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BIOELECTRICAL IMPEDANCE ANALYSIS

Last modified: 2017-07-31

#### Abstract

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.

(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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