Abstract
To validate different methods for estimating HIV/Aids patients' body fat: total body skinfold thickness, central (trunk) skinfold thickness, peripheral (limb) skinfold thickness, waist circumference (WC) and waist-to-hip ratio (WHR). Dual-energy X-ray absorptiometry (DEXA) and computed tomography of the abdomen (CTA) were used as the gold standard. An analysis was done on 15 adult HIV/Aids patients (10 men and 5 women) who were being treated at an Aids clinic at a public university hospital, Sao Paulo, Brazil. Their total subcutaneous fat (TSF) was estimated from the sum of the thicknesses of the biceps, triceps, subscapular, midaxillary, suprailiac, abdominal and medial calf skinfolds. The central subcutaneous fat (CSF) was estimated by summing the subscapular, axillary, suprailiac and abdominal skinfold measurements. The peripheral subcutaneous fat (PSF) was estimated by summing the biceps, triceps and medial calf skinfold measurements. These were compared with Dexa. The WC, WHR and CSF were compared with CTA. In the statistical analysis, the Pearson correlation coefficient (r) and Mann-Whitney test were utilized. There was a correlation between fat mass measured by DEXA and by TSF, CSF and PSF, even after adjusting for age (r> or =0.80 for all). WC, WHR and CSF presented correlation with total abdominal fat measured by CTA, even after adjusting for age (r> or =0.80 for all). The methods for estimating body fat should be chosen according to the type of fat to be evaluated and can be used in research and healthcare services instead of DEXA and CTA for HIV/AIDS patients.
Highlights
Imaging methods such as whole-body dualenergy X-ray absorptiometry (Dexa) and computed tomography of the abdomen (CTA) are considered to be good techniques for measuring body fat mass[15] and, as such, they have been used in studies on human immunodeficiency virus (HIV)/ AIDS patients.[2,3,14,16]
The more accessible of these methods, such as the total body skinfold thickness, waist circumference and waist-to-hip ratio have already been used in research on HIV/ AIDS patients carried out in developed countries,[11,14,17] but studies on this topic are scarce in Brazil
Examinations performed using Dexa and CTA were taken to be the gold standard for comparisons with anthropometry
Summary
Estimativa da gordura corporal em portadores HIV Florindo AA et al subject difficult and often impossible. Faced with this situation, the alternative is to utilize doubly indirect methods to estimate fat mass, such as summed skinfold thickness and circumferences,[7] despite the possible variability between evaluations.[13] The more accessible of these methods, such as the total body skinfold thickness, waist circumference and waist-to-hip ratio have already been used in research on HIV/ AIDS patients carried out in developed countries,[11,14,17] but studies on this topic are scarce in Brazil
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