Product Manual

Medical basis • 47
English
seca therefore developed its own predictive formulas for determining the
following parameters for the arms and legs:
• total body water (TBW)
• extracellular water (ECW)
• fat-free mass (FFM)
• skeletal muscle mass (SMM) for arms, legs, torso and whole body
In-house reference values were determined for the following parameters in
order to be able to show normal ranges:
• bioimpedance vector analysis (BIVA)
• mass indices (FMI, FFMI)
• phase angle (φ)
In order to determine the formulas and reference values, there was close col-
laboration with the Institute for Human Nutrition and Food Studies at the
University of Kiel and joint representative studies were conducted.
In contrast to all formulas published to date, the seca formulas are popula-
tion-specific. The formulas developed in Kiel apply solely to Caucasian
population groups.
Representative surveys were also conducted in the USA in collaboration with
the New York Obesity Nutrition Research Center at St. Luke’s Roosevelt
Hospital. seca formulas for African-American, South/Central American and
Asian population groups were developed on the basis of this study.
The seca formulas are implemented only in seca mBCA devices and seca PC
software. As such, seca is a pioneer in the well-founded scientific and medi-
cally significant determination of body composition by means of bioimped-
ance analysis.
6.2 Evaluation parameters
Summary of evaluation parameters With seca, the parameters required for assessing body composition are
called evaluation parameters. The table provides an overview of the evalua-
tion parameters of the seca 515/514.
On the device and in the
seca 115 PC software, the evaluation parameters are
grouped into evaluation modules. This allows certain aspects of body compo-
sition to be assessed specifically (see "Evaluation modules" from page 50).
Evaluation
parameter
Display Evaluation module
Bioimpedance
vector analysis
(BIVA)
• Normal range display of R and X
c
in
co-ordinate system in relation to height
• 50 %, 75 %, 95 % percentiles in the
form of tolerance ellipses
• “Fluid” from page 56
• “Health risk” from page 57
Body mass
index (BMI)
•Absolute in kg/m
2
• For children: shown in percentile curves
• For adults: graphic display of WHO
reference values
“Development/growth” from page 50
Extracellular
water (ECW)
Absolute in l “Fluid” from page 56
Fat-free mass
(FFM)
Absolute in kg “Function/rehabilitation” from page 54
Fat mass (FM)
•Absolute in kg
• Relative in %
• For adults: normal range display
• “Energy” from page 53
• “Function/rehabilitation” from page 54