Determination of Cole parameters in multiple frequency bioelectrical impedance analysis using only the measurement of impedances.

Abstract:

:Conventional bioimpedance spectrometers measure resistance and reactance over a range of frequencies and, by application of a mathematical model for an equivalent circuit (the Cole model), estimate resistance at zero and infinite frequencies. Fitting of the experimental data to the model is accomplished by iterative, nonlinear curve fitting. An alternative fitting method is described that uses only the magnitude of the measured impedances at four selected frequencies. The two methods showed excellent agreement when compared using data obtained both from measurements of equivalent circuits and of humans. These results suggest that operational equivalence to a technically complex, frequency-scanning, phase-sensitive BIS analyser could be achieved from a simple four-frequency, impedance-only analyser.

journal_name

Physiol Meas

authors

Ward LC,Essex T,Cornish BH

doi

10.1088/0967-3334/27/9/007

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

839-50

issue

9

eissn

0967-3334

issn

1361-6579

pii

S0967-3334(06)18497-X

journal_volume

27

pub_type

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