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Concordance between dual indirect methods for assessing fat percentage.

Hurtado B¹, Colina E², Gonzalez-Correa C H³

¹Clinical Department, University of Caldas, Manizales, Colombia.

Journal of Electrical Bioimpedance

|April 8, 2024

Summary

Two low-cost body fat measurement methods show good correlation but poor agreement, limiting their interchangeable use for individual tracking. Moderate physical activity in young adults may allow for interchangeable use.

Keywords:

adipose tissue anthropometry body composition electrical impedance

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Area of Science:

Human body composition analysis
Health sciences
Sports science

Background:

Human body composition assessment is crucial in healthcare, sports, and population studies.
Fat percentage is linked to various diseases, yet measurement discrepancies exist between methods.

Purpose of the Study:

Evaluate concordance between two accessible, low-cost body fat measurement methods.
Determine fat percentage and its relationship with age, sex, BMI, waist circumference, physical activity, and sedentary hours.

Main Methods:

Anthropometry (digital adipometer) and Bioelectrical Impedance Analysis (BIA) were used to estimate fat percentage.
Participants (18-59 years) from a university community were assessed.
Pearson's correlation, Bland & Altman plots, and Lin's concordance index were calculated.

Main Results:

Anthropometry yielded higher fat percentages (30.5-35.0%) than BIA (27.0-29.2%).
Both methods showed strong correlation but low concordance (Lin's index < 0.9), except in young adults with moderate activity (0.95).

Conclusions:

Doubly indirect methods for fat percentage measurement exhibit strong correlation but poor concordance, advising against interchangeable use for individual case follow-up.
In young adults with moderate physical activity, either anthropometry or BIA may be suitable for tracking body fat.