中年女性体脂百分比测量及其回归方程的优选研究

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.

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

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.