%0 Journal Article
%T Body Fat Mass Assessment: A Comparison between an Ultrasound-Based Device and a Discovery A Model of DXA
%A Jean-Claude Pineau
%A Lo£¿c Lalys
%A Massimo Pellegrini
%A Nino Carlo Battistini
%J ISRN Obesity
%D 2013
%R 10.1155/2013/462394
%X Objective. To examine measurement of body composition by ultrasound compared with a reference technique:dual energy X-ray absorptiometry (DXA). We evaluated the accuracy of a portable ultrasound-based device in estimating total body fat mass with those assessed by DXA in adult. Methods. Body fat mass has been estimated using a portable ultrasound-based device in comparison with a contemporary reference DXA apparatus: the Hologic Discovery A. Anthropometric data has been assessed in order to maximize the output of the software associated with the ultrasound-based device. A cross-validation between ultrasound technique (US) and DXA was developed in this study. Total body fat mass estimated by ultrasound was compared with this DXA model in a sample of 83 women and 41 men. Results. Ultrasound technique (US) of body fat (BF) was better correlated with DXA in both women ( , ) and men ( , ) with standard errors of estimates (SEE) being 2.1£¿kg and 2.2£¿kg, respectively. Conclusion. The use of a portable device based on a US produced a very accurate BF estimate in relation to DXA reference technique. As DXA absorptiometry techniques are not interchangeable, the use of our ultrasound-based device needs to be recalibrated on a more contemporary DXA. 1. Introduction Body composition is one of the most important long-term indicator of nutritional status and it is directly related with the health status. In the two compartments model of body composition, body weight (Body Weight, BW) is considered as the sum of body fat mass (BF) and fat-free or lean mass (Fat Free Mass, FFM). Consequently, change in body weight does not give us information on body composition and often generates diagnoses of obesity without considering the relationship between fat mass and lean body mass [1]. Furthermore, body weight alone does not consider adipose tissue distribution while it is well known that the finding of an excessive increase of fat mass, especially in the abdominal-visceral district, may be associated with an increase in cardiovascular risk. DXA represents a reference method for measuring body fat mass. This instrument allows a fast and accurate measurement of the body composition with an exposure to a minimum dose of X-ray radiation. The high cost, the lack of portability, and the relative invasiveness of the technique are limits to the diffusion of this method. It is known that by ultrasound technique it is also possible to measure subcutaneous fat thickness and to estimate total fat percentage [2, 3]. Until now, the ultrasound technique has often been used for local
%U http://www.hindawi.com/journals/isrn.obesity/2013/462394/