BACKGROUND: The serum level of 25-hydroxyvitamin D deficiency has long been suspected as a risk factor for glucose intolerance and perhaps 1,25-dihydroxyvitamin D has a role in the regulation of insulin secretion. This study investigates the relation between 25-hydroxyvitamin D concentrations and insulin resistance in pregnant women. METHODS: A cross-sectional study was conducted on 741 pregnant women referred to five educating hospital clinics. Universal screening was performed with a GCT-50 g, and those with plasma glucose levels > pr = 7.2 mmol/L were diagnosed as GDM if they had an impaired GTT-100 g based on Carpenter and Coustan criteria. The levels of insulin and C-peptide were measured during OGTT-100 g test. The homeostasis model assessment index (HOMA) equation was used as the insulin resistance index. The concentrations of 25-hydroxyvitamin D, and PTH were also measured. RESULTS: Total prevalence of vitamin D deficiency (<25 nmol/L) was found in 70.6% of pregnant women. Prevalence of severe vitamin D deficiency (<12.5) in GDM patients was higher than in normoglycaemic pregnancies. The regression model revealed a strong correlation between the HOMA index and serum levels of vitamin D. CONCLUSIONS: These results show that a positive correlation of 25(OH) vitamin D concentrations with insulin sensitivity and vitamin D deficiency could be a confirmative sign of insulin resistance. 2007 John Wiley & Sons, Ltd
BACKGROUND: The serum level of 25-hydroxyvitamin D deficiency has long been suspected as a risk factor for glucose intolerance and perhaps 1,25-dihydroxyvitamin D has a role in the regulation of insulin secretion. This study investigates the relation between 25-hydroxyvitamin D concentrations and insulin resistance in pregnant women. METHODS: A cross-sectional study was conducted on 741 pregnant women referred to five educating hospital clinics. Universal screening was performed with a GCT-50 g, and those with plasma glucose levels > pr = 7.2 mmol/L were diagnosed as GDM if they had an impaired GTT-100 g based on Carpenter and Coustan criteria. The levels of insulin and C-peptide were measured during OGTT-100 g test. The homeostasis model assessment index (HOMA) equation was used as the insulin resistance index. The concentrations of 25-hydroxyvitamin D, and PTH were also measured. RESULTS: Total prevalence of vitamin D deficiency (<25 nmol/L) was found in 70.6% of pregnant women. Prevalence of severe vitamin D deficiency (<12.5) in GDM patients was higher than in normoglycaemic pregnancies. The regression model revealed a strong correlation between the HOMA index and serum levels of vitamin D. CONCLUSIONS: These results show that a positive correlation of 25(OH) vitamin D concentrations with insulin sensitivity and vitamin D deficiency could be a confirmative sign of insulin resistance. 2007 John Wiley & Sons, Ltd
Authors: Arthur M Baker; Sina Haeri; Carlos A Camargo; Alison M Stuebe; Kim A Boggess Journal: Diabetes Metab Res Rev Date: 2012-02 Impact factor: 4.876
Authors: S Karras; S A Paschou; E Kandaraki; P Anagnostis; C Annweiler; B C Tarlatzis; B W Hollis; W B Grant; D G Goulis Journal: Eur J Clin Nutr Date: 2016-03-02 Impact factor: 4.016
Authors: Jennifer Jao; Laura Freimanis; Marisa M Mussi-Pinhata; Rachel A Cohen; Jacqueline P Monteiro; Maria L Cruz; Rhoda S Sperling; Andrea Branch; George K Siberry Journal: Int J Gynaecol Obstet Date: 2015-04-11 Impact factor: 3.561