The research on the estimation of visceral fat area by the bioelectric impedance method

皮肤褶皱厚度、水密度称重和体重指数(BMI)已经可以用来确定人体成分。最近，与腹内脂肪的相关性被报道为冠状动脉硬化、胰岛素抵抗的危险因素。它能够对肥胖和内脏脂肪产生许多兴趣，以预防与生活方式相关的疾病。然而，除了计算机断层成像(CT)方法之外，还没有其他方法来评估内脏脂肪区域。使用四极多频生物电阻抗的新仪器已经被开发出来，从5 kHz到1 MHz可以区分细胞外和细胞内的阻力。本研究的目的是建立方便实用的公式，利用多频生物电阻抗、人体节段周长和皮褶厚度来计算内脏脂肪区域。腹部CT扫描图像取自脐部水平。受试者82人(男51人，女31人)，年龄18~69岁，平均体重指数男性22.58 kg/m~2，女性21.1158 kg/m~2。CT测定的平均内脏脂肪面积男性为46.2cm2，女性为34.2cm2。本研究建立的估计内脏脂肪面积的多元回归方程为：腹部2.973^*BMI+1.151^*年龄+1.006^*臀部+0.727^*WAIT+0.538^*Ri-216.075。腹部CT脐平面内脏脂肪面积与估计内脏脂肪面积的相关系数为0.895(P<0.01)。这些发现表明，该方程可用于评估是否适用于内脏脂肪区域。

Skin fold thickness, hydrodensitometric weighing and body mass index (BMI) have become available for determination for the human body composition. Recently, the relevance to intra-abdominal visceral fat was reported as a risk factor for coronary artery sclerosis, insulin resistance. It was able to have many interests on the obesity and visceral fat to prevent of lifestyle-related disease. However, there is no method except for the computed tomography method (CT) for evaluating visceral fat area.New instruments using a tetrapolar multi-frequency bioelectric impedance have been developed from 5 kHz to 1 MHz could possibly distinguish between extra and intra-cellular resistance.The purpose of this study was to develop convenient and useful equations for of visceral fat area by multi-frequency bioelectric impedance, circumferences of body segment and skinfold thickness. Abdominal CT scan image was obtained at the level of umbilicus. The subjects were 82 persons (male : 51, female : 31) aged 18 to 69 years.The average BMI were 22.58 kg/m^2 for male, 21.1158 kg/m^2 for female. The average visceral fat area determined by CT were 46.2 cm^2 for male and 34.2 cm^2 for female.Multiple regression equation developed in this study for estimating visceral fat area was 2.973^*BMI + 1.151^*age + 1.006^*hip + 0.727^*wait + 0.538^*Ri of abdomen - 216.075. The correlation between visceral fat area by abdominal CT at the umbilicus level and estimating visceral fat area was 0.895 (p<0.01). These findings suggest that the equation may be useful for assessment of applicable to a visceral fat area.