International Conference of Health Polytechnic Surabaya, Seminar Nasional Kesehatan 2015

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Priyambada C. Nugraha, I Dewa Gede Hari Wisana

Last modified: 2017-07-31


Bioelectrical Impedance Analysis (BIA) is a diagnostic tool to measure total body water
(TBW) and percentage body fat (PBF). The results of these measurements are used to
determine the level of obesity. Obesity rates are needed to identify and assess the
development and nutritional status of a person. The conventional way to determine
persentage body fat (PBF) is using a calculation of body mass index (BMI), which is the
data weight (in kg) and height (in m). This tool uses four electrodes, two electrodes to
transmit at a frequency of 50KHz 500µA current for 30 seconds to body tissue (between
the wrist and ankle) and two other electrodes are used to measure voltage. Then take the
average value of the voltage of patients in accordance with Ohm's Law is assumed that if
there is an electrical current (I) passing through a resistance (R), there will be a voltage
(V) on the resistance, according to the formula V = I x R. For process data and control
the overall system used microcontroller ATmega 8535. the final results in the form of
TBW and PBF values displayed on the LCD. Experimental measurements were
performed on 5 different respondents. Respondents measured by BIA and the
conventional way. Collecting data 5 times for each respondent. The analysis showed an
average error rate (Σ% Error): respondent 1 (3:39%), respondent 2 (3.35%), respondent 3
(3.42%), respondent 4 (0.56%) and respondent 5 (3.02%).

Keywords: Bioelectrical Impedance Analysis, TBW, PBF, BMI.

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