成年人身高与去脂组织重的关系

目的研究成年人去脂组织重(fat-free mass,FFM)与身高之间的关系,并建立预测FFM的简单方程.方法对955名健康成年人进行人体测量和生物电阻抗测量,按BMI分为肥胖组和非肥胖组,按年龄分别45岁以下组和45岁以上组,分析FFM与年龄和肥胖的关系.根据FFM是身高的异速生长指数的模型关系,进行非线性回归,建立指数曲线回归方程.结果18～45岁健康成年人的身高为(1.65±0.07)m,体质量为(62.03±10.69)kg,体脂质量(11.28±6.75)kg,体脂含量(17.91±8.67)%,去脂组织含量(82.02±8.87)%,BMI(22.85±2.99)kg/m2,而46～74岁健康成年人的相应指标为(1.62±0.08)m,体质量为(66.08±10.21)kg,体脂质量(14.56±6.44)kg,体脂含量(22.09±9.23)%,去脂组织含量(77.58±10.07)%,BMI(25.19±2.95)kg/m2,差异有显著性意义(P＜0.05);18～45岁与46～74岁的健康人的FFM分别为(50.93±10.23),(51.53±10.07)kg,差异无显著性意义(P＞0.05);健康成年人的FFM并不随年龄增加;非肥胖组与肥胖组的FFM也是相对不变的.预测男性FFM的适宜方程为FFM(kg)=24.98×身高1.68,预测女性FFM的适宜方程为FFM(kg)=22.84×身高1.42.结论以身高为变量能估计出正常成年人FFM的近似值.

Relationship between body height and fat-free mass in healthy adults

AIM: To investigate the relationship between body height and fat-free mass (FFM) in order to derive an approximation formula of FFM in healthy adults.METHODS: Totally 955 healthy adults were divided into obesity group and non-obesity group according to body mass index (BMI) and redivided into two groups by the age of 45, and the relation of FFM with age and obesity was analyzed. Nonlinear regression analysis was performed to assess the allometric relation of FFM with body height.RESULTS: For the healthy adults aged 18-45 years old, the body height was(1.65 ±0.07) m, body mass was(11.28 ±6.75) kg, the fat mass was (11.28 ±6.75) kg, the body fat percentage was(17.91±8.67)%, the FFM percentage was(82.02 ± 8.87)% and the BMI was(22.85 ± 2.99) kg/m2,but for the healthy adults aged 46-74 years old, the body height was ( 1.65 ± 0.07) m, the body mass was(66.08 ± 10.21 ) kg, the fat mass was (14.56 +6.44) kg, the body fat percentage was(22.09 ±9.23)%, the FFM percentage was(77.58 ± 10.07)% and the BMI was(25.19 ± 2.95) kg/m2,the differences were significant ( P ＜ 0.05 ) . There was no significant difference in FFM between those aged 18-45 (50.93 ± 10.23) kg] and those aged 46-74(51.53±10.07) kg] (P＞ 0.05) .The values forFFM in healthy adults increased with age and did not differ between obesity and non-obesity groups. The equations obtained by non-linear regression analysis that provided the best approximation of FFM for males was FFM(kg)=24.98 × Height1.68 and for females was FFM(kg) = 22.84 × Height1.42.CONCLUSION: The exponential of body height as a predictor variable can be used to estimate the approximation of FFM.