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(Arteriosclerosis, Thrombosis, and Vascular Biology. 1996;16:269-274.)
© 1996 American Heart Association, Inc.

Articles

Characteristics of the Insulin Resistance Syndrome in a Japanese Population

The Jichi Medical School Cohort Study

Kazuomi Kario; Naoki Nago; Kazunori Kayaba; Tomohiro Saegusa; Hitoshi Matsuo; Tadao Goto; Akizumi Tsutsumi; Shizukiyo Ishikawa; Toshio Kuroda; Takeshi Miyamoto; Takefumi Matsuo; Kazuyuki Shimada; on behalf of the Jichi Medical School Cohort Study Group

From the Department of Internal Medicine, Awaji-Hokudan Public Clinic (K. Kario) and Hyogo Prefectural Awaji Hospital (K. Kario, T. Matsuo), Hyogo, Japan; Department of Community and Family Medicine (N.N., K. Kayaba) and Department of Cardiology (T.K., K.S.), Jichi Medical School, Tochigi, Japan; Department of Internal Medicine, Sakuma Hospital (T.S.), Shizuoka, Japan; Department of Internal Medicine, Takasu National Health Insurance Clinic (H.M.), Gifu, Japan; Department of Internal Medicine, Wara National Health Insurance Hospital (T.G.), Gifu, Japan; Department of Internal Medicine, Akaike Hospital (A.T., S.I.), Fukuoka, Japan; and Department of Internal Medicine, Reihoku Central Hospital (T. Miyamoto), Kohchi, Japan.

Correspondence to Dr Kazuomi Kario, 480 Ikuha, Hokudan, Tsuna, Hyogo, 656-16, Japan.

Abstract We investigated the relationships between hyperinsulinemia (a major indicator of the insulin resistance syndrome), blood pressure, dyslipidemia, and coagulation factors in 2606 community-dwelling Japanese individuals as part of the Jichi Medical School Cohort Study. An age-related decrease of the fasting insulin level was found in men but not in women. Body mass index, systolic and diastolic blood pressure, triglyceride and fasting glucose levels, and factor VII activity all increased in both sexes as the insulin level became higher, while the HDL cholesterol level decreased. In addition, total cholesterol and LDL cholesterol levels increased as the insulin level became higher and lipoprotein(a) levels decreased in the men. Fibrinogen levels were not related to the insulin level in either sex. Multiple logistic regression analysis revealed that fasting insulin levels were positively correlated with body mass index and fasting glucose and factor VII activity levels, whereas they were negatively correlated with HDL cholesterol in both sexes. In addition, fasting insulin levels were positively correlated with LDL cholesterol levels in men and with triglyceride levels in women. Our results indicate that hyperinsulinemia is associated with high factor VII activity in a general Japanese population as well as with high blood pressure and dyslipidemia. The accumulation of these cardiovascular risk factors in hyperinsulinemic subjects appears to contribute to cardiovascular events in the Japanese as well as in westerners.

Key Words: insulin resistance syndrome • Japanese • factor VII • dyslipidemia • blood pressure

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