Department of Environmental and Life Sciences, Anthropological Science Section, University of Cagliari, Cittadella Universitaria, 09042 Monserrato (Cagliari), Italy.
J Nutr Health Aging. 2013;17(6):515-21. doi: 10.1007/s12603-012-0411-7.
This study aimed to ascertain the efficacy of bioelectrical impedance vector analysis (BIVA) in assessing body composition in the elderly by comparing findings with the results of dual-energy X-ray absorptiometry (DXA), and to test an analytical variant of the method (specific BIVA).
Cross-sectional study.
The sample comprised 207 free-living elderly individuals (75 men and 132 women) aged 65 to 93 years.
Anthropometric and bioelectrical measurements were taken according to standard criteria. BIVA was applied using the 'classic' procedure and correcting bioelectrical values for body geometry to obtain an estimate of the whole-body impedivity. DXA was used as a reference body composition assessment method. BIVA (classic and specific values) and DXA findings were compared using Student's t and Hotelling's T2 tests, and Pearson's correlation coefficient.
In both sexes, BIVA distinguished between individuals with different amounts of fat and fat-free mass (lean mass including bone mineral content), according to DXA, but not between those with different proportions of fat mass (FM%). Specific bioelectrical values detected changes in body composition.
BIVA should be used with caution for evaluating body composition in the elderly. Specific bioelectrical values proved effective, showing promise as a methodological variant of BIVA, suitable for identifying age-related changes in body fatness.
本研究旨在通过与双能 X 射线吸收法（DXA）的结果进行比较，确定生物电阻抗向量分析（BIVA）在评估老年人身体成分方面的功效，并测试该方法的分析变体（特定 BIVA）。
横断面研究。
样本由 207 名居住在社区的 65 至 93 岁的老年人（75 名男性和 132 名女性）组成。
根据标准标准进行人体测量和生物电阻抗测量。应用 BIVA 采用“经典”程序，并校正生物电阻抗值以获得全身电阻率的估计值。DXA 被用作参考身体成分评估方法。使用学生 t 检验和 Hotelling 的 T2 检验以及 Pearson 相关系数比较 BIVA（经典和特定值）和 DXA 结果。
在男性和女性中，BIVA 根据 DXA 区分了具有不同脂肪和无脂肪质量（包括骨矿物质含量的瘦质量）量的个体，但不能区分具有不同脂肪量（FM%）比例的个体。特定的生物电阻抗值检测到身体成分的变化。
在评估老年人的身体成分时，BIVA 的使用应谨慎。特定的生物电阻抗值被证明是有效的，作为 BIVA 的一种方法变体，具有识别与年龄相关的体脂肪变化的潜力。
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