| Blood pressure variability responses to tilt are buffered by cardiac autonomic control. | |
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MedLine Citation:
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PMID: 9321834 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Variability in blood pressure (BPV) is influenced by vascular sympathetic drive as well as autonomic control of the heart. Evidence suggests that elimination of cardiac autonomic control, as measured by heart period variability (HPV), produces a reduction in BPV at rest but an increase in BPV during challenge. We recently showed that the BPV response to psychological challenge, which principally produces cardiac parasympathetic withdrawal, was inversely related to the subject's level of cardiac control. In the current study we examined the BPV response to orthostatic tilt, a sympathetic stressor. Subjects were 22 healthy men and women who differed in cardiac control due in part to differences in aerobic capacity. HPV and BPV were measured noninvasively on a beat-to-beat basis. Tilt produced significant increases in heart rate and diastolic blood pressure and a significant decrease in high frequency HPV. As predicted, changes in BPV in response to tilt were inversely related to resting HPV. Results are interpreted in terms of a model of cardiovascular control which holds that BPV originates from feedforward effects of central control of the heart, feedback effects mediated through the baroreflexes, and direct sympathetic vascular effects. |
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Authors:
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R P Sloan; R E DeMeersman; P A Shapiro; E Bagiella; D Chernikhova; J P Kuhl; A S Zion; M Paik; M M Myers |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The American journal of physiology Volume: 273 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1997 Sep |
Date Detail:
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Created Date: 1997-10-23 Completed Date: 1997-10-23 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: H1427-31 Citation Subset: IM; S |
Affiliation:
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Behavioral Medicine Program, Columbia-Presbyterian Medical Center, New York, New York, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blood Pressure* Diastole Electrocardiography* Exercise Test Female Head-Down Tilt Heart / innervation* Heart Rate* Humans Male Oxygen Consumption Posture* Respiration Systole Tilt-Table Test |
| Grant Support | |
ID/Acronym/Agency:
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M01-RR-00645/RR/NCRR NIH HHS; MH-01035/MH/NIMH NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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