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The impact of age on vascular smooth muscle function in humans

Montero, D and Pierce, GL and Stehouwer, CDA and Padilla, J and Thijssen, DHJ (2015) The impact of age on vascular smooth muscle function in humans. JOURNAL OF HYPERTENSION, 33 (3). pp. 445-453. ISSN 0263-6352

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Abstract

Aim: Advanced age is associated with vascular endothelial dysfunction, characterized by reductions in the endothelium-dependent vasodilation of the conduit and resistance arteries, in part, from decreased nitric oxide bioavailability. Although vascular smooth muscle function (SMF), assessed by responsiveness to an exogenous nitric oxide donor, is typically reported to be intact, many of these studies are limited by a small sample size. Therefore, the purpose of this meta-analysis is to systematically review and determine whether vascular SMF is different between older versus young healthy individuals.

Design: We conducted a systematic search of MEDLINE, Cochrane and Scopus, since their inceptions until January 2014, for articles evaluating SMF in the brachial artery and/or resistance arteries (BASMF and RASMF, respectively), as assessed by the endothelium-independent vasodilator response to exogenous nitric oxide donors in older (≥60 years) and young (<30 years) groups of healthy individuals. Meta-analyses were performed to compare the mean difference in BASMF and the standardized mean difference in RASMF between older and young groups. Subgroup analyses were performed to identify sources of heterogeneity.

Results: Fifteen studies assessing BASMF and 20 studies assessing RASMF were included, comprising 550 older and 516 young healthy individuals. After data pooling, BASMF and RASMF were lower in older compared with the young groups (mean difference = −1.89%, P = 0.04; standardized mean difference = −0.46, P = 0.0008, respectively). Significant heterogeneity was observed in the BASMF (I2 = 74%, P < 0.00001) and the RASMF (I2 = 57%, P = 0.0008) meta-analyses. Subgroup analyses revealed that studies with (predominantly) men showed similar SMF responses between the older and the young groups.

Conclusion: On the basis of the current published studies, vascular SMF is reduced in conduit and resistance arteries of otherwise healthy older individuals, particularly in women.

Item Type: Article
Uncontrolled Keywords: 1103 Clinical Sciences, 1102 Cardiovascular Medicine And Haematology
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Lippincott, Williams and Wilkins
Related URLs:
Date Deposited: 22 Jan 2016 11:27
Last Modified: 01 Mar 2016 00:50
DOI or Identification number: 10.1097/HJH.0000000000000446
URI: http://researchonline.ljmu.ac.uk/id/eprint/2753

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