TAILIEUCHUNG - Body composition in the elderly: Reference values and bioelectrical impedance spectroscopy to predict total body skeletal muscle mass

How well older people make economic decisions is an important issue for social policy. Since wealth tends to accumulate over one’s lifetime, a large portion is in the hands of older people. Both long-term trends (increased longevity) and short-term trends (baby booms) mean that increasing proportions of the population are older and retired. Also, older people are more likely to vote than young people are, so they may have disproportionate political influence. It is conceivable that our scientific model of economic decision making, so heavily rooted in studies of 20-year-old students, is a misleading guide to the behavior of older people | Clinical Nutrition 28 2009 52-58 ELSEVIER Contents lists available at ScienceDirect Clinical Nutrition journal homepage http journals clnu Original Article Body composition in the elderly Reference values and bioelectrical impedance spectroscopy to predict total body skeletal muscle massq Marja Tengvalla Lars Ellegảrda Vibeke Malmrosa Niklas Bosaeusa Lauren Lissnerb Ingvar Bosaeusa a Department of Clinical Nutrition Sahlgrenska University Hospital Sahlgrenska Academy at University of Gothenburg SE 405 30 GOTEBORG Sweden b Department of Public Health and Community Medicine Sahlgrenska University Hospital Sahlgrenska Academy at University of Gothenburg SE 405 30 GOTEBORG Sweden ARTICLE INFO s u M M A R y Article history Received 19 March 2008 Accepted 6 October 2008 Keywords Body composition Bioelectrical impedance Elderly Fat free mass Skeletal muscle mass Dual-energy X-ray absorptiometry Background aims To validate the bioelectrical impedance spectroscopy BIS model against dualenergy X-ray absorptiometry DXA to develop and compare BIS estimates of skeletal muscle mass SMM to other prediction equations and to report BIS reference values of body composition in a population-based sample of 75-year-old Swedes. Methods Body composition was measured by BIS in 574 subjects and by DXA and BIS in a subset of 98 subjects. Data from the latter group was used to develop BIS prediction equations for total body skeletal muscle mass TBSMM . Results Average fat free mass FFM measured by DXA and BIS was comparable. FFMBIS for women and men was kg and kg respectively. Average fat free mass index FFMI and body fat index BFI for women were and . Average FFMI and BFI for men were and . Existing bioelectrical impedance analysis equations to predict SMM were not valid in this cohort. A TBSMM prediction equation developed from this sample had an Rpred of indicating that the equation would explain 91 of the variability in future .

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