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Surrogate measures of insulin sensitivity vs the hyperinsulinaemic-euglycaemic clamp: a meta-analysis
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin.
Department of Clinical Sciences Lund, Lund University, Lund, Sweden.
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin.
2014 (Engelska)Ingår i: Diabetologia, ISSN 0012-186X, E-ISSN 1432-0428, Vol. 57, nr 9, s. 1781-1788Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Aims/hypothesis We aimed to identify which surrogate index of insulin sensitivity has the strongest correlation with the reference measurement, the hyperinsulinaemic-euglycaemic clamp (HEC), to determine which surrogate measure should be recommended for use in large-scale studies. Methods A literature search (1979-2012) was conducted to retrieve all articles reporting bivariate correlations between the HEC and surrogate measures of insulin sensitivity (in fasting samples or during the OGTT). We performed a random effects meta-analysis for each surrogate measure to integrate the correlation coefficients of the different studies. Results The OGTT-based surrogate measures with the strongest pooled correlations (r) to the HEC were the Stumvoll metabolic clearance rate (Stumvoll MCR; r=0.70 [95% CI 0.61, 0.77], n=5), oral glucose insulin sensitivity (OGIS; r=0.70 [0.57, 0.80], n=6), the Matsuda index (r=0.67 [0.61, 0.73], n=19), the Stumvoll insulin sensitivity index (Stumvoll ISI; r=0.67 [0.60, 0.72], n=8) and the Gutt index (r=0.65 [0.60, 0.69], n=6). The fasting surrogate indices that correlated most strongly with the HEC and had narrow 95% CIs were the revised QUICKI (r=0.68 [0.58, 0.77], n=7), the QUICKI (r=0.61 [0.55, 0.65], n=35), the log HOMA-IR (r=-0.60 [-0.66, -0.53], n=22) and the computer generated HOMA of insulin sensitivity (HOMA-%S; r=0.57 [0.46, 0.67], n=5). Conclusions/interpretation The revised QUICKI fasting surrogate measure appears to be as good as the OGTT-based Stumvoll MCR, OGIS, Matsuda, Stumvoll ISI and Gutt indices for estimating insulin sensitivity. It can therefore be recommended as the most appropriate index for use in large-scale clinical studies.

Ort, förlag, år, upplaga, sidor
Springer, 2014. Vol. 57, nr 9, s. 1781-1788
Nyckelord [en]
Glucose, Hyperinsulinaemic-euglycaemic clamp, Insulin, Insulin sensitivity, Meta-analysis, Surrogate markers
Nationell ämneskategori
Endokrinologi och diabetes
Identifikatorer
URN: urn:nbn:se:umu:diva-92899DOI: 10.1007/s00125-014-3285-xISI: 000340050800006OAI: oai:DiVA.org:umu-92899DiVA, id: diva2:748205
Tillgänglig från: 2014-09-18 Skapad: 2014-09-09 Senast uppdaterad: 2019-03-18Bibliografiskt granskad
Ingår i avhandling
1. Effects of a Paleolithic diet and exercise on liver fat, muscle fat and insulin sensitivity
Öppna denna publikation i ny flik eller fönster >>Effects of a Paleolithic diet and exercise on liver fat, muscle fat and insulin sensitivity
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Finding ways to reduce risk for obesity-related disorders, including type 2 diabetes and cardiovascular disease, is important. Such approaches can include lifestyle interventions by diet and exercise. Our ancestors in the Paleolithic Era ate a diet based on vegetables, fruit, berries, lean meat, fish, seafood, nuts and eggs. Cereals, dairy products and legumes were not a significant part of the diet before the agricultural revolution, and neither were added sugar or salt. Furthermore, our ancestors were much more physically active compared to the average Western population.

Contemporary hunter-gatherers like the Kitava Islanders and the Greenlandic Inuit eat a diet similar to that of the Paleolithic Era and have a strikingly low frequency of cardiovascular events. Detailed studies of the metabolic effects of the Paleolithic diet, with and without exercise, are therefore warranted.

Impaired insulin sensitivity is a key factor in the development of type 2 diabetes and cardiovascular disease. In this thesis, insulin sensitivity was measured with the gold-standard examination – the hyperinsulinemic– euglycemic clamp – and also with fasting blood samples and the oral glucose tolerance test. We found the fasting index Revised QUICKI to be the best choice if the time-consuming gold-standard examination is not feasible. However, to distinguish insulin sensitivity of different tissues like skeletal muscle, liver and adipose tissue, the hyperinsulinemic–euglycemic clamp is preferred.

In our studies, the Paleolithic diet improved cardiovascular risk factors like overweight, insulin sensitivity, liver fat, triglycerides and blood pressure in obese, postmenopausal women. All study participants decreased liver fat when eating a Paleolithic diet. Six months of Paleolithic diet improved weight, liver fat and triglycerides significantly more than a conventional low-fat diet in obese, postmenopausal women. It was difficult for the women to remain adherent to the Paleolithic diet for 2 years, however, and most cardiovascular risk factors showed some degree of deterioration between 6 and 24 months. In individuals with type 2 diabetes, a Paleolithic diet for 12 weeks improved weight, insulin sensitivity, HbA1c, triglycerides and blood pressure. Exercise training did not improve these cardiovascular risk factors beyond the changes observed with the Paleolithic diet alone. The 12-week Paleolithic diet intervention also reduced muscle fat and liver fat, but exercise training reversed this effect.

A Paleolithic diet has strong effects on fat content in liver and muscle and on insulin sensitivity. Our present results indicate reduced metabolic flexibility in the fat content in liver and muscle tissue among patient with type 2 diabetes, which may improve through diet and exercise intervention. 

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2016. s. 73
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 1839
Nyckelord
type 2 diabetes, liver fat, Paleolithic diet, exercise training, insulin sensitivity, overweight, intramyocellular lipid content
Nationell ämneskategori
Endokrinologi och diabetes
Identifikatorer
urn:nbn:se:umu:diva-126189 (URN)978-91-7601-548-3 (ISBN)
Disputation
2016-10-28, Hörsal 933, trapphus B, Norrlands universitetssjukhus, Umeå, 09:00 (Svenska)
Opponent
Handledare
Tillgänglig från: 2016-10-07 Skapad: 2016-10-03 Senast uppdaterad: 2018-08-27Bibliografiskt granskad

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