Influence of Increasing BMI on Insulin Sensitivity and Secretion in Normotolerant Men and Women of a Wide Age Span
Influence of Increasing BMI on Insulin Sensitivity and Secretion in Normotolerant Men and Women of a Wide Age Span
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DOI：
10.1038/oby.2011.384
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发表时间：
2012-10-01
期刊：
影响因子：
6.9
通讯作者：
Pacini, Giovanni
中科院分区：
文献类型：
--
作者：
Kautzky-Willer, Alexandra;Brazzale, Alessandra R.;Pacini, Giovanni
The impact of sex and age on glucose metabolism in the development of overweight/obesity is a matter of debate. We hypothesized that insulin sensitivity (IS) and beta-cell function (BF) in a normal white population will differ between males and females and aimed to evaluate the possible effects of BMI and age on metabolic parameters of both sexes. This study is a cross-sectional analysis of the general community. IS was measured with quantitative insulin sensitivity check index (QUICKI) and oral glucose insulin sensitivity (OGIS) and BF with the insulinogenic index during 75-g 2-h oral glucose-tolerance tests (OGTTs). We studied 611 females and 361 males with normal glycemia according to both fasting and 2-h glucose (85 +/- 0.3 mg/dl (means +/- SE) in females and 89 +/- 0.4 in males (P < 0.0001), and 93 +/- 1 in females and 89 +/- 1 in males (P = 0.005), respectively). Females were younger (37 +/- 1 years) than males (40 +/- 1, P < 0.0001), but no difference was found in mean BMI (BMI = 25.8 +/- 0.2 kg/m(2) in both). Student's two-sample t-test was used for simple comparison between and within genders, multiple linear regressions to account for covariates. During the OGTT, females had lower glucose (area under the curve (AUC) 133 +/- 1 mg/ml.2 h vs. 148 +/- 2; P < 0.00001), while insulinemia was comparable (AUC 5.3 +/- 0.1 mU/ml.2 h vs. 5.7 +/- 0.2, P = 0.15). IS remained higher in females (473 +/- 3 ml/min/m(2) vs. 454 +/- 3, P < 0.0001) also after having accounted for age and BMI (P = 0.015). No difference was observed in fasting insulin or BF. However, BF increased by 46% with BMI and when accounting for age and BMI, BF of females was significantly higher (P < 0.0001). Because IS and BF are higher in females than in males, sex should be considered in metabolic studies and overweight/obese populations.
