当前位置： SCI文献检索 > AMERICAN JOURNAL OF HYPERTENSION期刊下所有文献 > Effects of aging on the insulin actions for the glucose metabolism and renal function in normotensives and essential hypertensives.

Effects of aging on the insulin actions for the glucose metabolism and renal function in normotensives and essential hypertensives.

Abstract：

:It has been suggested that hyperinsulinemia compensating insulin resistance in glucose metabolism may be a pathogenic factor in essential hypertension. On the other hand, age-associated increases in the prevalence of glucose intolerance and hypertension are also well established. The aim of this study is to clarify the influence of aging on insulin sensitivity in glucose metabolism and on renal sodium handling under hyperinsulinemia, which may relate to high blood pressure in insulin-resistant subjects. Fifty-two normotensive subjects and 61 patients with essential hypertension were evaluated in this study. The subjects of these groups were divided into young (<40 years old) and middle-elderly (> or = 40 years old): young normotensives (Y-NT, n = 22); middle-elderly normotensives (ME- NT, n = 30); young hypertensives (Y-HT, n = 9); and middle-elderly hypertensives (ME-HT, n = 52). Using the euglycemic hyperinsulinemic glucose clamp, insulin sensitivity was assessed as M value. Just before the start and the termination of the glucose clamp, creatinine clearance (Ccr) and urinary excretion of sodium (UNaV) were measured. In addition, renal plasma flow assessed as para-aminohippuric acid clearance was also measured at the same time in several subjects; 8 Y-NT, 8 ME-NT, 3 Y-HT, and 10 ME-HT. The M value was significantly lower in ME-NT, Y-HT, and ME-HT, compared to Y-NT, although blood sugar and immunoreactive insulin levels were similar in all four groups. In normotensive subjects, there was a significant, negative correlation between age and M value. However, this correlation was not observed in hypertensive patients. UNaV decreased in ME-NT, Y-HT, and ME-HT, but not in Y-NT under hyperinsulinemia by the glucose clamp, whereas Ccr showed no significant change in any group. In all subjects, the change of UNaV (deltaUNaV) correlated significantly and positively with the M value. Renal plasma flow significantly increased under hyperinsulinemia by the glucose clamp in only Y-HT, but not in the other groups. There was a significant, positive correlation between deltaUNaV and the change of renal plasma flow under hyperinsulinemia by the glucose clamp. These results suggested that both the impairments of the insulin sensitivity and insulin-induced vasodilation at the renal artery with aging may partially contribute to age-related elevation of blood pressure through renal sodium retention by compensating hyperinsulinemia. On the other hand, it seems reasonable to assume that these abnormalities, which can contribute to high blood pressure in essential hypertension, already may exist at lower ages in essential hypertensive patients.

journal_name

Am J Hypertens

journal_title

American journal of hypertension

authors

Miyazaki Y,Hirata A,Murakami H,Fukuoka M,Agata J,Higashiura K,Masuda A,Ura N,Shimamoto K

doi

10.1016/s0895-7061(98)00113-7

subject

Has Abstract

pub_date

1998-09-01 00:00:00

pages

1056-64

issue

eissn

0895-7061

issn

1941-7225

pii

S0895-7061(98)00113-7

journal_volume

pub_type

杂志文章

在线工具

Effects of aging on the insulin actions for the glucose metabolism and renal function in normotensives and essential hypertensives.