Document Detail


Comparison of cardiovascular responses between lower body negative pressure and head-up tilt.
MedLine Citation:
PMID:  15761089     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To investigate local blood-flow regulation during orthostatic maneuvers, 10 healthy subjects were exposed to -20 and -40 mmHg lower body negative pressure (LBNP; each for 3 min) and to 60 degrees head-up tilt (HUT; for 5 min). Measurements were made of blood flow in the brachial (BF(brachial)) and femoral arteries (BF(femoral)) (both by the ultrasound Doppler method), heart rate (HR), mean arterial pressure (MAP), cardiac stroke volume (SV; by echocardiography), and left ventricular end-diastolic volume (LVEDV; by echocardiography). Comparable central cardiovascular responses (changes in LVEDV, SV, and MAP) were seen during LBNP and HUT. During -20 mmHg LBNP, -40 mmHg LBNP, and HUT, the following results were observed: 1) BF(brachial) decreased by 51, 57, and 41%, and BF(femoral) decreased by 40, 53, and 62%, respectively, 2) vascular resistance increased in the upper limb by 110, 147, and 85%, and in the lower limb by 76, 153, and 250%, respectively. The increases in vascular resistance were not different between the upper and lower limbs during LBNP. However, during HUT, the increase in the lower limb was much greater than that in the upper limb. These results suggest that, during orthostatic stimulation, the vascular responses in the limbs due to the cardiopulmonary and arterial baroreflexes can be strongly modulated by local mechanisms (presumably induced by gravitational effects).
Authors:
Asami Kitano; J Kevin Shoemaker; Masashi Ichinose; Hiroyuki Wada; Takeshi Nishiyasu
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-03-10
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  98     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-16     Completed Date:  2005-08-19     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2081-6     Citation Subset:  IM; S    
Affiliation:
Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba City, Ibaraki 305-8574, Japan.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adult
Baroreflex / physiology*
Blood Flow Velocity / physiology
Blood Pressure / physiology
Dizziness / physiopathology
Female
Hemostasis / physiology
Humans
Lower Body Negative Pressure / methods*
Lower Extremity / blood supply*,  physiology
Male
Posture / physiology*
Tilt-Table Test / methods*
Upper Extremity / blood supply*,  physiology
Ventricular Function, Left / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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