Abstract
The aim of the study was to elucidate the role of hyperinsulinaemia/insulin resistance in hypertension of lean postmenopausal women. Twenty-four women with essential hypertension (systolic/diastolic ⩾140/90 mm Hg) and a body mass index (BMI) less than 26 kg/m2 not receiving antihypertensive treatment or who had been without treatment for a 4-week washout period, and 10 normotensive postmenopausal weight- and aged-matched controls were compared. Both groups were not receiving hormone replacement therapy. Hip and waist circumferences were measured and waist/hip ratios were calculated. Casual blood pressure was measured in triplicate. Neither the fasting plasma glucose nor serum insulin levels in hypertensive women and normotensives differed significantly. During 2 h oral glucose (75 g)-tolerance test the mean plasma glucose levels after 30 min (172.5 ± 40.24 mg/dl vs 143.67 ± 20.16 mg/dl), 60 min (134.88 ± 38.78 mg/dl vs 112.33 ± 5.44 mg/dl) and 120 min (116.08 ± 26.65 mg/dl vs 95.56 ± 20.17 mg/dl) were significantly higher in hypertensives than that for normotensives (P < 0.05 for all three comparisons). The mean serum insulin levels of hypertensive women were significantly higher than that in normotensives after 15 min (92.04 ± 59.90 μU/ml vs 54.89 ± 33.67 μU/ml) and 120 min (49.63 ± 44.45 μU/ml vs 19.22 ± 24.10 μU/ml; P< 0.05 for both comparisons). The mean serum insulin: plasma glucose ratio for hypertensive women was significantly higher than that for normotensives after 15 min (0.596 ± 0.46 vs 0.359 ± 0.20 μU/mg), 60 min (0.406 ± 0.30 vs0.329 ± 0.25 μU/mg) and 120 min (0.436 ± 0.35 vs 0.205 ± 0.26 μU/mg) (P < 0.05 for all three comparisons). Significant correlations were observed between the daytime period and 24-h average ambulatory systolic blood pressure and the area under the serum insulin curve (r = 0.41 and 0.36, respectively). For non-dippers we found higher fasting insulinaemias but the AUCinsulin did not differ. Plasma glucose levels did not differ either during fasting or during OGTT (AUCglucose). Insulinogenic index was higher in dippers than in non-dippers. We conclude that in lean, postmenopausal hypertensive women insulin resistance is increased compared with age- and weight-matched normotensive women. Also, hyperinsulinaemia correlates with ambulatory systolic blood pressure. Thus, insulin resistance may possibly be involved as a pathogenetic factor in lean, postmenopausal hypertensive women.
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Feldstein, C., Akopian, M., Renauld, A. et al. Insulin resistance and hypertension in postmenopausal women. J Hum Hypertens 16 (Suppl 1), S145–S150 (2002). https://doi.org/10.1038/sj.jhh.1001362
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DOI: https://doi.org/10.1038/sj.jhh.1001362