Elevated fasting insulin predicts the future incidence of metabolic syndrome: a 5-year follow-up study
© Sung et al; licensee BioMed Central Ltd. 2011
Received: 19 September 2011
Accepted: 30 November 2011
Published: 30 November 2011
There is controversy about the specific pathophysiology of metabolic syndrome (MS) but several authors have argued that hyperinsulinemia is a key feature of the cluster. We aimed to assess whether the baseline insulin levels could predict the development of MS in a well characterised cohort of otherwise healthy adults who were followed over a five year period.
We identified 2, 350 Koreans subjects who did not have MS in 2003 and who were followed up in 2008. The subjects were divided into 4 groups according to the baseline quartiles of fasting insulin, and the predictors of the incidence of MS were analyzed using multivariate regression analysis.
Over the follow up period, 8.5% of the cohort developed MS. However, 16.4% of the subjects in the highest quartile of the insulin levels developed MS. In a model that included gender, age, the smoking status, the exercise level, alcohol consumption and the systolic blood pressure, the subjects in the highest quartile of the insulin levels had more than a 5 times greater risk of developing MS compared that of the subjects in the lowest quartile. This predictive importance remained significant even after correcting for all the individual features of MS.
These data suggest that high baseline fasting insulin levels are independent determinants for the future development of MS.
KeywordsMetabolic syndrome hyperinsulinemia insulin Resistance
Metabolic syndrome (MS) has received increased attention as an important epidemiological tool for predicting cardiovascular disease (CVD) and type 2 diabetes (T2DM) [1–8]. MS is a cluster of CVD and T2DM risk factors with a shared pathophysiology [2, 5, 9, 10]. Although there is still debate about insulin resistance and hyperinsulinemia being central to the clustering of these common CVD risk factors [11, 13], they have been recognized as pathophysiologic linking factors of MS [14–16]. Early and identification of those people who are most likely to develop the MS and/or its component features should lead to targeted and "tailored" intervention strategies, and particularly lifestyle modifications such as exercise and dietary changes .
So far, there have been only limited data of the relationship between the future development of MS and the baseline insulin level, which is a surrogate maker of insulin sensitivity/resistance. Thus, in this large, well characterized, cohort study of otherwise healthy subjects without T2DM or MS, we aimed to assess whether the baseline insulin levels can predict the development of MS. We hypothesized that measuring the fasting insulin in healthy subjects can predict the subsequent development of MS.
The study was approved by the institutional review board at Kangbuk Samsung Hospital. The health examination consisted of a full medical history and comprehensive blood test evaluation. The participants' height and weight were measured barefoot and in light clothing. The body mass index (BMI) was calculated as weight in kilograms divided by the height in square meters. Waist circumference was measured with the subject in the standing position and at the level of umbilicus by a single examiner. Blood pressure was measured using a standardized sphygmomanometer after 5 minutes of rest. Questionnaires were used to ascertain information regarding the frequency of exercise (none, < 1 time/week, ≥1 time/week), the smoking status (never, past, current) and the amount of alcohol consumed (both quantity and frequency). Current smoker were define as those who admitted to smoking at the interview. Grams of alcohol consumption were calculated by multiplying the frequency by the amount, as previously reported .
Laboratory examinations were obtained after an overnight fast. The fasting plasma glucose, total cholesterol (TC), triglyceride(TG), low-density lipoprotein cholesterol (LDL-C) and high density lipoprotein cholesterol (HDL-C) concentrations were measured using Bayer Reagent Packs on an automated chemistry analyzer (Advia 1650 Autoanalyzer; Bayer Diagnostics, Leverkusen, Germany) [18, 19]. High sensitivity CRP was measured by immunonephelometry (Nephelometry, Behring Nephelometer II, Dade Behring Marburg GmbH, Germany) with a detection limit of 0.2 mg/L (the values < 0.2 mg/L were regarded to be 0.1 mg/L). The fasting insulin concentration as a surrogate measurement of insulin sensitivity was measured with an immunoradiometric assay (Biosource, Nivelle, Belgium) with intra- and interassay coefficients of variation of 2.1- 4.5% and 4.7-12.2%, respectively.
Patients were classified as having MS if he or she had three or more of the following criteria: waist circumference ≥ 90 cm in men or ≥ 80 cm in women, elevated triglycerides ≥150 mg/dl, reduced HDL cholesterol < 40 mg/dl in men and < 50 mg/dl in women, blood pressure: ≥130/85 mmHg or treatment of previously diagnosed hypertension, elevated fasting glucose ≥ 100 mg/dl or treatment of previously diagnosed T2DM . Patient was diagnosed as having diabetes mellitus after 5 years, if she or he was being treated for diabetes or if the fasting glucose level was higher than or same as 126 mg/dL according to the criteria from American Diabetes Association .
The continuous variables were reported as mean values with standard deviations and they were compared using the independent t-test. Categorical variables were expressed as percentages and they were compared using χ2-tests. The relationship between the baseline insulin level and the future development of MS was analysed in 2 steps. First, the subjects were divided into 4 groups according to the quartiles of the baseline insulin level (IU/mL): I (≤6.01), II (6.02-7.29), III (7.30-8.97) and IV (≥8.98). We then used logistic regression analysis to determine the odds ratio (OR) of developing metabolic syndrome in the individuals stratified by the quartiles of the fasting insulin concentration (which was used as a surrogate measure of insulin resistance). Second, to better understand the role of hyperinsulinemia for increasing the risk of MS and this was independent of any MS component at baseline, we excluded the subjects who had any MS component at baseline and we reanalysed the data with logistic regression analysis. We conducted both unadjusted and adjusted analyses. Adjustments were made for the following variables: gender, age, the smoking status, the exercise level (less than once a week or at least once a week), the amount of alcohol the subject drank (grams/day) and the metabolic parameters (systolic blood pressure, HDL-Cholesterol, triglyceride, fasting glucose, waist circumference). All the significance tests were 2-tailed, and p values < 0.05 were considered to be statistically significant. All the statistical analyses were performed using SPSS version 17.0 software (SPSS Inc., Chicago, IL, USA).
Baseline characteristics of the participants according to the insulin stratification
(n = 592)
(n = 585)
(n = 588)
(n = 585)
41.9 ± 6.3
42.0 ± 6.4
40.7 ± 6.2
40.7 ± 6.0
Alcohol consumption (g/day)
12.6 ± 14.8
12.4 ± 16.9
11.3 ± 15.5
11.8 ± 14.8
Smoking % (No/Ex/Current)
(none/less than once per week/more than once per week)
22.7 ± 2.4
23.1 ± 2.5
23.8 ± 2.5
24.8 ± 2.8
Waist circumference (cm)
78.4 ± 8.2
79.1 ± 8.1
80.9 ± 8.1
83.7 ± 8.8
Systolic BP (mmHg)
112.9 ± 12.6
113.4 ± 12.4
114.5 ± 13.8
115.6 ± 13.6
Diastolic BP mmHg)
73.2 ± 9.6
73.4 ± 9.6
73.8 ± 10.1
74.5 ± 10.1
Fasting glucose (mg/dl)
87.4 ± 8.0
89.0 ± 7.9
90.9 ± 8.1
91.6 ± 7.6
112.4 ± 61.2
121.0 ± 64.3
135.2 ± 70.3
154.2 ± 82.6
58.7 ± 11.8
58.2 ± 11.6
56.8 ± 11.6
55.3 ± 11.2
117.2 ± 30.0
118.6 ± 30.0
119.6 ± 29.4
124.3 ± 31.0
0.82 ± 1.16
0.78 ± 1.18
0.92 ± 1.46
1.15 ± 1.87
Incidence and odds ratios for the development of MS according to baseline insulin quartile in 5 years of follow-up in whole cohort
(n = 592)
(n = 585)
(n = 588)
(n = 585)
Incident MS %(n)
Odds ratio (95% CI)
1.4 (0.8 - 2.4)
2.5 (1.5 - 4.1) *
5.1 (3.1 - 8.2)*
1.3 (0.7 - 2.4)
2.0 (1.2 - 3.4) †
3.6 (2.2 - 5.8)*
1.2 (0.7 - 2.1)
1.7 (1.0 - 2.9)
3.0 (1.8 - 5.0)*
1.1(0.6 - 2.1)
1.5 (0.9 - 2.5)
2.0 (1.2 - 3.3)†
After adjustment for gender, age, the smoking status, the exercise level, the amount of alcohol drank and the systolic blood pressure, the subjects in the highest quartile of the insulin levels had over a 5 times greater risk of developing MS as compared to that of the subjects in the lowest quartile (OR: 5.1, 95% CI: 3.1 - 8.2). This predictive importance remained significant even after adjustment for all the individual features of MS, and this underlines the potential importance of an elevated insulin level for predicting the development of MS (Table 2).
Odds ratios for the development of MS according to baseline insulin quartile in 5 years of follow-up in subjects without any MS components at baseline
Quartiles of baseline
fasting insulin level
Odds ratio (95% CI)
The development of individual MS components after 5 years
Subjects without any MS components at baseline
We addressed the hypothesis that measuring the fasting insulin in healthy subjects would enable predicting the subsequent development of MS. This study has shown that in a general cohort of healthy Asian subjects, 8.5% developed MS over a 5 year period and that elevated fasting insulin levels predicted the development of subsequent MS even in the subgroup of patients without any MS component at baseline. This was particularly seen for the subjects in the highest quartile of the insulin levels when compared to those subjects with lower fasting insulin levels. Therefore, high baseline fasting insulin levels independently predicted the development of MS over time.
Numerous studies have been performed that showed that insulin resistance is associated with MS per se or the factors that comprise MS (e.g., NAFLD [21, 22], T2DM [23, 24], CVD ). In the study by Mykkänen et al ., insulin sensitivity assessed by frequently sampled intravenous glucose tolerance test and the minimal model showed significant association with the number of metabolic disorders. In addition, fasting hyperinsulinemia has been used as a surrogate estimate of insulin resistance according to various combinations of fasting insulin and the glucose concentration such as HOMA (homeostatic model assessment) [27, 28], but not the fasting insulin level per se. Assuming that insulin resistance and the obesity being the central pathogenic factor in the development of MS, a recent study reported the role of leptin, an adipokine associated with obesity, on the prediction of MS and CVD risk . However, our study is the only study that has measured the baseline insulin concentration as a surrogate marker in order to evaluate the risk of developing MS among individuals with and without any MS component and as stratified by the fasting insulin concentration.
Morrison et al. have recently shown that an interaction between the BMI and the HOMA score is associated with the development of MS in children  and De Boer et al. has shown in children that the features of MS are correlated with the fasting insulin levels . Not surprisingly, higher fasting glucose within the normal range in children is associated with increased insulin levels, yet that study was correlative rather than prognostic . Our study adds to the growing evidence by showing that elevated insulin occurs early and it predicts the subsequent development of MS. We have also found that an elevated fasting insulin level itself is potentially a key early feature in the pathophysiology of the clinical risk factor cluster of MS.
There have been many studies that have shown that patients with MS are at an increased risk of cardiovascular atherosclerosis [32–35]. Mehta et al. have recently shown that measures of insulin resistance, such as HOMA-IR, add predictive value over and above the diagnosis of MS itself in terms of the correlation with coronary artery calcification, which is a marker of the atherosclerotic risk . In the study by Tenenbaum et al ., insulin resistance assessed by HOMA-IR was an independent predictor for new major cardiovascular events among patients with preexisting coronary artery disease. Therefore, strategies that screen patients' insulin levels and therapies that specifically target hyperinsulinemia may have value to prevent this common risk factor for CVD.
There are several limitations in our study. There is ongoing controversy about whether the concept of metabolic syndrome is useful to predict CVD and T2DM [2, 5, 9]. The diagnosis of MS has recently been shown to be useful for predicting subsequent CVD events, including in Asian cohorts  and in a recent meta-analysis . Insulin sensitivity does not account for 100% of the variation in insulin response . Kim et al. showed that the fasting insulin concentration reflects less than 40% of the variability in insulin resistance as measured by a direct technique, although the fasting insulin concentration is significantly associated with insulin resistance . This study population was extremely well characterized, yet it was a homogenous population and it is representative of an adult Korean working population. This limits the generalizability of the data to other patient populations to some extent. Although the euglycemic insulin clamp test is currently the best and most accurate technique for assessing insulin sensitivity, the fasting insulin level was used as the marker for insulin resistance in this current study . The reason we didn't use the euglycemic insulin clamp technique is that it is almost impossible to perform this test in all the participants in this kind of large study population. Lastly, we did not analyze the risk for MS with Cox proportional hazard model or Kaplan-Meir survival estimate. This study was done in subjects who performed health examination twice in 5 years of interval, 2003 and 2008. We cannot specify the exact point when the subjects developed the disease of interest during those 5 years. Therefore, Cox proportional hazard model or Kaplan-Meir survival estimate could not be used, and this could have lowered the significance of the results. However, our study result has its own meaning study in that high baseline insulin concentration predicts the risk of developing MS among individuals with and without any MS component and as stratified by the fasting insulin concentration.
In conclusion, this study is the first to evaluate elevated fasting insulin as an independent predictive factor for the development of subsequent MS over a 5 year period in a well characterized cohort of apparently healthy adults. This study supports the concept that hyperinsulinemia is an early feature, if not the central feature, of the cardiovascular clusters of MS. We have to keep in mind the importance of high fasting insulin levels not just as a surrogate marker to predict future development of MS, but also the increased risk for future CVD itself as well. The usefulness of strategies to reverse hyperinsulinemia, such as lifestyle modifications, on the prevention of MS and CVD, warrants further investigation.
We acknowledge the fine efforts of the health screening group at Kangbuk Samsung Hospital, Seoul, South Korea. This work was partially supported by a Samsung Biomedical Research Institute grant, SBRI C1-B1-114-1. AMW is supported by the University of Melbourne Bickart Fellowship.
- Grundy SM: Does a diagnosis of metabolic syndrome have value in clinical practice?. Am J Clin Nutr. 2006, 83: 1248-1251.PubMed
- Alberti KG, Eckel RH, Grundy SM, Zimmet PZ, Cleeman JI, Donato KA, Fruchart JC, James WP, Loria CM, Smith SC: Harmonizing the metabolic syndrome: a joint interim statement of the International Diabetes Federation Task Force on Epidemiology and Prevention; National Heart, Lung, and Blood Institute; American Heart Association; World Heart Federation; International Atherosclerosis Society; and International Association for the Study of Obesity. Circulation. 2009, 120: 1640-1645. 10.1161/CIRCULATIONAHA.109.192644.View ArticlePubMed
- Grundy SM, Cleeman JI, Daniels SR, Donato KA, Eckel RH, Franklin BA, Gordon DJ, Krauss RM, Savage PJ, Smith SC, Spertus JA, Costa F: Diagnosis and management of the metabolic syndrome: an American Heart Association/National Heart, Lung, and Blood Institute Scientific Statement. Circulation. 2005, 112: 2735-2752. 10.1161/CIRCULATIONAHA.105.169404.View ArticlePubMed
- Reaven GM: Banting lecture 1988. Role of insulin resistance in human disease. Diabetes. 1988, 37: 1595-1607. 10.2337/diabetes.37.12.1595.View ArticlePubMed
- Reaven GM: The metabolic syndrome: time to get off the merry-go-round?. J Intern Med. 2011, 269: 127-136. 10.1111/j.1365-2796.2010.02325.x.View ArticlePubMed
- Lee HT, Shin J, Lim YH, Kim BK, Kim YT, Lee JU, Hong S, Song SY, Cho SH: The relationship between coronary artery calcification and bone mineral density in patients according to their metabolic syndrome status. Korean Circ J. 2011, 41: 76-82. 10.4070/kcj.2011.41.2.76.PubMed CentralView ArticlePubMed
- Lim JH, Kim YK, Kim YS, Na SH, Rhee MY, Lee MM: Relationship between serum uric Acid levels, metabolic syndrome, and arterial stiffness in Korean. Korean Circ J. 2010, 40: 314-320. 10.4070/kcj.2010.40.7.314.PubMed CentralView ArticlePubMed
- Eckel RH, Grundy SM, Zimmet PZ: The metabolic syndrome. Lancet. 2005, 365: 1415-1428. 10.1016/S0140-6736(05)66378-7.View ArticlePubMed
- Simmons RK, Alberti KG, Gale EA, Colagiuri S, Tuomilehto J, Qiao Q, Ramachandran A, Tajima N, Brajkovich Mirchov I, Ben-Nakhi A, Reaven G, Hama Sambo B, Mendis S, Roglic G: The metabolic syndrome: useful concept or clinical tool? Report of a WHO Expert Consultation. Diabetologia. 2010, 53: 600-605. 10.1007/s00125-009-1620-4.View ArticlePubMed
- Hermans MP, Sacks FM, Ahn SA, Rousseau MF: Non-HDL-cholesterol as valid surrogate to apolipoprotein B100 measurement in diabetes: Discriminant Ratio and unbiased equivalence. Cardiovasc Diabetol. 2011, 10: 20-10.1186/1475-2840-10-20.PubMed CentralView ArticlePubMed
- Zavaroni I, Bonora E, Pagliara M, Dall'Aglio E, Luchetti L, Buonanno G, Bonati PA, Bergonzani M, Gnudi L, Passeri M: Risk factors for coronary artery disease in healthy persons with hyperinsulinemia and normal glucose tolerance. N Engl J Med. 1989, 320: 702-706. 10.1056/NEJM198903163201105.View ArticlePubMed
- Ferrannini E, Balkau B, Coppack SW, Dekker JM, Mari A, Nolan J, Walker M, Natali A, Beck-Nielsen H: Insulin resistance, insulin response, and obesity as indicators of metabolic risk. J Clin Endocrinol Metab. 2007, 92: 2885-2892. 10.1210/jc.2007-0334.View ArticlePubMed
- Kim SH, Reaven GM: Insulin resistance and hyperinsulinemia: you can't have one without the other. Diabetes Care. 2008, 31: 1433-1438. 10.2337/dc08-0045.PubMed CentralView ArticlePubMed
- Huang PL: A comprehensive definition for metabolic syndrome. Dis Model Mech. 2009, 2: 231-237. 10.1242/dmm.001180.PubMed CentralView ArticlePubMed
- Mehta NN, Krishnamoorthy P, Martin SS, St Clair C, Schwartz S, Iqbal N, Braunstein S, Schutta M, Rader DJ, Reilly MP: Usefulness of insulin resistance estimation and the metabolic syndrome in predicting coronary atherosclerosis in type 2 diabetes mellitus. Am J Cardiol. 2011, 107: 406-411. 10.1016/j.amjcard.2010.09.035.PubMed CentralView ArticlePubMed
- Liese AD, Mayer-Davis EJ, Tyroler HA, Davis CE, Keil U, Duncan BB, Heiss G: Development of the multiple metabolic syndrome in the ARIC cohort: joint contribution of insulin, BMI, and WHR. Atherosclerosis risk in communities. Ann Epidemiol. 1997, 7: 407-416. 10.1016/S1047-2797(97)00047-1.View ArticlePubMed
- Moebus S, Balijepalli C, Lösch C, Göres L, von Stritzky B, Bramlage P, Wasem J, Jöckel KH: Age- and sex-specific prevalence and ten-year risk for cardiovascular disease of all 16 risk factor combinations of the metabolic syndrome - A cross-sectional study. Cardiovasc Diabetol. 2010, 9: 34-10.1186/1475-2840-9-34.PubMed CentralView ArticlePubMed
- Sung KC, Kim SH, Reaven GM: Relationship among alcohol, body weight, and cardiovascular risk factors in 27, 030 Korean men. Diabetes Care. 2007, 30: 2690-2694. 10.2337/dc07-0315.View ArticlePubMed
- Sung KC, Ryan MC, Kim BS, Cho YK, Kim BI, Reaven GM: Relationships between estimates of adiposity, insulin resistance, and nonalcoholic fatty liver disease in a large group of nondiabetic Korean adults. Diabetes Care. 2007, 30: 2113-2118. 10.2337/dc07-0512.View ArticlePubMed
- American Diabetes Association: Standards of medical care in diabetes--2010. Diabetes Care. 2010, 33: S11-S61.PubMed CentralView Article
- Rhee EJ, Lee WY, Cho YK, Kim BI, Sung KC: Hyperinsulinemia and the development of nonalcoholic Fatty liver disease in nondiabetic adults. Am J Med. 2011, 124: 69-76. 10.1016/j.amjmed.2010.08.012.View ArticlePubMed
- Sung KC, Kim SH: Interrelationship between Fatty Liver and Insulin Resistance in the Development of Type 2 Diabetes. J Clin Endocrinol Metab. 2011, 96: 1093-1097. 10.1210/jc.2010-2190.PubMed CentralView ArticlePubMed
- Sung KC, Reaven GM, Kim SH: Utility of homeostasis model assessment of beta-cell function in predicting diabetes in 12, 924 healthy Koreans. Diabetes Care. 2010, 33: 200-202. 10.2337/dc09-1070.PubMed CentralView ArticlePubMed
- Song Y, Manson JE, Tinker L, Howard BV, Kuller LH, Nathan L, Rifai N, Liu S: Insulin sensitivity and insulin secretion determined by homeostasis model assessment and risk of diabetes in a multiethnic cohort of women: the Women's Health Initiative Observational Study. Diabetes Care. 2007, 30: 1747-1752. 10.2337/dc07-0358.PubMed CentralView ArticlePubMed
- Reaven GM: Insulin resistance: the link between obesity and cardiovascular disease. Endocrinol Metab Clin North Am. 2008, 37: 581-601. 10.1016/j.ecl.2008.06.005. vii-viiiView ArticlePubMed
- Mykkänen L, Haffner SM, Rönnemaa T, Bergman RN, Laakso M: Low insulin sensitivity is associated with clustering of cardiovascular disease risk factors. Am J Epidemiol. 1997, 146: 315-321.View ArticlePubMed
- Abbasi F, Reaven GM: Evaluation of the quantitative insulin sensitivity check index as an estimate of insulin sensitivity in humans. Metabolism. 2002, 51: 235-237. 10.1053/meta.2002.28970.View ArticlePubMed
- Kim SH, Abbasi F, Reaven GM: Impact of degree of obesity on surrogate estimates of insulin resistance. Diabetes Care. 2004, 27: 1998-2002. 10.2337/diacare.27.8.1998.View ArticlePubMed
- Li WC, Hsiao KY, Chen IC, Chang YC, Wang SH, Wu KH: Serum leptin is associated with cardiometabolic risk and predicts metabolic syndrome in Taiwanese adults. Cardiovasc Diabetol. 2011, 10: 36-10.1186/1475-2840-10-36.PubMed CentralView ArticlePubMed
- Morrison JA, Glueck CJ, Horn PS, Schreiber GB, Wang P: Homeostasis model assessment of insulin resistance*body mass index interactions at ages 9 to 10 years predict metabolic syndrome risk factor aggregate score at ages 18 to 19 years: a 10-year prospective study of black and white girls. Metabolism. 2009, 58: 290-295. 10.1016/j.metabol.2008.09.027.View ArticlePubMed
- DeBoer MD, Gurka MJ: Ability among adolescents for the metabolic syndrome to predict elevations in factors associated with type 2 diabetes and cardiovascular disease: data from the national health and nutrition examination survey 1999-2006. Metab Syndr Relat Disord. 2010, 8: 343-353. 10.1089/met.2010.0008.PubMed CentralView ArticlePubMed
- Benetos A, Thomas F, Pannier B, Bean K, Jego B, Guize L: All-cause and cardiovascular mortality using the different definitions of metabolic syndrome. Am J Cardiol. 2008, 102: 188-191. 10.1016/j.amjcard.2008.03.037.View ArticlePubMed
- Butler J, Mooyaart EA, Dannemann N, Bamberg F, Shapiro MD, Ferencik M, Brady TJ, Hoffmann U: Relation of the metabolic syndrome to quantity of coronary atherosclerotic plaque. Am J Cardiol. 2008, 101: 1127-1130. 10.1016/j.amjcard.2007.12.012.PubMed CentralView ArticlePubMed
- Espinola-Klein C, Rupprecht HJ, Bickel C, Post F, Genth-Zotz S, Lackner K, Munzel T, Blankenberg S: Impact of metabolic syndrome on atherosclerotic burden and cardiovascular prognosis. Am J Cardiol. 2007, 99: 1623-1628. 10.1016/j.amjcard.2007.01.049.View ArticlePubMed
- Ho JS, Cannaday JJ, Barlow CE, Mitchell TL, Cooper KH, FitzGerald SJ: Relation of the number of metabolic syndrome risk factors with all-cause and cardiovascular mortality. Am J Cardiol. 2008, 102: 689-692. 10.1016/j.amjcard.2008.05.010.View ArticlePubMed
- Tenenbaum A, Adler Y, Boyko V, Tenenbaum H, Fisman EZ, Tanne D, Lapidot M, Schwammenthal E, Feinberg MS, Matas Z, Motro M, Behar S: Insulin resistance is associated with increased risk of major cardiovascular events in patients with preexisting coronary artery disease. Am Heart J. 2007, 153: 559-565. 10.1016/j.ahj.2007.01.008.View ArticlePubMed
- Irie F, Iso H, Noda H, Sairenchi T, Otaka E, Yamagishi K, Doi M, Izumi Y, Ota H: Associations between metabolic syndrome and mortality from cardiovascular disease in Japanese general population, findings on overweight and non-overweight individuals. Ibaraki Prefectural Health Study. Circ J. 2009, 73: 1635-1642. 10.1253/circj.CJ-08-0442.View ArticlePubMed
- Mottillo S, Filion KB, Genest J, Joseph L, Pilote L, Poirier P, Rinfret S, Schiffrin EL, Eisenberg MJ: The metabolic syndrome and cardiovascular risk a systematic review and meta-analysis. J Am Coll Cardiol. 2010, 56: 1113-1132. 10.1016/j.jacc.2010.05.034.View ArticlePubMed
- Radziuk J: Insulin sensitivity and its measurement: structural commonalities among the methods. J Clin Endocrinol Metab. 2000, 85: 4426-4433. 10.1210/jc.85.12.4426.PubMed
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