Guida Bruna, Laccetti Roberta, Gerardi Clara, Trio Rossella, Perrino Nunzia Ruggiero, Strazzullo Pasquale, Siani Alfonso, Farinaro Eduardo, Colantuoni Antonio
Department of Neuroscience, Physiology Nutrition Unit, University Federico II, Naples, Italy.
Nutr Metab Cardiovasc Dis. 2007 Mar;17(3):175-80. doi: 10.1016/j.numecd.2005.11.001. Epub 2006 Mar 9.
Significant changes in body composition that have important health related effects may occur in the elderly. In this study, we evaluated the bioelectrical characteristics in a large group of apparently healthy Caucasian men in the age range 50-80 years, as a function of age and body mass index.
We studied 315 men with ages ranging from 50 to 80 years. They were divided into three groups according to body mass index (kg/m(2)): 18.5-24.9 normoweight (NW); 25.0-29.9 overweight (OW); > or =30 obese (OB), and they were classified in nine age subgroups: 50-59 (young-old, YO); 60-69 (old, O); 70-80 (oldest, OS). Fat-free mass, fat mass and body cell mass were investigated using conventional bioelectrical impedance analysis. Body composition was also assessed by bioelectrical impedance vector analysis and the RXc graph method.
Body cell mass decreased significantly with age particularly in subgroups of the OW and OB groups (p<0.05). Mean vector displacement followed a definite pattern, with downward migration of the ellipses in the OW and OB groups, after 70 years of age.
Ageing was associated with a pattern of vector bioelectrical impedance analysis indicating decreased soft tissue mass (fat-free mass and body cell mass), particularly in OW and OB-OS healthy men. We suggest 70 years of age as a cut-off for significant quantitative and qualitative (tissue electrical properties) body composition modifications. This bioelectrical impedance vector analysis pattern associated with ageing and across the different body mass index categories, may be useful for clinical purposes and can be used in geriatric routine to accurately assess the body composition modifications occurring in the elderly.
老年人身体成分可能会发生显著变化，这些变化对健康具有重要影响。在本研究中，我们评估了一大组年龄在50至80岁之间、看似健康的白种男性的生物电特征，该特征是年龄和体重指数的函数。
我们研究了315名年龄在50至80岁之间的男性。根据体重指数（kg/m²）将他们分为三组：体重正常（NW），18.5 - 24.9；超重（OW），25.0 - 29.9；肥胖（OB），≥30，并将他们分为九个年龄亚组：50 - 59岁（年轻老人，YO）；60 - 69岁（老年人，O）；70 - 80岁（最年长者，OS）。使用传统生物电阻抗分析技术研究无脂肪质量、脂肪质量和身体细胞质量。还通过生物电阻抗矢量分析和RXc图法评估身体成分。
身体细胞质量随年龄显著下降，尤其是在超重和肥胖组的亚组中（p<0.05）。平均矢量位移呈现出一定模式，70岁以后，超重和肥胖组的椭圆向下迁移。
衰老与矢量生物电阻抗分析模式相关，表明软组织质量（无脂肪质量和身体细胞质量）下降，尤其是在超重和肥胖 - 最年长者的健康男性中。我们建议将70岁作为身体成分发生显著定量和定性（组织电特性）变化的临界值。这种与衰老相关且跨越不同体重指数类别的生物电阻抗矢量分析模式，可能对临床有用，可用于老年病常规检查，以准确评估老年人身体成分的变化。
