Apparatus and method for measuring bio-impedance

Abstract

The invention provides an apparatus and a method for measuring bio-impedance. The apparatus for measuring bio-impedance applies signals on a drive electrode, separates signals output from a readout electrode according to different frequency components and calculates the bio-impedance, wherein the applied signals synthesize a sine wave signal with a plurality of frequency according to a superposition principle and meanwhile the apparatus measures various frequency, thus shortening the measuring time. Additionally, the apparatus and method eliminate primary factor of the measuring error such asactivity of measured people in a long-term measuring process and ensure the measuring to be correct and reliable.

Description

technical field [0001] The invention relates to a device for measuring biological impedance. Background technique [0002] In order to measure body fat and the like, measuring devices for bioimpedance are widely used. In the composition of the body, muscle has more water, but fat has no water. Therefore, the bioimpedance value is lower with more muscle and higher with more fat. By measuring the bioimpedance value, the body water content, muscle mass, and fat mass of the subject can be obtained simply and with high reproducibility. [0003] This device measures bioimpedance by attaching electrodes to body parts, such as both hands and feet, selecting a pair of the electrodes according to the measurement site, applying a current signal for measurement, and selecting an appropriate electrode according to the measurement site Yes, measure the voltage across it. For example, by measuring the voltage drop from the left wrist to the left foot after applying a current from the l...

AI Technical Summary

Problems solved by technology

[0006] In this way, the conventional bioimpedance measurement technology has the problem that it takes a long time to measure because the process of signal application and measurement must be repeated several times for various frequency components.

In addition, during the long measurement time, when the subject moves or speaks, the measurement conditions change in different frequency components, and thus there is a problem that the measurement error increases.

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