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About body fat measurement
Principles of body fat percentage measurement
Omron Body Fat Monitor measures the body fat percentage by the Bioelectrical
Impedance (BI) method.
What is Bioelectrical impedance (BI) Method?
Tissues containing much water such as muscles, blood vessels, and bones are
highly conductive with electricity, but fat tissues are not.
Therefore, by using this principle, it is possible to determine the ratio of fat
tissue compared to other tissues in the body by measuring the electric
resistance of the body tissues,using extremely weak electric current
applications to the body. As the electric current applied to the human body
during the body fat measurement is extremely weak, of about 50 KHz to
500 µA, one will not feel the electric stimulation, and this method is safe for
the human body.
The electric resistance is determined by “facilitation of electric conductivity”
and the “distance of the electricity conduction.” In order to find “facilitation of
electric conductivity” for estimating the ratio of fat, it is necessary to always keep
the “distance of the electricity conduction” at the same level.
That is why we must maintain a correct posture during the measurement.
How to measure the body fat percentage
To calculate the body fat percentage (fat information of whole body) from
the electric conductivity between both hands, the following five items
(1) electric resistance, (2) height, (3) weight, (4) age, and (5) gender and a
formula are employed.
This formula is formulated by OMRON using the basic data on human body,
obtained from several hundreds people. By referring to the accumulated
basic data, the body fat percentage is estimated from the conditions specific
to users (5 items).
This basic data is obtained by “Under-water weighing method”, which is
considered the most accurate body fat measurement method at present.
EN-02-19[HBF306]-15 7/5/05, 11:08 AM5