Journal of Applied Physiology Journal of Applied Physiology
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J Appl Physiol 82: 704-710, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 2, pp. 704-710, February 1997
SYSTEMIC CIRCULATION AND FLUID BALANCE

special communication

Assessing total body and extracellular water from bioelectrical response spectroscopy

Steven F. Siconolfi1, Randal J. Gretebeck2, William W. Wong3, Robert A. Pietrzyk4, and Sheril S. Suire2

1 Exercise Physiology Laboratory, Space Biomedical Research Institute, National Aeronautics and Space Administration, Johnson Space Center, Houston 77058; 2 University Space Research Association, Houston 77058; 3 Stable Isotope Program, United States Department of Agriculture/ Agricultural Research Service Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston 77030; 4 Biochemistry Research Laboratory, KRUG Life Sciences, Biomedical Operations and Research Branch, National Aeronautics and Space Administration, Houston, Texas 77058

Received 21 November 1994; accepted in final form 11 July 1996.

Siconolfi, Steven F., Randal J. Gretebeck, William W. Wong, Robert A. Pietrzyk, and Sheril S. Suire. Assessing total body and extracellular water from bioelectrical response spectroscopy. J. Appl. Physiol. 82(2): 704-710, 1997.---We developed and validated assessments for total body water (TBW) and extracellular water (ECW) by using two resistance values of a new electric circuit model (CM) (two resistors: a capacitor and an inductor) with or without body mass. Fluid shifts occurring after 40 min of supine rest did not decrease the validity of either estimate. CM estimates were valid; r = 0.941 to 0.969, low SE of estimates of 1.15-2.28 kg, nonsignificant mean differences (CM - dilution; %Delta  = -0.4 to 1.3%) that were close to the expected measurement errors for TBW (±1%) and ECW (±5%), and Bland-Altman pairwise comparisons that showed equivalence between methods. The CM estimates of TBW and ECW had marginally better validity than the previously published bioimpedance models. The advantage of the CM model is its assessments of multiple fluid spaces and that it does not require gender-specific equations. We conclude that CM estimate of TBW is acceptable, whereas further validation is needed before the ECW estimate should be used in a clinical or research setting.

bioimpedance; frequency; body fluids




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