Evaluation of foot-to-foot bioelectrical impedance analysis for the prediction of total body water in oncology outpatients receiving radiotherapy

Isenring, Elisabeth A., Bauer, Judith D., Capra, Sandra, & Davies, Peter S. (2004) Evaluation of foot-to-foot bioelectrical impedance analysis for the prediction of total body water in oncology outpatients receiving radiotherapy. European Journal of Clinical Nutrition, 58(1), pp. 46-51.

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Objective: To investigate the accuracy of total body water (TBW) predicted by foot-to-foot bioelectrical impedance compared with a deuterium oxide dilution technique in oncology outpatients receiving radiotherapy. Design: Cross-sectional design Setting: Two private Australian radiation oncology facilities. Subjects: Twenty-seven subjects (23 male; 4 female) mean age 62 (+/-15) years; mean BMI 26.2 kg/m2 (+/- 3.6). Intervention: TBW was measured using a deuterium oxide dilution technique and predicted using foot-to-foot bioelectrical impedance (Tanita Inc, Tokyo, Japan Models TBF 410 and 300GS). Results: The mean (SD) values for predicted and measured TBW was 41.5 (6.7) l and 39.7 (8.7) l respectively, indicating a mean bias to overestimation by the foot-to-foot impedance of 1.8 l. However, a significant negative correlation between the mean of the measurements of TBW and their difference (r=-0.40; p=0.04) indicates a progressive underestimation of TBW by foot-to-foot impedance as the water content of the body increases. The analysis of 95% limits of agreement (+/- 2SD) showed that for most individuals the TBW predicted by foot-to-foot impedance can vary as much as 12 l above or 8.6 l below the actual TBW measured by a deuterium oxide dilution technique. Conclusion: There is good agreement between foot-to-foot bioelectrical impedance with a gold standard technique at the group level. However, the significant correlation between the difference of predicted and measured TBW, and the wide limits of agreement between the two methods, indicates that the use of foot-to-foot impedance in assessing TBW may lead to unacceptable error in individuals.

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ID Code: 8287
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author.
Author contact details: e.isenring@qut.edu.au
Keywords: foot, to, foot bioelectrical impedance, total body water, body composition, cancer
DOI: 10.1038/sj.ejcn.1601744
ISSN: 0954-3007
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700)
Divisions: Past > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2004 Nature Publishing Group
Deposited On: 26 Jun 2007 00:00
Last Modified: 29 Feb 2012 13:06

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