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- Title
Validity of the bioelectrical impedance method for assessing body composition in non-frail and pre-frail older adults.
- Authors
Nemoto, Miyuki; Yabushita, Noriko; Mi-ji Kim; Matsuo, Tomoaki; Seino, Satoshi; Songee Jung; Sasai, Hiroyuki; Tanaka, Kiyoji
- Abstract
Objective: There are few studies testing the accuracy of bioelectrical impedance analysis (BIA) as a method for detecting body composition in older adults, including the pre-frail. This study compares body composition measured with BIA and dual X-ray absorptiometry (DXA) in non-frail and pre-frail older adults. Methods: We recruited 166 participants including 60 older adults (75.0 ± 5.7 years, 65-88 years, 41 women and 19 men) classified, according to Fried's definition, as non-frail (34 older adults, 74.5 ± 6.6 years) and pre-frail (26 older adults, 75.5 ± 4.5 years). Fat mass (FM) and fat-free mass (FFM) were estimated by DXA (DPX-LIQ, GE Healthcare) and BIA (MC-190, Tanita, Japan). We also compared this data with 106 healthy adults (39.4 ± 12.4 years, 20-64 years, 55 men and 51 women). Results: There were no differences between BIA and DXA results for FM in the non-frail and FFM in the pre-frail. However, significant differences were observed for FM in the pre-frail and FFM in the non-frail (FMBIA:18.4±5.6, FMDXA:16.9±5.0; FFMBIA:40.9±7.3, FFMDXA:40.0±6.7, P < 0.05, respectively). The DXA and BIA-derived body composition parameters correlated significantly with each other in the nonfrail and pre-frail (FM: r = 0.94, 0.97 and FFM: r = 0.98, 0.97, all P < 0.01, respectively). Bland-Altman plots demonstrated that there was a tendency towards an increasing overestimation of FM by BIA with increasing FM (r = -0.39, P = 0.05). In younger group, excellent correlation was observed between BIA and DXA (FM: r = 0.93, FFM = 0.98, P < 0.01, respectively). FMBIA tended to be overestimated with increasing FM (r = -0.27, P = 0.05) in Bland-Altman analysis. Conclusion: As compared to the DXA method, we found the BIA accurately assessed body composition in non-frail and pre-frail older adults, although FM had proportional bias. The accuracy of BIA did not differ between the younger and the elderly population.
- Subjects
BIOELECTRIC impedance; FRAIL elderly; HUMAN body composition; ELDER care; DUAL-energy X-ray absorptiometry; GENDER; STATISTICAL correlation
- Publication
International Journal of Body Composition Research, 2012, Vol 10, Issue 2, p55
- ISSN
1479-456X
- Publication type
Article