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Specific Bioelectrical Vector Reference Values for Italian Adults: A Multicentre Study.

Federica Frau1, Eduardo Pizzo Junior1, Valeria Succa1

  • 1Department of Life and Environmental Sciences, University of Cagliari, 09042 Monserrato, Italy.

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|February 20, 2026
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Summary
This summary is machine-generated.

This study defines specific bioelectrical reference values for Italian adults, crucial for assessing body composition in clinical and sports settings. The findings provide new tools for evaluating body composition in diverse populations.

Keywords:
BIVAathletesbioelectrical impedance vector analysisbody compositionmalnutrition

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Area of Science:

  • Human Physiology
  • Bioelectrical Impedance Analysis
  • Anthropometry

Background:

  • Lack of specific bioelectrical reference values for Italian adults hinders accurate body composition assessment.
  • Bioelectrical impedance analysis (BIA) is a non-invasive method for estimating body composition.
  • Establishing population-specific reference ranges is essential for clinical and sports applications.

Purpose of the Study:

  • To define specific bioelectrical reference values for Italian adults.
  • To test the suitability of these values in pathological cases (obesity, anorexia nervosa) and competitive athletes.
  • To create a comprehensive reference dataset for individuals aged 18-100 years.

Main Methods:

  • A sample of 1049 Italian adults (aged 30-65) was analyzed for anthropometric and bioelectrical variables.
  • Calculated resistivity, reactivity, impedivity, and phase angle (PhA).
  • Utilized two-way ANOVA and Hotelling's T2 test; pooled data with existing datasets for broader age range.

Main Results:

  • Defined specific bioelectrical variables for Italian men and women, noting significant differences in PhA and vector length.
  • Found that advancing age was associated with lower PhA and longer vectors.
  • Observed that bioelectrical vectors for individuals with obesity or anorexia nervosa fell outside the 95% variability range, while athletes' vectors were in the lower left quadrant.

Conclusions:

  • The established specific tolerance ellipses for the Italian adult population address a gap in the literature.
  • These findings provide essential new tools for evaluating body composition in clinical and sports settings.
  • The study enables comparative analyses and improves the accuracy of BIA in diverse populations.