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Sonographic assessment of abdominal fat distribution in infancy
Susanne Holzhauer1, Renate M L Zwijsen, Vincent W V Jaddoe
1The Generation R Study Group, Erasmus Medical Center, Rotterdam, The Netherlands. Susanne.holzhauer@charite.de
Insights
Body fat distribution, not just total fat, impacts disease risk. A new, reliable ultrasound method accurately measures infant abdominal fat, crucial for early life developmental studies.
Area of Science:
- Pediatric Endocrinology
- Medical Imaging
- Developmental Biology
Background:
- Body fat distribution is increasingly recognized as a significant factor in metabolic and cardiovascular disease risk.
- Assessing body fat distribution in infants is crucial for understanding early life development but has been limited by measurement techniques.
- Ultrasound (sonography) is a validated method for adult abdominal fat assessment, yet its application in infants requires adaptation and evaluation.
Purpose of the Study:
- To adapt and validate sonographic measurement of abdominal fat distribution in infants.
- To establish a reliable method for quantifying subcutaneous and preperitoneal fat thickness in early life.
- To investigate changes in infant body fat distribution during the first two years of life.
Main Methods:
- A population-based prospective cohort study (Generation R) included 212 one-year-olds and 227 two-year-olds.
- A standardized sonographic protocol was developed to measure subcutaneous and preperitoneal fat thickness in the infant upper abdomen.
- Reproducibility was assessed through replicate measurements in 62 infants, calculating intra- and inter-observer agreement.
Main Results:
- The developed sonographic protocol demonstrated good to excellent reproducibility, with intraclass correlation coefficients ranging from 0.89 to 0.97.
- A significant increase in preperitoneal fat thickness was observed in the second year of life, while subcutaneous fat increased minimally.
- This shift indicates an altered body fat distribution in infants during their second year, independent of gender.
Conclusions:
- The age-specific sonographic protocol for measuring central subcutaneous and preperitoneal fat in infants is a reproducible and reliable method.
- This validated technique provides a valuable tool for future research into body fat distribution and its health implications in early life.
- Understanding infant fat distribution patterns can inform early identification and prevention strategies for metabolic and cardiovascular diseases.
Abstract:
There is growing evidence that not only the total amount of fat, but also the distribution of body fat determines risks for metabolic and cardiovascular disease. Developmental studies on factors influencing body fat distribution have been hampered by a lack of appropriate techniques for measuring intraabdominal fat in early life. Sonography, which is an established method for assessing abdominal fat distribution in adults, has not yet been evaluated in infants. To adapt the sonographic measurement of abdominal fat distribution to infants and study its reliability. The Generation R study, a population-based prospective cohort study. We included 212 one- and 227 two-year old Dutch infants in the present analysis. Sixty-two infants underwent replicate measurements to assess reproducibility. We developed a standardized protocol to measure the thickness of (1) subcutaneous and (2) preperitoneal fat in the upper abdomen of infants. To this end we defined infancy specific measurement areas to quantify fat thickness. Reproducibility of fat measurements was good to excellent with intraclass correlation coefficients of 0.93-0.97 for intra-observer agreement and of 0.89-0.95 for inter-observer agreement. We observed a pronounced increase in preperitoneal fat thickness in the second year of life while subcutaneous fat thickness increased only slightly, resulting in an altered body fat distribution. Gender did not significantly influence fat distribution in the first two years of life. Our age specific protocol for the sonographic measurement of central subcutaneous and preperitoneal fat is a reproducible method that can be instrumental for investigating fat distribution in early life.
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