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The mysterious values of adipose tissue density and fat content in infants: MRI-measured body composition studies
Takashi Abe1, Robert S Thiebaud2, Jeremy P Loenneke3
1Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, Oxford, MS, USA. t12abe@gmail.com.
Insights
Accurate body fat mass calculation requires consistent adipose tissue density values. This study clarifies conversion factor variations and proposes new fat content and density recommendations for infants using water-fat magnetic resonance imaging (MRI).
Area of Science:
- Biomedical Engineering
- Radiology
- Human Physiology
Background:
- Adipose tissue, composed of adipocytes storing triglycerides, is crucial for body fat mass estimation.
- Magnetic resonance imaging (MRI) measures adipose tissue volume, but requires tissue density for accurate fat mass calculation.
- Existing studies show variability in the conversion factors used for white adipose tissue density.
Purpose of the Study:
- To investigate and clarify the discrepancies in adipose tissue density conversion factors used across different studies.
- To propose updated recommendations for infant adipose tissue density and fat content based on recent water-fat MRI data.
Main Methods:
- Review and analysis of previously published studies on adipose tissue density conversion factors.
- Utilized recent water-fat magnetic resonance imaging (MRI) data specific to infant populations.
- Comparative analysis of existing and proposed adipose tissue density values.
Main Results:
- Identified significant variability in white adipose tissue density conversion factors among published studies.
- Presented new proposed values for infant adipose tissue density and fat content derived from water-fat MRI.
- Highlighted the impact of density variations on body composition measurements in infants.
Conclusions:
- Standardizing adipose tissue density is essential for accurate body composition analysis, particularly in pediatric research.
- The proposed infant-specific adipose tissue density and fat content values offer a more precise method for MRI-based body fat assessment.
- This work aims to improve the reliability of body composition measurements in infants using advanced MRI techniques.
Abstract:
Adipose tissue is a type of connective tissue composed of closely packed adipocytes with collagenous and elastic fibers. These adipocytes store triglycerides at a high percentage and the estimate of this amount is important for the calculation of body fat mass. For example, magnetic resonance imaging (MRI) measures adipose tissue volume, but adipose tissue density (fat content percentage and density) is required to calculate fat mass. However, in previously published studies, the conversion factor for white adipose tissue density varies from study to study. This paper aimed to investigate the different adipose tissue densities used as conversion factors to clarify differences between studies. Furthermore, we include a new proposal for adipose tissue density and fat content of infants based on the results of recent water-fat MRI studies. IMPACT: Magnetic resonance imaging (MRI) is one of the methods used to measure body composition in infants and the inherent density of tissue/organs is needed in order to calculate the mass of target organs and tissues. The conversion factor used for white adipose tissue density currently varies from study to study. This article includes a new recommendation for the adipose tissue density and fat content of infants based on the results of recent water-fat MRI studies.
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