Abstract
The present chapter clarifies some of the basic concepts of bioimpedance and discusses its significance with regard to biophysical models and their limitations. The focus is on bioimpedance body composition models, which have become popular under the term Bioelectrical Impedance Analysis (BIA) and Bioelectrical Impedance Spectroscopy (BIS). The intention is to provide the novice reader who is unfamiliar with biophysics, electromagnetics, and circuit theory with a comprehensive, easy-to-follow, and interdisciplinary introduction to the technical and biophysical concepts underlying current BIA and BIS techniques. Such knowledge is considered important to carefully perform and interpret bioimpedance results in clinical and research settings. The main sections of the chapter build on each other in a logical order, but can also be used independently as future reference by the experienced reader. In brief, the present chapter starts with an explanation of the raw data obtained from bioimpedance measurements. This serves as a basis for reviewing the passive electrical properties of human cells and tissue and for showing how these properties can be represented by electrical equivalent circuits. This goes on to explain the frequency-dependent nature of the electrical properties of biological tissue and clarify the differences between single-frequency, multi-frequency BIA, and BIS. Subsequently, safety considerations and general measurement principles such as electrode arrangements are also addressed in order to highlight how deep-tissue measurements can be obtained non-invasively without the use of needle electrodes. This is followed by a detailed outline of the fundamental biophysical model underlying most bioimpedance body composition applications. The weak points of present biophysical models are identified by comparing conventional whole-body BIA approaches to alternative techniques such as proximal electrode configurations or segmental measurements. Examples are used to show how to improve segmental measurements by performing multiple measurements along the limbs, thus “slicing” the limbs in various cross-sections such as during MRI scanning. Finally, the chapter assesses the reliability of bioimpedance measurements by discussing several endogenous and exogenous sources of error, and concludes with a guideline for standardizing bioimpedance measurement procedures. This serves as the basis for a discussion of selected applications in the following chapters on bioelectrical impedance and is therefore intended to complement each other.
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Notes
- 1.
Equipotential lines indicate points with identical potentials. If an electrical charge is moved along an equipotential line, it experiences no electric force and hence no work is performed. Since there is no force driving the charges, there is no current flow between two points with the same potential.
Abbreviations
- Latin :
-
letters
- A :
-
Area [m2]
- BIA:
-
Bioelectrical Impedance Analysis
- BIS:
-
Bioelectrical Impedance Spectroscopy
- C :
-
Capacitance [F]
- C m :
-
Membrane capacitance [F]
- f :
-
Frequency [Hz]
- f c :
-
Characteristic frequency [Hz]
- l :
-
Length [m]
- L:
-
Liter
- R :
-
Resistance [Ω]
- R 0 :
-
Resistance at zero frequency [Ω]
- R ∞ :
-
Resistance at infinite frequency [Ω]
- R e :
-
Extracellular resistance [Ω]
- R i :
-
Intracellular resistance [Ω]
- V :
-
General volume [L]
- X :
-
Reactance [Ω]
- X c :
-
Capacitive reactance [Ω]
- Z :
-
General impedance (magnitude) [Ω]
- Greek :
-
letters
- ρ :
-
Resistivity [Ω·m]
- ε :
-
Permittivity [F·m-1]
- σ :
-
Conductivity in general [S·m-1]
- τ :
-
Time constant [s]
- ϕ :
-
Phase angle [°]
- ω :
-
Angular frequency (2πf) [Hz]
- Ω:
-
Ohm
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Stahn, A., Terblanche, E., Gunga, HC. (2012). Use of Bioelectrical Impedance: General Principles and Overview. In: Preedy, V. (eds) Handbook of Anthropometry. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1788-1_3
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