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Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
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Reliability for multiple frequency bioelectric impedance.

Wm Cameron Chumlea1, Shumei S Guo2, Anna Bellisari3

  • 1Division of Human Biology, Departments of Community Health and Pediatrics, Wright State University, Dayton, Ohio 45435.

American Journal of Human Biology : the Official Journal of the Human Biology Council
|May 27, 2017
PubMed
Summary
This summary is machine-generated.

Multifrequency bioelectric impedance measurements show high observer reliability for quantifying body fluid compartments, especially at lower frequencies. Resistance measurements in men were more reliable than in women.

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Area of Science:

  • Physiology
  • Biomedical Engineering
  • Body Composition Analysis

Background:

  • Multifrequency bioelectric impedance (MF-BIA) is a method for assessing body fluid compartments and hydration status.
  • Traditional bioelectric impedance analysis (BIA) often uses a single frequency (50 kHz), with established low observer error.
  • Investigating MF-BIA reliability across a broader frequency range is crucial for its clinical application.

Purpose of the Study:

  • To evaluate the observer reliability of multifrequency impedance measurements across 15 frequencies (5–1,300 kHz).
  • To assess the influence of frequency, sex, and age on measurement reliability.
  • To determine optimal frequency ranges for reliable resistance and reactance measurements.

Main Methods:

  • Twenty White subjects of each sex (18–65 years) underwent MF-BIA measurements at 15 frequencies (5–1,300 kHz).
  • Measurements were taken by two observers across two separate time periods to assess intra- and inter-observer reliability.
  • Coefficients of reliability were calculated to quantify measurement consistency.

Main Results:

  • High intra- and inter-observer reliability (>95%) was observed for resistance below ~500 kHz and reactance below ~100 kHz.
  • Measurement reliability decreased at higher frequencies, particularly for reactance.
  • Resistance measures were more reliable in men than in women; age did not affect reliability.

Conclusions:

  • MF-BIA demonstrates high observer reliability for body fluid quantification, particularly at lower frequencies.
  • Specific frequency ranges are recommended for optimal resistance and reactance measurements to ensure accuracy.
  • Sex influences the reliability of resistance measurements, with men showing greater consistency.