Product Manual

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