Open AccessInsulin resistance in nonobese Japanese women with polycystic ovary syndrome is associated with poorer glucose tolerance, delayed insulin secretion, and enhanced insulin response
Author(s) -
Negishi Hiroaki,
Nakao Kazuki,
Kimura Michiko,
Takenaka Hiroshi,
Horikawa Michiharu
Publication year - 2015
Publication title -
reproductive medicine and biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 22
eISSN - 1447-0578
pISSN - 1445-5781
DOI - 10.1007/s12522-015-0204-x
Subject(s) - medicine , endocrinology , insulin resistance , insulin , polycystic ovary , impaired glucose tolerance
Abstract Purpose To determine the prevalence of insulin resistance (IR) and impaired glucose tolerance (IGT) in PCOS patients, the optimal screening method, and to compare our findings between nonobese and obese Japanese women with PCOS. Methods Ninety‐eight PCOS patients were included in this research from 2006 to 2013. Glucose tolerance test (OGTT) was performed. Serum glucose and insulin concentration were assayed before and 30, 60, and 120 min after taking 75 g of glucose. Results All examined metabolic parameters were significantly favorable in the nonobese subjects, below 25 kg/m 2 . HOMA‐IR, fasting insulin, glucose 120 , and insulin 120 showed strong correlations with BMI. A total of 1.4 % of nonobese women had IR based on fasting insulin or HOMA‐IR. However, 15.5 % (11/71) of nonobese women had IR as determined by a continuous increase of serum insulin level in OGTT. In comparison, the prevalence of IR among the obese women ranged from 41 to 59 %. AUC glucose , glucose 60 , glucose 120 , and insulin 120 in nonobese women with a continuous insulin increase were higher than those without such a continuous increase. Conclusions All examined metabolic parameters were significantly correlated with BMI. As the presence of a continuous increase of insulin level reflects to some degree poorer glucose tolerance, delayed insulin secretion, and enhanced insulin response compared with non‐continuous insulin increase, OGTT might not been excluded to determine IR and IGT for nonobese women with PCOS.