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Articles by A. Volund
Total Records ( 2 ) for A. Volund
  L. P. Sorensen , B. Brock , A. Mengel , J. Rungby , N. Moller , S. Nielsen , A. Volund and O. Schmitz
  Aims Two long-acting insulin analogues, insulin glargine and insulin detemir, have been developed as alternatives to neutral protamine Hagedorn (NPH) insulin, which has been the preferred basal insulin preparation for decades. The aim was to directly compare the pharmacodynamic properties of the long-acting insulin analogues and NPH insulin after a single subcutaneous injection.
Methods The study was conducted as a double-blind, controlled, three-arm, crossover study including 10 healthy lean male volunteers. On three different occasions, each subject was challenged with 0.4 U kg−1 of either insulin glargine, insulin detemir or NPH insulin. Plasma glucose was maintained at 0.3 mmol l−1 below fasting level by glucose clamping for 24 h. C-peptide, insulin, free fatty acids (FFAs) and counter regulatory hormones were measured throughout the clamp period, whereas endogenous glucose release (EGR) was assessed by isotope dilution technique (3-3H-glucose).
Results The mean glucose infusion rate (GIR)–time profiles revealed no significant differences between the three preparations in the primary endpoints: Maximal GIR of approximately 3.4 mg kg−1 min−1 (P = 0.68), time to maximal GIR of approximately 10 h (TRmax) (P = 0.35) and area under the GIR curve (GIRAUC) (P = 0.81). Compared with the other insulin preparations, EGR (see above)was lower for insulin detemir at the beginning of the clamp period (330–360 min) (P = 0.007) while GIR was lower (P = 0.005) and FFA concentrations were higher (P = 0.005) during the last 4 h of the clamp.
Conclusions In this experimental design, only minor pharmacodynamic differences were demonstrated between insulin detemir, insulin glargine and NPH insulin.
  P. V. Hojberg , T. Vilsboll , M. Zander , F. K. Knop , T. Krarup , A. Volund , J. J. Holst and S. Madsbad
  Objective   The aim of the present study was to investigate whether 4 weeks of near-normalization of blood glucose (BG) improves incretin hormone secretion and pancreatic B-cell function during a mixed meal.

Research design and methods   Nine patients with Type 2 diabetes in poor glycaemic control [glycated haemoglobin (HbA1c) 8.0 ± 0.4%] were investigated before and after 4 weeks of near-normalization of BG (mean BG 6.4 ± 0.3 mmol/l) using insulin treatment. HbA1c after insulin treatment was 6.6 ± 0.3%. For comparison, nine healthy control subjects were also studied. Postprandial glucagon-like peptide 1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) incremental responses were assessed during a mixed meal test. Fasting and postprandial pancreatic B-cell function was determined from calculations of insulin secretion rates in relation to plasma glucose.

Results   There was no difference in IAUCtotalGLP-1 or in IAUCtotalGIP between the two experimental days. B-cell sensitivity to glucose (insulinogenic index) did not differ before and after insulin treatment in the fasting state (0.21 ± 0.17 vs. 0.25 ± 0.10 pmol kg−1 min−1/mmol l−1), but improved significantly during the first 30 min after start of the meal (0.28 ± 0.07 vs. 0.46 ± 0.06 pmol kg−1 min−1/mmol l−1) and during the following 4 h (0.34 ± 0.09 vs. 0.56 ± 0.07 pmol kg−1 min−1/ mmol l−1). The B-cell responsiveness to changes in plasma glucose, expressed as the slope of the linear relationship between the insulin secretion rate and the concomitant plasma glucose increased from 0.59 ± 0.16 to 0.94 ± 0.13 pmol kg−1 min−1/ mmol l−1 (P < 0.07).

Conclusions   Four weeks of near-normalization of BG had no effect on postprandial secretion of incretin hormones. Nevertheless, several parameters of meal-induced insulin secretion improved after insulin treatment.

 
 
 
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