| Cardiovascular correlates of insulin resistance in normotensive and hypertensive African Americans. | |
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MedLine Citation:
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PMID: 20846700 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Insulin resistance (IR) is associated with obesity and predisposes to diabetes mellitus (DM) and cardiovascular disease. The purpose of this study is to determine if IR is related to cardiovascular function independent of DM or hypertension among African Americans (AA). Four hundred sixty-two nondiabetic AA (50% hypertensive and 51% women) were studied on an inpatient General Clinical Research Center. Measurements included anthropometrics and 24-hour blood pressure (BP), heart rate (HR), fasting blood glucose, plasma aldosterone, and insulin. Stroke volume (SV) and cardiac output (CO) were measured by impedance plethysmography; peripheral vascular resistance (PVRI) and vascular compliance indices (VCI) were computed. These measurements were also obtained in response to mental (computerized math testing) and pharmacologic (graded norepinephrine infusion) stress. Insulin resistance was calculated using the homeostasis model assessment (HOMA-IR). SV, CO, and VCI decreased with increasing HOMA-IR, whereas HR and PVRI increased. Overall, BP, HR, and PVRI were positively correlated with HOMA-IR (P < .01); and SV index, cardiac index, and VCI were negatively correlated with HOMA-IR (P < .0001). The correlations persisted after adjustment for BP, age, sex, plasma aldosterone, total cholesterol, or low-density lipoprotein and high-density lipoprotein cholesterol. In addition, multiple linear regression analyses showed that HOMA-IR contributes to the maximum variability of all the hemodynamic variables. Blood pressure responses to math stress and norepinephrine infusion did not correlate with HOMA-IR. Unrelated to DM and BP, IR is associated with increased PVRI and decreased CO in AA. These observations suggest that an exclusive focus on effects of IR on DM or BP may ignore independent pathophysiologic contributions of IR to cardiovascular disease. |
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Authors:
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Srividya Kidambi; Jane M Kotchen; Shanthi Krishnaswami; Clarence E Grim; Theodore A Kotchen |
Publication Detail:
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Type: Journal Article Date: 2010-09-16 |
Journal Detail:
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Title: Metabolism: clinical and experimental Volume: 60 ISSN: 1532-8600 ISO Abbreviation: Metab. Clin. Exp. Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-05-17 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375267 Medline TA: Metabolism Country: United States |
Other Details:
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Languages: eng Pagination: 835-42 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
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Medical College of Wisconsin, Milwaukee, WI 53226, USA; Clement J. Zablocki VA Medical Center, Milwaukee, WI 53295, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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