The principles of BIA were described as early as 1935/36 by Brazier, Barnett and Horton.
The foundation stone for today's known form of impedance analysis with a body analysis scale was laid by the American researcher Nyboer around 1970. In 1994, the areas of application, benefits and reliability of BIA were defined and published for the first time by the BIA Consensus Conference under the auspices of the American "National Institute of Health NIH". Reliability and validity of BIA have been confirmed by more than 2000 scientific studies.
How do we measure?
A medically correct measurement is done lying down!
- A standing measurement is - especially with edemic patients - not useful due to the fact that it is a hydration measurement (gravitation of the water).
- The sole of the foot is the more unsuitable for measurements the older the patient is. The cornea of the sole of the foot is not conductive at all! You will not get a valid measurement from standing devices!
- The sweat glands on the palms of the hands and feet are salt-containing as a given. Since the BIA measurement is a resistance measurement, measurements from the palm and sole of the foot may falsify the measurement result significantly.
Therefore, a measurement should be taken lying down. It is recommended to lie down for at least 5 minutes before the measurement, optimal is up to 20 minutes (but mostly impracticable: the result is only marginally influenced).
We place the electrodes on the top of the feet and hands.
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Source and image source: juwell medical
Published on: 5 September 2023