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Specific bioelectrical impedance vector reference values for assessing body composition in the Italian elderly
- Source :
- Experimental Gerontology. 50:52-56
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Objective To obtain specific bioelectrical impedance vector reference values for the healthy elderly Italian population, and to study age- and sex-related differences in body composition. Design The study group consisted of 560 healthy individuals (265 men and 295 women) aged 65 to 100 y, whose anthropometric (height, weight, and calf, arm and waist circumferences) and bioelectrical measurements (resistance [R] and reactance [Xc], at 50 kHz and 800 μA) were recorded. R (Ω) and Xc (Ω) values were standardized for stature (H, m) to obtain the classic bioelectrical values. Specific values (resistivity [R sp ] and reactivity [Xc sp ], Ω · cm) were obtained by multiplying R and Xc by a correction factor (A/L) that includes an estimate of the cross-sectional area of the body (A = 0.45 arm area + 0.10 waist area + 0.45 calf area), where L = 1.1 H. Results Descriptive statistics were: R sp (391.8 ± 57.9), Xc sp (42.6 ± 9.9), Z sp (394.2 ± 58.2), phase angle (6.2° ± 1.2) in men; R sp (462.0 ± 80.1), Xc sp (47.9 ± 11.2), Z sp (464.6 ± 80.5), phase angle (5.9° ± 1.0) in women. The Xc sp and phase angle values showed a significant age-related decrease in both sexes, but especially in men, possibly relating to a gradual loss of muscle mass. Women's R sp and Z sp values tended to drop, attributable to their declining proportion of fat mass. A declining sexual dimorphism was also apparent. Conclusions Specific tolerance ellipses can be used for reference purposes for the Italian population when assessing body composition in gerontological practice and for epidemiological purposes.
- Subjects :
- Male
Aging
Waist
Biochemistry
Fat mass
Endocrinology
Animal science
Reference Values
Electric Impedance
Genetics
medicine
Humans
Geriatric Assessment
Molecular Biology
Dual-energy X-ray absorptiometry
Aged
Mathematics
Aged, 80 and over
Sex Characteristics
Anthropometry
medicine.diagnostic_test
Phase angle
Cell Biology
Composition (combinatorics)
Reference values
Body Composition
Female
Bioelectrical impedance analysis
Subjects
Details
- ISSN :
- 05315565
- Volume :
- 50
- Database :
- OpenAIRE
- Journal :
- Experimental Gerontology
- Accession number :
- edsair.doi.dedup.....220d933cd2a109a85126aec57ffb3ef5