Peripheral and hepatic insulin sensitivity in healthy elderly human subjects.

Abstract:

:Insulin resistance has been reported in normal ageing but discrepancies between such studies may be related to compounding factors such as body composition and exercise patterns. We employed a two-step hyperinsulinaemic euglycaemic clamp to assess peripheral and hepatic tissue insulin sensitivity and glucose recycling in 13 elderly (E) and 14 young (Y) healthy subjects controlling for the above factors. There was no difference in basal hepatic glucose production (E: 2.36 +/- 0.06, Y: 2.47 +/- 0.1 mg kg-1 min-1; P = 0.4). At step 1 (insulin infusion 15 mU kg-1 h-1) glucose turnover was similar (E: 2.65 +/- 0.13, Y: 2.88 +/- 0.22 mg kg-1 min-1; P = 0.4) but hepatic glucose production was lower in the elderly group (0.20 +/- 0.16 vs 0.64 +/- 0.10 mg kg-1 min-1; P = 0.03). At step 2 (insulin infusion 50 mU kg-1 h-1) glucose turnover was similar (E: 7.60 +/- 0.24, Y: 8.05 +/- 0.34 mg kg-1 min-1; P = 0.3) and hepatic glucose production was equal but negative (E: -1.35 +/- 0.18, Y: -1.34 +/- 0.22 mg kg-1 min-1; P = 0.9). Glucose recycling did not differ between the groups at any stage. Similar serum insulin levels were achieved in both groups at each step. Decreased glucose tolerance was confirmed in E with a higher 2 h blood glucose after an OGTT (5.3 +/- 0.4 vs 4.1 +/- 0.3 mmol l-1; P = 0.03) but incremental insulin response was similar (E: 3236 +/- 289, Y: 3586 +/- 463 mU l-1 min-1; P = 0.5). We conclude that changes in hepatic tissue insulin sensitivity do not cause the deterioration in glucose tolerance observed with age. A small reduction in both peripheral tissue insulin sensitivity and late insulin secretion may be responsible.

journal_name

Eur J Clin Invest

authors

Broughton DL,James OW,Alberti KG,Taylor R

doi

10.1111/j.1365-2362.1991.tb01352.x

subject

Has Abstract

pub_date

1991-02-01 00:00:00

pages

13-21

issue

1

eissn

0014-2972

issn

1365-2362

journal_volume

21

pub_type

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