Body Composition Analyses in Older Adults May Vary Significantly Depending on the Bioelectrical Impedance Analyzer Modality

This study aimed to investigate the effects of aging on body composition analyses detected by a single-frequency (SF-BIA) and a multifrequency bioelectrical impedance analyzer (MF-BIA). Forty older patients and 42 young subjects were included in the study. Body composition was measured using an SF-BIA and an MF-BIA consecutively. Significant differences were found between the analyses of SF-BIA and MF-BIA in older patients. Handgrip strength values were found to correlate more strongly with the skeletal muscle mass index detected by MF-BIA. MF-BIA may be preferable to SF-BIA in older adults due to its higher correlation coefficient with handgrip strength.