Evaluation of metabolic syndrome risk in Korean premenopausal women - Not waist circumference but visceral fat

Background In clinical practice, using the patient's waist circumference (WC) to evaluate visceral obesity may underestimate disorders with a metabolic origin. This study examined whether or not the WC derived from the cut-off point of the visceral fat area (VFA) can reflect the features of metabolic syndrome (MetS) in premenopausal women. Methods and Results Computed tomography-scanned VFA, MetS components and the concentrations of high-sensitivity C-reactive protein (CRP) and adiponectin were measured in a total of 349 premenopausal women. The VFA at the L1 and the L4 sites was a significant index (p<0.001) of incremental MetS risk. Receiver-operating characteristic curve analysis showed that 75 cm(2) of VFA at L4 and 87.5cm(2) at L1 were the optimal thresholds for discrimination of MetS risk. Significant differences in all MetS components, as well as CRP (p<0.05) and adiponectin levels (p<0.005), were observed when subjects were subdivided by the L4 VFA cut-off point (<75/ >= 75cm(2)), whereas there was a significant difference only in the triglycerides level in the groups divided by WC (WC <88/>= 88cm). Moreover, subjects with a lower WC-higher VFA showed a similar pattern in MetS components and lower adiponectin than those with a higher WC-higher VFA. Conclusions This study clarified that VFA rather than WC is a major determinant of MetS risk in premenopausal women.