[Increased body mass index increase and insulin resistance parameters in dyslipidemia. Risk and positive correlation in essential obesity]. / Aumento del BMI e parametri di insulino-resistenza e di dislipidemia. Riscontro di correlazioni positive nell'obesità essenziale.

BACKGROUND: Obesity is frequently characterized by hyperinsulinemia with insulin-resistance, tendency to impaired glucose tolerance and by impaired lipidic picture. The relationship existing between some obesity parameters i.e. BMI and weight excess (EP) regarding ideal weight calculated according Lorenz's formula and main parameters both of insulin-resistance and lipidic picture can be interesting. METHODS: 58 obese subject (10 M e 48 F) age 38 +/- 6.2 years (mean +/- DS) with BMI 34.3 +/- 5.3 and EP 33.7 +/- 15; they didn't suffer from hypertension and diabetes; they was subjected to an OGTT and evaluation of glycemia and insulinemia after 0', 60', 90', 120', 150', 180'. Moreover an assessment of lipidic state (cholesterol, triglyceride, HDL, LDL) was carried out. Glycemia and insulinemia with respective areas under curve (AUC glyc. e AUC ins.) and increases (AUCI glyc. e AUCI ins.) were compared with BMI and EP for searching relationship. The same was done for lipidic state. RESULTS: BMI was found positively related with glycemia after 0' (r = 0.3043, p < 0.05) 60' (r = 0.3465, p < 0.05) 120' (r = 0.2895, p < 0.05) with AUC glyc. (r = 0411, p < 0.01) and AUCI glyc. (r = 0.276, p < 0.05), with insulinemia after 0' (r = 0.365, p < 0.01) 60' (r = 0.350, p < 0.01) and with AUC ins. (r = 0.272, p < 0.05). HDL is negatively (r = -0.307, p < 0.05) instead of triglyceride positive related (r = 0.338, p < 0.05) with BMI. EP is positively related with glycemia after 0' (r = 0.376, p < 0.01), 60' (r = 0.362, p < 0.01), 120' (r = 0.290, p < 0.05), with AUC glyc. (r = 0.422, p < 0.01), with insulinemia after 0' (r = 0.512, p < 0.01), 60' (r = 0.473, p < 0.01) with AUC ins. (r = 0.420, p < 0.01) and AUCI ins. (r = 0.354, p < 0.01). Triglyceride was positively related (r = 0.365 p < 0.01) with EP. CONCLUSIONS: These relationships suggest that BMI and EP can be considered as indicators not only of obesity degree, but also of hyperinsulinemia and, to a lesser extent, dyslipidemia severity.