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Specific bioelectrical impedance vector reference values for assessing body composition in the Italian elderly.
Exp Gerontol 2014; 50:52-6EG

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 [Rsp] and reactivity [Xcsp], 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=1.1H.

RESULTS

Descriptive statistics were: Rsp (391.8±57.9), Xcsp (42.6±9.9), Zsp (394.2±58.2), phase angle (6.2°±1.2) in men; Rsp (462.0±80.1), Xcsp (47.9±11.2), Zsp (464.6±80.5), phase angle (5.9°±1.0) in women. The Xcsp 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 Rsp and Zsp 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.

Authors+Show Affiliations

Department of Environmental and Life Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy.Department of Environmental and Life Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy.Department of Environmental and Life Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy.Department of Medicine-DIMED, Geriatrics Division, University of Padova, via Giustiniani 2, 35128 Padova, Italy.Department of Medicine-DIMED, Geriatrics Division, University of Padova, via Giustiniani 2, 35128 Padova, Italy.Department of Medicine-DIMED, Geriatrics Division, University of Padova, via Giustiniani 2, 35128 Padova, Italy.Department of Environmental and Life Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, Italy. Electronic address: emarini@unica.it.

Pub Type(s)

Journal Article
Multicenter Study
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24316033

Citation

Saragat, Bruno, et al. "Specific Bioelectrical Impedance Vector Reference Values for Assessing Body Composition in the Italian Elderly." Experimental Gerontology, vol. 50, 2014, pp. 52-6.
Saragat B, Buffa R, Mereu E, et al. Specific bioelectrical impedance vector reference values for assessing body composition in the Italian elderly. Exp Gerontol. 2014;50:52-6.
Saragat, B., Buffa, R., Mereu, E., De Rui, M., Coin, A., Sergi, G., & Marini, E. (2014). Specific bioelectrical impedance vector reference values for assessing body composition in the Italian elderly. Experimental Gerontology, 50, pp. 52-6. doi:10.1016/j.exger.2013.11.016.
Saragat B, et al. Specific Bioelectrical Impedance Vector Reference Values for Assessing Body Composition in the Italian Elderly. Exp Gerontol. 2014;50:52-6. PubMed PMID: 24316033.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Specific bioelectrical impedance vector reference values for assessing body composition in the Italian elderly. AU - Saragat,Bruno, AU - Buffa,Roberto, AU - Mereu,Elena, AU - De Rui,Marina, AU - Coin,Alessandra, AU - Sergi,Giuseppe, AU - Marini,Elisabetta, Y1 - 2013/12/03/ PY - 2013/07/28/received PY - 2013/10/15/revised PY - 2013/11/26/accepted PY - 2013/12/10/entrez PY - 2013/12/10/pubmed PY - 2014/9/17/medline KW - Aging KW - BIA KW - BIVA KW - Bioelectrical values KW - Body composition KW - Classic BIVA KW - DXA KW - ECW/ICW KW - FFM KW - FFMI KW - FM KW - FM% KW - FMI KW - R KW - Rsp KW - SMI KW - Specific BIVA KW - Tolerance ellipses KW - Xc KW - Xcsp KW - Z KW - Zsp KW - bioelectrical impedance analysis KW - bioelectrical impedance vector analysis KW - dual-energy X-ray absorptiometry KW - extracellular/intracellular water ratio KW - fat mass KW - fat mass index KW - fat mass percentage KW - fat-free mass KW - fat-free mass index KW - impedance KW - impedivity KW - reactance KW - reactivity KW - resistance KW - resistivity KW - skeletal muscle mass index SP - 52 EP - 6 JF - Experimental gerontology JO - Exp. Gerontol. VL - 50 N2 - 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 [Rsp] and reactivity [Xcsp], 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=1.1H. RESULTS: Descriptive statistics were: Rsp (391.8±57.9), Xcsp (42.6±9.9), Zsp (394.2±58.2), phase angle (6.2°±1.2) in men; Rsp (462.0±80.1), Xcsp (47.9±11.2), Zsp (464.6±80.5), phase angle (5.9°±1.0) in women. The Xcsp 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 Rsp and Zsp 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. SN - 1873-6815 UR - https://www.unboundmedicine.com/medline/citation/24316033/Specific_bioelectrical_impedance_vector_reference_values_for_assessing_body_composition_in_the_Italian_elderly_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0531-5565(13)00345-8 DB - PRIME DP - Unbound Medicine ER -