推荐回答(1个)
按照脂肪分布的部位和特点,肥胖分为中心性肥胖和全身性肥胖。中心性肥胖也称之为腹型肥胖是指以腹部或内脏脂肪积聚为主引起的肥胖,全身性肥胖也称为四肢型肥胖是指全身较均匀的脂肪积聚引起的肥胖。中心性肥胖身体最粗的部位在腹部,而全身性肥胖身体最粗的部位在臀部。因此二者也分别被形象地称为苹果型身材和梨型身材。
研究已证实,中心性肥胖发生心血管疾病和代谢性疾病的危险明显高于全身性肥胖,这些疾病包括动脉硬化、冠心病、高血压、2 型糖尿病以及血脂代谢异常等。所以,肥胖程度完全相同的个体,因其不同的脂肪分布类型,而有明显不同的危险性。
可见,对于肥胖者而言,除了要判定自己的BMI 以外,还要确定自己是属于中心性还是全身性肥胖。测量腰围和腰臀比是评估肥胖类型的简单易行的方法。腰围是反映脂肪总量和脂肪分布的综合指标。WHO 建议欧洲人群的适宜标准为男性94cm,女性80cm。目前,亚洲人群的暂定标准为男性90cm,女性80cm。腰围超过以上标准者存在中心性肥胖。
WHO 推荐测量腰、臀围的方法如下:测量腰围时,被测者站立,双脚分开25 ~ 30cm,体重均匀分配。测量位置在水平位髂前上棘和十二肋连线的中点。测量者坐在被测者一旁,将测量尺紧贴身体,但不能压迫软组织,测量值精确到0.1cm。臀围则通过环绕臀部的骨盆最突出点测量周径而得到。按照上面的要求去做,你就可以得到自己腰围和臀围的正确结果了。
所以,对亚洲人群来说,腰围90cm 以上男性和腰围80cm 以上女性即使BMI 正常,肥胖相关疾病的危险也将增加。对于超重和肥胖者,如果再伴有腰围的增加,则肥胖症相关疾病的发病危险更进一步增加。
腰臀比是指腰围与臀围的比值。男性腰臀比>1.0,女性腰臀比>0.85 被定义为腹部脂肪堆积,即存在中心性肥胖。腰臀比是早期研究中预测肥胖的指标,检测中心性肥胖时,腰围指标较腰臀比更为有效。现在更倾向于用腰围代替腰臀比预测腹部脂肪含量。
临床上,可以采用第3 和第4 腰椎水平的计算机断层扫描(CT)或核磁共振扫描(MRI)来精确计算内脏脂肪面积。面积>130cm2,肥胖相关疾病危险增加;面积
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