Absolute Value of Bioelectrical Impedance Analysis-Measured Visceral Fat Area with Obesity-Related Cardiovascular Risk Factors in Japanese Workers

  • Okauchi Yukiyoshi
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Kishida Ken
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Funahashi Tohru
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Noguchi Midori
    Amagasaki City Office, General Affairs Bureau, Personal Department, Payroll Section, Employee Health Promotion Section.
  • Ogawa Tomoko
    Amagasaki City Office, General Affairs Bureau, Personal Department, Payroll Section, Employee Health Promotion Section.
  • Ryo Miwa
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Okita Kohei
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Iwahashi Hiromi
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Imagawa Akihisa
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.
  • Nakamura Tadashi
    Kawasaki Hospital.
  • Matsuzawa Yuji
    Sumitomo Hospital.
  • Shimomura Iichiro
    Department of Metabolic Medicine, Graduate School of Medicine, Osaka University.

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Abstract

Aim: The accumulation of Visceral fat is known to precede metabolic disorders and atherosclerosis. This study aimed to determine the relationships between body mass index (BMI), waist circumference (WC), estimated visceral fat area (eVFA) measured by bioelectrical impedance analysis (BIA), and obesity-related cardiovascular risk factors.<BR>Methods: The study population was 2,870 middle-aged Japanese employees (males/females=2,322/ 548), who had undergone a health check-up.<BR>Results: In the receiver operating characteristic (ROC) curve, the cutoff levels yielding maximal sensitivity plus specificity for predicting the prevalence of ≥ 2 risks were, 24.5 kg/m2 for BMI, 84.6 cm for WC, and 111 cm2 for eVFA in males, and 23.6 kg/m2, 81.5 cm, and 67 cm2 in females. The average number of risk factors was over 1.0 in those with a BMI ≥ 25 kg/m2 and with a WC ≥ 85 cm for males, ≥ 28 kg/m2 and ≥ 95 cm respectively for females, and those with an eVFA ≥ 100 cm2 for both males and females. In males, it was around 1.0 with cutoff levels of BMI, WC, and eVFA from the ROC curve. However, in females, it was around 0.6, because the prevalence of subjects with obesity and multiple risks was very low.<BR>Conclusions: These results suggested that the cutoff level for visceral fat reduction should be set based on an absolute value of risk factors, rather than a calculated value. In regular health check-up, it may be useful to set an absolute cutoff value for eVFA at 100 cm2 as criteria to screen for multiple obesity-related cardiovascular risk factors.

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