Body parameter estimation method and body parameter measuring device

Abstract

By use of a parameter representing an intracellular / extracellular fluid ratio which is included in a parameter value associated with a bioelectric impedance measured at a given frequency or a parameter value associated with a bioelectric impedance measured at other frequency, the parameter value associated with the measured bioelectric impedance is corrected, and a body composition and the like are estimated based on the corrected parameter value associated with the bioelectric impedance. Further, the parameter to be corrected which is associated with the bioelectric impedance is the absolute value of the bioelectric impedance, a bioelectric impedance vector value or the resistance component value of the bioelectric impedance vector.

Description

Background technique [0001] (i) Technical field [0002] The invention relates to the improvement of the accuracy of a bioelectrical impedance detection method, and a body composition detection device based on the bioelectrical impedance detection method. [0003] (ii) Description of related technologies [0004] The bioelectrical impedance detection method evaluates body composition based on the following principle. [0005] Assuming that a part of the living body through which the current easily passes is expressed as figure 1 The cylindrical conductive material shown. In addition, when the length, cross-sectional area, resistivity and volume of the conductive material such as figure 1 Shown as L, S, ρ and V, respectively, the resistance R between the upper and lower end faces of the conductive material and the volume V are expressed as follows. [0006] R=αL / S [0007] V=SL [0008] However, since the cross-sectional area S is expressed as: [0009] S=V / L, [0010]...

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Problems solved by technology

This calculation is time consuming since the arc trajectory of the impedance must be determined

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