The relationship between DXA-based and anthropometric measures of visceral fat and morbidity in women

BMC Cardiovascular Disorders

Toby Andrew⁴  Mario Falchi⁴  Tim D Spector¹  Phil Chowienczyk²  William Astle³  Marina Cecelja²  Kenan Direk¹ 

[1] Department of Twin Research and Genetic Epidemiology, London, UK;Department of Clinical Pharmacology, King’s College London, School of Medicine, London, UK;Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Canada;Department of Genomics of Common Disease, School of Public Health, Imperial College London, Hammersmith Hospital, London, UK

关键词: Liver function;    Subclinical atherosclerosis;    Hypertension;    Type 2 diabetes;    DXA;    Adiposity;    Visceral fat;   

Others  :  857754
DOI  :  10.1186/1471-2261-13-25

 received in 2012-08-31, accepted in 2013-03-18,  发布年份 2013

【 摘 要 】

Background

Excess accumulation of visceral fat is a prominent risk factor for cardiovascular and metabolic morbidity. While computed tomography (CT) is the gold standard to measure visceral adiposity, this is often not possible for large studies - thus valid, but less expensive and intrusive proxy measures of visceral fat are required such as dual-energy X-ray absorptiometry (DXA). Study aims were to a) identify a valid DXA-based measure of visceral adipose tissue (VAT), b) estimate VAT heritability and c) assess visceral fat association with morbidity in relation to body fat distribution.

Methods

A validation sample of 54 females measured for detailed body fat composition - assessed using CT, DXA and anthropometry – was used to evaluate previously published predictive models of CT-measured visceral fat. Based upon a validated model, we realised an out-of-sample estimate of abdominal VAT area for a study sample of 3457 female volunteer twins and estimated VAT area heritability using a classical twin study design. Regression and residuals analyses were used to assess the relationship between adiposity and morbidity.

Results

Published models applied to the validation sample explained >80% of the variance in CT-measured visceral fat. While CT visceral fat was best estimated using a linear regression for waist circumference, CT body cavity area and total abdominal fat (R² = 0.91), anthropometric measures alone predicted VAT almost equally well (CT body cavity area and waist circumference, R² = 0.86). Narrow sense VAT area heritability for the study sample was estimated to be 58% (95% CI: 51-66%) with a shared familial component of 24% (17-30%). VAT area is strongly associated with type 2 diabetes (T2D), hypertension (HT), subclinical atherosclerosis and liver function tests. In particular, VAT area is associated with T2D, HT and liver function (alanine transaminase) independent of DXA total abdominal fat and body mass index (BMI).

Conclusions

DXA and anthropometric measures can be utilised to derive estimates of visceral fat as a reliable alternative to CT. Visceral fat is heritable and appears to mediate the association between body adiposity and morbidity. This observation is consistent with hypotheses that suggest excess visceral adiposity is causally related to cardiovascular and metabolic disease.

【 授权许可】

   
2013 Direk et al.; licensee BioMed Central Ltd.

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