中年女性体脂百分比测量及其回归方程的优选研究

Measurement of Body Fat Percentage of women and optimized selection of regressive equations

根据体脂百分比回归方程,正确了解中年女性的肥胖程度和健康状况.根据健身习惯将64名健康中年女性分为健身组和非健身组,然后分别测定其体脂百分比、身体围度及派生指标BMI和WHR,进行相关性分析、逐步筛选回归分析,最终优选出预测中年女性身体体脂百分比的回归方程.结果表明:健身组中年女性中WHR与体脂率的相关性(r=0.854)最高,BMI与体脂率的相关性(r=0.657)最低;非健身组中年女性中BMI与体脂率的相关性(r=0.877)最高,WHR与体脂率的相关性(r=0.753)最低,说明在用BMI、WC、HC、WHR判断肥胖时,对于健身组和非健身组的人群是有差异性的.研究建立了适合中年女性的全身体脂率的推算公式:健身组女性体脂百分比(Fat%):y=38.514×WHR-1.7043;非健身组女性体脂百分比(Fat%):y=-3.481+0.112×HC+0.943×BMI.使用单一的评价标准(BMI或WHR)来判断中年女性肥胖时,对于健身组和非健身组是有差异性的.以BMI、WHR及身体围度作为自变量,以中年女性体脂百分比为因变量建立回归方程,中年女性的体脂百分比可以方便有效地根据优选方程进行估算.

To accurately understand the obesity levels and health conditions based on the regressive equation of Body Fat Percent- age （BFP）. According to different fitness habits, sixty four middle-aged women were divided into two groups ：fitness group and non fitness group. After gathering the information of their BFP, body circumference and two derived indices BM! and WHR respec- tively during the independent measuring, correlation analysis and stepwise sifting regression analysis were made. Finally, the pre- dicted regressive equation of estimating the middle-aged female BFP was worked out. To the women in fitness group, the correla- tion of WHR and BFP reaches maximum, i.e. r = 0.854 ; the correlation of BMI and BFP reaches minimum, i.e. r = 0.657. To the women in non fitness group, the correlation of BMI and BFP reaches maximum, i.e. r = 0. 877 ; the correlation of WHR and BFP reaches minimum, i.e. r =0. 753. That is to say,it is different for fitness group and non fitness group to identify obesity lev- els by using BMI,WC,HC and WHR. This study established the proper formula to calculate the fat percentage for middle-aged women： Fat% to fitness group by y=38.514 × WHR-1. 7043; Fat% to non fitness group by y =-3.481 ＋0. 112 ×HC ＋0.943 × BMI. It is different for fitness group and non fitness group to identify obesity levels of middle-aged women by using single criterion （BMI or WHR）. BFP of middle-aged women could be easily worked out via the optimized equation, which takes BMI, WHR and body circumference as independent variables and BFP of middle-aged women as dependent variable and sets up the regressive e- quation.