impose strain on these receptors, which is then relieved by the systolic pulse |
en |
dc.publisher |
The Physiological Society of Japan and Springer |
en |
dc.relation.ispartofseries |
Journal of Physiological Sciences |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.
Details obtained from http://www.sherpa.ac.uk/romeo/issn/1880-6546/ |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.title |
The relationship between aortic baroreceptor activity and arterial pressure is not monotonic |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1007/s12576-011-0132-4 |
en |
pubs.begin-page |
151 |
en |
pubs.volume |
61 |
en |
dc.rights.holder |
Copyright: The Physiological Society of Japan and Springer-Verlag |
en |
dc.identifier.pmid |
21240644 |
en |
pubs.end-page |
160 |
en |
pubs.publication-status |
Submitted |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
175985 |
en |
pubs.org-id |
Medical and Health Sciences |
en |
pubs.org-id |
Medical Sciences |
en |
pubs.org-id |
Physiology Division |
en |
pubs.record-created-at-source-date |
2010-11-16 |
en |
pubs.dimensions-id |
21240644 |
en |