Bodystat Ltd, P.O. Box 50, Douglas, Isle of Man IM99 1DQ, United Kingdom.
Clin Nutr. 2010 Oct;29(5):560-6. doi: 10.1016/j.clnu.2009.12.011. Epub 2010 Mar 31.
The study aimed to establish the effects of age, gender and age-gender interactions on BMI-% fat relationships over a wide range of BMI and age. It also aimed to examine controversies regarding linear or curvilinear BMI-% fat relationships.
Body composition was measured using validated bio-impedance equipment (Bodystat) in a large self-selected sample of 23,627 UK adults aged 18-99 (99% ≤70) years, of which 11,582 were males with a mean BMI of 26.3±4.7 (sd) kg/m(2), and 12,044 females, with a mean BMI of 25.7±5.1 kg/m(2). Multiple regression analysis was used.
BMI progressively increased with age in women and plateaued between 40 and 70 years in men. At a fixed BMI, body fat mass increased with age (1.9 kg/decade), as did % fat (1.1-1.4% per decade). The relationship between BMI and % fat was found to be curvilinear (quadratic) rather than linear, with a weaker association at lower BMI. There was also a small but significant age-gender interaction.
The association between BMI and % body fat is not strong, particularly in the desirable BMI range, is curvilinear rather than linear, and is affected by age.
本研究旨在确定年龄、性别和年龄-性别相互作用对 BMI-%脂肪关系的影响，范围涵盖广泛的 BMI 和年龄。此外，本研究还旨在探讨 BMI-%脂肪关系呈线性或曲线性的争议。
采用经过验证的生物阻抗设备（Bodystat）对 23627 名年龄在 18-99 岁（99%≤70 岁）的英国成年人进行了身体成分测量，其中 11582 名男性的平均 BMI 为 26.3±4.7（标准差）kg/m2，12044 名女性的平均 BMI 为 25.7±5.1 kg/m2。使用多元回归分析。
女性的 BMI 随年龄逐渐增加，在 40-70 岁之间趋于平稳；而男性的 BMI 则在该年龄段之间保持稳定。在固定的 BMI 下，体脂肪量随年龄增长而增加（每十年增加 1.9 公斤），%脂肪也随之增加（每十年增加 1.1-1.4%）。BMI 和%脂肪之间的关系呈曲线（二次）关系，而不是线性关系，在较低的 BMI 下，相关性较弱。此外，还存在微小但显著的年龄-性别相互作用。
BMI 和体脂肪百分比之间的关联并不强，尤其是在理想的 BMI 范围内，呈曲线关系而不是线性关系，并且受年龄影响。
