Effect of age on body composition in healthy Beijing women

摘要

Objective:To explore the effect of age on body composition in healthy Beijing women.Methods:We measured body composition with dual-energy X-ray (GE Lunar Prodigy) in 316 healthy Beijing females aged 20 to 74 years (5-7 women per age).Parameters provided by the software were as following:total body bone mineral content (BMC),lean mass (LM),fat mass and fat mass percentage (FM％).Local regions measured included arm,leg,trunk,android region and gynoid region.Body mass index (BMI),fat mass index (FMI),free fat mass index (FFMI) and A/G were calculated.Volunteers were assigned to 6 groups according to age by every ten years a group.Results..BMC peaked during the 4th decade,LM peaked during the 5th decade,with a decline of 18.1％ and 5.2％ respectively at age 74 years.Total body fat mass and FM％ showed a general increase with aging throughout the studied age range.Total body fat mass increased from (16±5) kg at age 20-29 years to (24±6)kg at age 70-74years,while FM％ increased from 31.3％ to 39.5％.All local region FM％ increased with aging at different extents.Android region FM％ showed the largest raise extent (32.2％).BMI increased gradually from 21.1 kg/m2 at age 20-29 years to 26.1 kg/m2 at age 70-74 years.FMI changed more obviously than FFMI.A/G increased from 0.85 at age 20-29 years to 1.02 at age 70-74 years.Different menstrual status in women of 40-59 years had obvious effect on A/G and BMC (P＜0.05),while it had no significant effect on BMI,body weight and waist circumference (P＞0.05).Conclusion:Aging has a great effect on body composition distribution in healthy Beijing women.