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Growth Hormone Treatment of Abdominally Obese Men Reduces Abdominal Fat Mass, Improves Glucose and Lipoprotein Metabolism, and Reduces Diastolic Blood Pressure¹

Research Center for Endocrinology and Metabolism (G.J., B.-A.B.), Department of Heart and Lung Diseases (P.M., M.O., P.B.), Department of Radiology (L.L.), and Department of Medicine (K.S., L.S.), Sahlgrenska University Hospital, S-413 45 Göteborg, Sweden

Address all correspondence and requests for reprints to: Gudmundur Johannsson, M.D., Research Center for Endocrinology and Metabolism, Sahlgrenska University Hospital, S-413 45 Göteborg, Sweden. E-mail: Gudmundur.Johannsson{at}ss.gu.se

The most central findings in both GH deficiency in adults and the metabolic syndrome are abdominal/visceral obesity and insulin resistance. Abdominal obesity is associated with blunted GH secretion and low serum insulin-like growth factor-I concentrations. GH treatment in GH-deficient adults has demonstrated favorable effects on most of the features of GH deficiency in adults, but it is not known whether GH can improve some of the metabolic aberrations observed in abdominal/visceral obesity.

Thirty men, 48–66 yr old, with abdominal/visceral obesity were treated with recombinant human GH (rhGH) in a 9-month randomized, double-blind, placebo-controlled trial. The daily dose of rhGH was 9.5 µg/kg. Body fat was assessed from total body potassium, and abdominal sc and visceral adipose tissue was measured using computed tomography. The glucose disposal rate (GDR) was measured during an euglycemic, hyperinsulinemic glucose clamp.

In response to the rhGH treatment, total body fat and abdominal sc and visceral adipose tissue decreased by 9.2 ± 2.4%, 6.1 ± 3.2%, and 18.1 ± 7.6%, respectively. After an initial decrease in the GDR at 6 weeks, the GDR increased in the rhGH-treated group as compared with the placebo-treated one (P < 0.05). The mean serum concentrations of total cholesterol (P < 0.01) and triglyceride (P < 0.05) decreased, whereas blood glucose and serum insulin concentrations were unaffected by the rhGH treatment. Furthermore, diastolic blood pressure decreased and systolic blood pressure was unchanged in response to rhGH treatment.

This trial has demonstrated that GH can favorably affect some of the multiple perturbations associated with abdominal/visceral obesity. This includes a reduction in abdominal/visceral obesity, an improved insulin sensitivity, and favorable effects on lipoprotein metabolism and diastolic blood pressure.

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