Measurements of body fluid volumes
Jafrin et al [7] evaluated the potential of a Tefal BodyMaster FFI to measure ECW, FFM and FM by- comparison with a multi-frequency Xitron Hydra 4200 on 60 volunteers (30 men and 30 women) aged from 18 to 71 yrs. he use of multi-frequency and the conductivity theory of Hanai [8] in bioimpedance spectroscopy (BIS) permit a more precise calculation of TBW and therefore of FFM since the two parameters are connected. However, it is clear that the same equations for ECW and FFM cannot be used with both impedance meters as the XITRON measures the wrist-ankle resistance in supine position and the Tefal, the foot-to-foot one in standing position. herefore the authors choose a Hologic QDR Delphi DXA as a reference method. Subjects undressed and wore a light gown. Ater standing during 12 min to avoid luid shits due to change in posture, TBW was measured by the Xitron and FFM was calculated as TBW/0.732. Mean FFM diferences between Tefal and DXA data were 1.57 ± 3.09 kg for men and -0.08 ± 2.98 kg for women. Mean diferences between Xitron–measured and DXA-measured were 0.21 ± 3.03 kg for men and 0.15 ± 2.40 for women indicating a slight overestimation by the Xitron. Concerning the measurement of ECW by the Tefal, extracellular resistance measured by Tefal Ret and the resistances measured by the Xitron Ref. Equations for extracellular volume Ve were, for the Xitron.
Ve= ke (H W
/Re)
3a)
And for the Tefal
2 0.5
2/3
Vet = kt (H W
/Ret)
(3b)
The low frequency resistance Ret of the Tefal was not signiicantly diferent (8.5 ± 31 Ω) from the ECW resistance Re measured by the Xitron (Eq. 3a) with the same electrode position, under the feet. The diference between Ve and Vet was only -0.09 ± 0.66 L. Mean values and SD of Xitron and Tefal resistances
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