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Bode Plots Construction01:24

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The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
657

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Bioelectrical impedance vector (BIVA) reference values for healthy term newborns 1-2 days old.

Nallely Bueno-Hernández1, Jesús Carlos Briones-Garduño2, Miguel Ángel Fonseca-Sánchez1

  • 1Laboratorio de Proteómica e Inmunometabolismo, Hospital General de México "Dr. Eduardo Liceaga", Mexico City 06720, Mexico.

Clinical Nutrition ESPEN
|February 16, 2025
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Summary

Bioelectrical impedance vector analysis (BIVA) reference values for newborns were established. Significant differences were found compared to other populations, potentially due to ethnicity or BIVA assessment techniques.

Keywords:
BIABIVABioelectrical impedance vector analysisBody compositionNewbornsPhase angle

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Area of Science:

  • Physiology
  • Biomedical Engineering

Background:

  • Bioelectrical impedance vector analysis (BIVA) assesses body fluids and nutritional status using reference ellipses.
  • Population-specific BIVA ellipses are influenced by ethnicity, BMI, sex, and age.

Purpose of the Study:

  • To establish BIVA reference values for healthy, term newborns aged 1-2 days.
  • To compare these values with previously reported newborn populations.

Main Methods:

  • A cross-sectional study collected bioelectrical impedance data from healthy, term newborns within 48 hours of birth.
  • Mean impedance vector tolerance ellipses (50%, 75%, 95%) were constructed.

Main Results:

  • Significant differences in mean impedance vectors were observed between populations.
  • Similarities were found only with one of the four previously reported populations.
  • No differences were linked to mode of delivery or newborn sex.

Conclusions:

  • BIVA reference ellipses for healthy term newborns (1-2 days) were successfully constructed.
  • Observed differences suggest ethnic influences or variations in BIA assessment techniques impact BIVA ellipses in newborns.