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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship

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Learning Effects in Air Displacement Plethysmography.

Paul Muntean^1,2,3, Anca Popa¹, Monica Miclos-Balica^1,2

¹Department of Functional Sciences, "Victor Babeș" University of Medicine and Pharmacy of Timișoara, 300041 Timisoara, Romania.

Life (Basel, Switzerland)

|June 28, 2023

Summary

This summary is machine-generated.

The first air displacement plethysmography (ADP) trial may be a practice run, as reliability improves in subsequent body composition assessments. Subsequent trials show high reliability for percent body fat and fat-free mass measurements.

Keywords:

BOD POD body fat percentage body volume fat-free mass reliability

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Area of Science:

Physiology
Anthropometry
Biomedical Engineering

Background:

Air displacement plethysmography (ADP) is a common method for measuring body composition and obesity.
Previous studies confirm the general reliability of ADP through repeated measurements.
The BOD POD system is the only commercially available ADP device.

Purpose of the Study:

To assess the impact of learning effects on the reliability of body composition measurements using the BOD POD system.
To determine if initial ADP trials yield less reliable results compared to later trials.
To provide recommendations for optimizing ADP measurement protocols.

Main Methods:

Quadruplicate air displacement plethysmography (ADP) trials were conducted on 105 participants (51 women, 54 men).
Measurement error was analyzed using consecutive trial pairs: (1,2), (2,3), and (3,4).
Reliability was quantified using standard error of measurement (SEM) and intraclass correlation coefficient (ICC).

Main Results:

Reliability was lower for the first pair of trials (SEM=1.04% %BF, ICC=0.991) compared to subsequent pairs (SEM=0.71-0.66% %BF, ICC=0.996).
The first ADP trial is suggested to be a practice trial for novice subjects.
Pooled reliability indices (excluding the first trial) showed high consistency: ICC=0.996, SEM=0.70% for %BF; ICC=0.999, SEM=0.49 kg for FFM.

Conclusions:

Learning effects can influence the initial reliability of body composition assessment via ADP.
Treating the first ADP trial as a practice session can enhance overall measurement accuracy.
Eliminating learning effects is crucial for maximizing the reliability of ADP measurements in research and clinical settings.