Comparing measures of fat-free mass in overweight older adults using three different bioelectrical impedance devices and three prediction equations

Ramsey, Rebecca, Isenring, Elizabeth, & Daniels, Lynne (2012) Comparing measures of fat-free mass in overweight older adults using three different bioelectrical impedance devices and three prediction equations. Journal of Nutrition, Health and Aging, 16(1), pp. 26-30.

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Objectives: To compare measures of fat-free mass (FFM) by three different bioelectrical impedance analysis (BIA) devices and to assess the agreement between three different equations validated in older adult and/or overweight populations.

Design: Cross-sectional study.

Setting: Orthopaedics ward of Brisbane public hospital, Australia.

Participants: Twenty-two overweight, older Australians (72 yr ± 6.4, BMI 34 kg/m2 ± 5.5) with knee osteoarthritis.

Measurements: Body composition was measured using three BIA devices: Tanita 300-GS (foot-to-foot), Impedimed DF50 (hand-to-foot) and Impedimed SFB7 (bioelectrical impedance spectroscopy (BIS)). Three equations for predicting FFM were selected based on their ability to be applied to an older adult and/ or overweight population. Impedance values were extracted from the hand-to-foot BIA device and included in the equations to estimate FFM.

Results: The mean FFM measured by BIS (57.6 kg ± 9.1) differed significantly from those measured by foot-to-foot (54.6 kg ± 8.7) and hand-to-foot BIA (53.2 kg ± 10.5) (P < 0.001). The mean ± SD FFM predicted by three equations using raw data from hand-to-foot BIA were 54.7 kg ± 8.9, 54.7 kg ± 7.9 and 52.9 kg ± 11.05 respectively. These results did not differ from the FFM predicted by the hand-to-foot device (F = 2.66, P = 0.118).

Conclusions: Our results suggest that foot-to-foot and hand-to-foot BIA may be used interchangeably in overweight older adults at the group level but due to the large limits of agreement may lead to unacceptable error in individuals. There was no difference between the three prediction equations however these results should be confirmed within a larger sample and against a reference standard.

Impact and interest:

7 citations in Scopus
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5 citations in Web of Science®

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ID Code: 55122
Item Type: Journal Article
Refereed: Yes
Keywords: Body composition, Bioelectrical impedance spectroscopy (BIS), Bioelectrical impedance analysis (BIA), Older adults
DOI: 10.1007/s12603-011-0085-6
ISSN: 1279-7707
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > NUTRITION AND DIETETICS (111100) > Clinical and Sports Nutrition (111101)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Exercise & Nutrition Sciences
Copyright Owner: Copyright 2012 Springer-Verlag
Copyright Statement: The original publication is available at SpringerLink
Deposited On: 26 Nov 2012 22:14
Last Modified: 27 Nov 2012 13:16

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