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13.2 Technical data, bioimpedance analysis
Measuring method
Electrode type
Measuring frequencies
Measured values
Phase angle measuring range
Impedance measuring range
Measuring segments
Measuring current
Measurement duration:
frequencies 5 kHz and 50 kHz
all frequencies (only if
Accuracy at frequencies 5 kHz and 50 kHz
Segments: right side of body, left side of body
• Impedance (at phase angle 0°)
• Phase angle (at phase angle 0°, impedance 200 Ω to 1000 Ω)
Evaluation parameters
Measure of certainty (R
Ethnicity:
Caucasian
2
Parameter
R
FFM
0.96
TBW
0.95
ECW
0.84
SMM
0.88
left arm
SMM
0.85
right arm
SMM
0.55
left leg
SMM
0.70
right leg
SMM
0.89
total
VAT
0.89
a. In the USA, a study was conducted with 130 healthy adults of different ethnicities. The aim of the study was to validate the
parameters determined using seca formulas against clinically established reference methods. The results of this comparative
study are shown in the table above. The table shows the degree of certainty (R
eters determined using seca's formulas by ethnicity.
72 •
Technical data, bioimpedance analysis
Raw data for impedance
2
) and standard deviation (SEE) for predictive formulas in this device
Ethnicity:
African-American
2
SEE
R
2.17 kg
0.95
2.41 kg
1.8 l
0.97
1.1 l
0.90
0.18 kg
0.81
0.27 kg
0.21 kg
0.80
0.26 kg
0.78 kg
0.73
0.70 kg
0.66 kg
0.80
2.0 kg
0.90
0.5 l
0.61
module active)
Ethnicity:
Asian
2
SEE
SEE
R
0.95
1.92 kg
1.4 l
0.96
1.3 l
0.8 l
0.91
0.7 l
0.82
0.19 kg
0.83
0.18 kg
0.37
0.75 kg
0.6 kg
0.60
0.63 kg
2.2 kg
0.85
2.0 kg
0.7 l
0.71
0.6 l
8-point bioimpedance analysis
Stainless steel, 2 x 3 pairs of hand
electrodes, 2 pairs of foot electrodes
1; 1.5; 2; 3; 5; 7.5; 10; 15; 20; 30; 50;
75; 100; 150; 200; 300; 500; 750;
1000 kHz
Impedance (Z), resistance (R),
reactance (X
), phase angle (φ)
c
Right arm, left arm, right leg, left leg,
right side of body, left side of body,
torso
100 μ (+20 %, -50 %)
See "Evaluation parameters" from
page 47
Ethnicity:
South/Central
American
2
SEE
R
0.95
1.85 kg
0.95
1.3 l
0.90
0.7 l
0.89
0.14 kg
0.90
0.13 g
0.25
0.74 kg
0.50
0.63 kg
0.88
1.8 kg
0.54
1.2 l
2
) and standard deviation (SEE) for the param-
0° to 20°
10 Ω to 1000 Ω
max. 20 s
max. 90 s
±5 Ω
0.5°
a
Ethnicity:
other
2
SEE
R
0.96
2.07 kg
0.96
1.4 l
0.90
0.8 l
0.86
0.2 kg
0.86
0.20 kg
0.64
0.74 kg
0.75
0.63 kg
0.90
2.0 kg
0.75
0.8 l
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