Document Detail


Limb venous tone and responsiveness in hypertensive humans.
MedLine Citation:
PMID:  18635875     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Hypertensive (HTN) animal models demonstrate lower venous compliance as well as increased venous tone and responsiveness compared with normotensive (NTN) controls. However, the extent to which findings in experimental animals can be extended to humans is unknown. Forearm and calf venous compliance were quantified in 9 NTN (23 +/- 1 yr) and 9 HTN (24 +/- 1 yr) men at baseline, after administration of nitroglycerin (NTG), during a cold pressor test (CP), and post-handgrip exercise ischemia (PEI). Individual pressure-volume relationships from a cuff deflation protocol (1 mmHg/s) were modeled with a quadratic regression. Regression parameters beta(1) and beta(2) were used to calculate compliance. A one-way ANOVA was used to compare the beta parameters and a repeated-measures ANOVA was used to compare volumes across all pressures (between groups at baseline and within groups during perturbations). Limb venous compliance was similar between groups (forearm: NTN beta(1) = 0.11 +/- 0.01 and beta(2) = -0.00097 +/- 0.0001, HTN beta(1) = 0.10 +/- 0.01 and beta(2) = -0.00088 +/- 0.0001; calf: NTN beta(1) = 0.12 +/- 0.01 and beta(2) = -0.00102 +/- 0.0001, HTN beta(1) = 0.11 +/- 0.01 and beta(2) = -0.00090 +/- 0.0001). However, at baseline, volume across all pressures (i.e., capacitance) was lower in the forearm (P < or = 0.01) and tended to be lower in the calf (P = 0.08) in HTN subjects. Venous compliance was not altered by any perturbation in either group. Forearm volume was increased during NTG in HTN subjects only. While venous compliance was similar between NTN and HTN adults, HTN adults have lower forearm venous capacitance (volume) which is increased with NTG. These data suggest that young HTN adults may have augmented venous smooth muscle tone compared with NTN controls.
Authors:
Erin P Delaney; Colin N Young; Angela Disabatino; Michael E Stillabower; William B Farquhar
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2008-07-17
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  105     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-09     Completed Date:  2008-10-03     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:  894-901     Citation Subset:  IM    
Affiliation:
Department of Health, Nutrition and Exercise Sciences, University of Delaware, Newark, DE 19716, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Pressure
Blood Volume
Case-Control Studies
Cold Temperature
Compliance
Forearm / blood supply*
Hand Strength
Humans
Hypertension / physiopathology*
Ischemia / physiopathology
Leg / blood supply*
Male
Muscle, Smooth, Vascular / drug effects,  physiopathology*
Nitroglycerin / administration & dosage
Sympathetic Nervous System / physiopathology
Vascular Capacitance*
Vasodilator Agents / administration & dosage
Veins / physiopathology
Venous Pressure
Grant Support
ID/Acronym/Agency:
R03-AG-23836/AG/NIA NIH HHS
Chemical
Reg. No./Substance:
0/Vasodilator Agents; 55-63-0/Nitroglycerin
Comments/Corrections

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