Different measurements of the sagittal abdominal diameter and waist perimeter in the prediction of HOMA-IR.
BACKGROUND
The correlation between the increase in visceral fat and insulin resistance makes the sagittal abdominal diameter and the waist perimeter as potential tools for the prediction of insulin resistance.


OBJECTIVE
To assess the reproducibility of different measurements of the sagittal abdominal diameter and the waist perimeter and analyze the discriminating power of the measurements when predicting insulin resistance.


METHODS
A total of 190 adult males were studied. The sagittal abdominal diameter (smallest girth, larger abdominal diameter, umbilical level and midpoint between the iliac crests) and the waist perimeter (umbilical level, smallest girth, immediately above the iliac crest and midpoint between the iliac crest and the last rib) were measured at four different sites. Insulin resistance was assessed by the homeostasis model of assessment-insulin resistance (HOMA-IR) index.


RESULTS
All measurements presented an intraclass correlation of 0.986-0.999. The sagittal abdominal diameter measured at the smallest girth (r=0.482 and AUC=0.739+/-0.049) and the waist perimeter measured at the midpoint between the last rib and the iliac crest (r=0.464 and AUC=0.746+/-0.05) presented the highest correlations with the HOMA-IR and the best discriminating power for HOMA-IR according to the ROC analysis (p<0.001).


CONCLUSIONS
The sagittal abdominal diameter and waist perimeter showed to be highly reproducible and the sagittal abdominal diameter (smallest girth) and waist perimeter (midpoint between the iliac crest and the last rib) presented the best performance when predicting HOMA-IR. Further studies in other groups of the Brazilian population must be carried out to allow the use of these indicators of insulin resistance in the population as a whole, following standardized procedures.
Universidade Federal de Viçosa, Viçosa, MG, Brasil. anacarolinavasques@yahoo.com.br
Ana Carolina Junqueira
AC
Vasques
Lina Enriqueta Frandsen Paez de Lima
LE
Rosado
Gilberto Paixão
GP
Rosado
Rita de Cassia Lanes
Rde C
Ribeiro
Sylvia do Carmo Castro
Sdo C
Franceschini
Bruno
B
Geloneze
Silvia Eloiza
SE
Priore
Dirce Ribeiro de
DR
Oliveira
D050153:Abdominal Fat / Q000033:anatomy & histology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000886:Anthropometry / Q000379:methods; D004812:Epidemiologic Methods; D006801:Humans; D007333:Insulin Resistance / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D055105:Waist Circumference / Q000502:physiology*; D055815:Young Adult