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  • 1
    Electronic Resource
    Electronic Resource
    Hypertriglyceridaemia in subjects with normal and abnormal glucose tolerance: relative contributions of insulin secretion, insulin resistance and suppression of plasma non-esterified fatty acids (1994)
    Springer
    Diabetologia 37 (1994), S. 889-896 
    Details
    ISSN: 1432-0428
    Keywords: Non-insulin-dependent diabetes mellitus ; impaired glucose tolerance ; hypertriglyceridaemia ; hyperinsulinaemia ; non-esterified fatty acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Although plasma insulin and triglyceride concentrations are positively correlated in many studies, the relationships between insulin resistance, insulin secretion and hypertriglyceridaemia remain unclear. To study these associations, subjects between the ages of 40 and 64 were randomly selected from a general practice register and invited to attend for a standard oral glucose tolerance test for measurement of insulin, triglyceride and non-esterified fatty acid concentrations. The study comprised 1122 subjects who were not previously known to have diabetes and who completed the test. Using the World Health Organisation criteria, 51 subjects were classified to have non-insulin-dependent diabetes mellitus, 188 had impaired glucose tolerance and 883 subjects had normal glucose tolerance. Triglyceride concentrations in subjects with glucose intolerance were elevated compared to those in control subjects, even after adjustment for age, obesity and gender (p〈0.001 for subjects with diabetes and p〈0.01 for those with impaired glucose tolerance compared to normal subjects). In separate multiple regression analyses for males and females, the most important determinants of the plasma triglyceride concentration were the area under the non-esterified fatty acid suppression curve (p〈0.001 in both genders) and the waist-hip ratio (p〈0.001 for men and 〈0.01 for women). The fasting insulin concentration was independently associated with triglyceride concentration in women only (p〈0.01). The most important determinant of the area under the non-esterified fatty acid suppression curve in men was the 30-min insulin increment, a measure of insulin secretion, (p〈0.001) whereas for women age (p〈0.001) and the body mass index (p〈0.01) were the most important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400944
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hypertriglyceridaemia in subjects with normal and abnormal glucose tolerance: relative contributions of insulin secretion, insulin resistance and suppression of plasma non-esterified fatty acids (1994)
    Springer
    Diabetologia 37 (1994), S. 889-896 
    Details
    ISSN: 1432-0428
    Keywords: Key words Non-insulin-dependent diabetes mellitus ; impaired glucose tolerance ; hypertriglyceridaemia ; hyperinsulinaemia ; non-esterified fatty acid.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Although plasma insulin and triglyceride concentrations are positively correlated in many studies, the relationships between insulin resistance, insulin secretion and hypertriglyceridaemia remain unclear. To study these associations, subjects between the ages of 40 and 64 were randomly selected from a general practice register and invited to attend for a standard oral glucose tolerance test for measurement of insulin, triglyceride and non-esterified fatty acid concentrations. The study comprised 1122 subjects who were not previously known to have diabetes and who completed the test. Using the World Health Organisation criteria, 51 subjects were classified to have non-insulin-dependent diabetes mellitus, 188 had impaired glucose tolerance and 883 subjects had normal glucose tolerance. Triglyceride concentrations in subjects with glucose intolerance were elevated compared to those in control subjects, even after adjustment for age, obesity and gender (p 〈 0.001 for subjects with diabetes and p 〈 0.01 for those with impaired glucose tolerance compared to normal subjects). In separate multiple regression analyses for males and females, the most important determinants of the plasma triglyceride concentration were the area under the non-esterified fatty acid suppression curve (p 〈 0.001 in both genders) and the waist-hip ratio (p 〈 0.001 for men and 〈 0.01 for women). The fasting insulin concentration was independently associated with triglyceride concentration in women only (p 〈 0.01). The most important determinant of the area under the non-esterified fatty acid suppression curve in men was the 30-min insulin increment, a measure of insulin secretion, (p 〈 0.001) whereas for women age (p 〈 0.001) and the body mass index (p 〈 0.01) were the most important. [Diabetologia (1994) 37: 889–896]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400944
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Assessment of proinsulin's effects on intermediary metabolism using the forearm technique in normal man (1993)
    Springer
    Acta diabetologica 30 (1993), S. 29-35 
    Details
    ISSN: 1432-5233
    Keywords: Forearm ; Lactate ; Man ; Proinsulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have compared the effects of human proinsulin and insulin on forearm metabolism. Seven normal, non-obese subjects were infused with 386 pmol/kg per hour of proinsulin and 180 pmol/kg per hour of insulin using the euglycaemic clamp technique. Glucose appearance and utilization rates were quantified using a primed continuous infusion of [6′,6′-2H2]glucose. Mean blood glucose was 4.1±0.1 and 4.1±0.2 mmol/l during proinsulin and insulin infusions respectively. Basal insulin concentrations increased from 0.02±0.01 to 0.25±0.03 nmol/l. The proinsulin infusion was chosen to give steady-state levels approximately 20-fold higher on a molar basis than those of insulin, based on previous findings that proinsulin has only 5% the biological potency of insulin. Basal proinsulin concentrations increased from 0.003 to 5.4±0.3 nmol/l. Hepatic glucose production was suppressed similarly during the last hour of each hormone infusion: 0.07±0.16 (proinsulin, P), and 0.01±0.13 (insulin, I) mg/kg per minute. Glucose disposal, however, was significantly increased during the final hour of the insulin infusion: 4.7±0.4 (I) and 3.4±0.2 (P) mg/kg per minute (P=0.025). Net forearm glucose uptake (FGU) increased by a greater amount during insulin compared with proinsulin infusion: 1.44±0.02 (I) and 0.71±0.01 (P) μmol/100 ml forearm per minute (P〈0.02). There was a small but significant net drop in arterialized blood lactate and pyruvate concentrations during proinsulin compared with insulin infusion: lactate −43±29 (P) and +63±35 (I) μmol/l (P〈0.01); pyruvate −8±3 (P) and +6±2 (I) μmol/l (P〈0.02). Arterialized blood alanine concentrations were similar during both series of hormone infusions. Forearm production and arterialized concentrations of glycerol were suppressed by equal amounts during the last hour of each hormone infusion. Despite greater FGU during insulin infusion, forearm production of lactate, pyruvate and alanine were similar during the last hour of each glucose clamp. These results indicate that in overnight fasted normal man: (1) proinsulin may have a preferential effect on the liver compared with muscle in terms of glucose handling; (2) proinsulin is less effective in stimulating FGU than is insulin; (3) from calculation of carbon flux across the forearm, proportionally less glucose was oxidized or stored during infusion of proinsulin compared with insulin; (4) proinsulin has similar effects on forearm lipolysis compared with insulin; (5) proinsulin may have a differential effect on splanchnic lactate metabolism compared with insulin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572871
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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