Contribution of insulin-stimulated glucose uptake and basal hepatic insulin sensitivity to surrogate measures of insulin sensitivity - PubMed (original) (raw)
Multicenter Study
. 2004 Sep;27(9):2204-10.
doi: 10.2337/diacare.27.9.2204.
Affiliations
- PMID: 15333485
- DOI: 10.2337/diacare.27.9.2204
Multicenter Study
Contribution of insulin-stimulated glucose uptake and basal hepatic insulin sensitivity to surrogate measures of insulin sensitivity
Devjit Tripathy et al. Diabetes Care. 2004 Sep.
Abstract
Objective: The goal of this study was to evaluate the performance of surrogate measures of insulin sensitivity and insulin secretion.
Research design and methods: The homeostasis model assessment (HOMA) of insulin resistance (IR) and the insulin sensitivity index (S(i)) from oral glucose tolerance test (OGTT) were compared with the M value from a hyperinsulinemic-euglycemic clamp in 467 subjects with various degrees of glucose tolerance. Endogenous glucose production (EGP) and hepatic insulin sensitivity were determined in a subset (n = 143). Insulin secretion was estimated as the HOMA beta-cell index and as the insulinogenic index from the first 30 min of the OGTT (I/G30) and compared with the first-phase insulin response (FPIR) to an intravenous glucose tolerance test (n = 218).
Results: The M value correlated with the HOMA-IR (r = -0.591, P < 0.0001) and the S(i) (r = 0.533, P < 0.0001) indexes in the total study group. HOMA-IR correlated with basal EGP in the total study group (r = 0.378, P < 0.0005) and in subjects with diabetes (r = 0.330, P = 0.01). However, neither HOMA-IR nor S(i) correlated significantly with the M value in subjects with impaired fasting glucose (IFG) (r = -0.108, P = 0.5; r = 0.01, P = 0.9) or IFG/impaired glucose tolerance (IGT) (r = -0.167, P = 0.4; r = 0.09, P = 0.6). The HOMA-IR correlated with hepatic insulin sensitivity in the whole study group (r = -0.395, P < 0.005) as well as in the IFG/IGT subgroup (r = -0.634, P = 0.002) and in the diabetic subgroup (r = -0.348, P = 0.008). In subjects with IFG/IGT, hepatic insulin sensitivity was the most important determinant of HOMA-IR, explaining 40% of its variation. The HOMA beta-cell index showed a weak correlation with FPIR in the whole study group (r = 0.294, P = 0.001) but not in the subgroups. In contrast, the I/G30 correlated with FPIR in the whole study group (r = 0.472, P < 0.0005) and in the IFG/IGT subgroup (r = 0.493, P < 0.005).
Conclusions: HOMA-IR is dependent upon both peripheral and hepatic insulin sensitivity, the contribution of which differs between subjects with normal and elevated fasting glucose concentrations. These discrepancies develop as a consequence of a nonparallel deterioration of the variables included in the equations with worsening of glucose tolerance.
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