Exp Clin Endocrinol Diabetes 2005; 113(8): 444-450
DOI: 10.1055/s-2005-865709
Article

J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York

Relationship between Metabolic Parameters, Blood Pressure, and Sympathoendocrine Function in Healthy Young Adults with Low Birth Weight

G. Weitz1 , P. Wellhoener1 , S. Heindl1 , H. L. Fehm1 , C. Dodt1
  • 1Department of Internal Medicine I, Medical University of Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
Further Information

Publication History

Received: October 19, 2004 First decision: March 22, 2005

Accepted: May 2, 2005

Publication Date:
08 September 2005 (online)

Abstract

The association between low birth weight (LBW) and elevated blood pressure has been attributed to disturbances in the endocrine and sympathetic nervous system. The present study focussed on parameters of cardiovascular and sympathetic function and on adrenocortical activity in 24 healthy subjects aged 20 - 30 years with a birth weight of less than 2500 g at term and a control group of 24 subjects with a normal birth weight (NBW; 3200 - 3700 g) who were thoroughly matched for gender, body mass index (BMI), and age. Blood pressure, heart rate, and insulin resistance (calculated according to the homeostasis model assessment) were determined. Additionally, free salivary cortisol was measured at 08 : 00 am and 11 : 00 pm. In 13 subjects of each group, muscle sympathetic nerve activity (MSNA) was measured microneurographically at rest and after baroreflex stimulation by nitroprusside (12 NBW and 9 LBW subjects). Metabolic parameters, blood pressure, and salivary cortisol did not differ between LBW and NBW subjects. MSNA was significantly lower in the LBW group. In both groups insulin resistance correlated positively with BMI and negatively with morning cortisol. In the LBW group, but not the NBW group, systolic and diastolic blood pressure correlated positively with BMI and insulin resistance, and negatively with morning salivary cortisol. A correlation between morning salivary cortisol and the MSNA was only found in NBW subjects. This positive correlation strengthened when MSNA was stimulated by nitroprusside administration. However, in the same maneuvre a negative correlation between morning salivary cortisol and MSNA was observed in the LBW group. The data indicate that insulin resistance depends on the same factors in LBW and NBW subjects. In LBW subjects the interplay between adrenocortical and sympathetic activity is altered. Furthermore, LBW subjects differ from the NBW group in their significant interrelationship between blood pressure and metabolic factors.

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Dr. Gunther Weitz

Department of Internal Medicine I
Medical University of Schleswig-Holstein
Campus Lübeck

Ratzeburger Allee 160

23538 Lübeck

Germany

Phone: + 494515002351

Fax: + 49 45 15 00 33 66

Email: gunther.weitz@ukl.uni-luebeck.de

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