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/m2. HOMA-IR, fasting insulin, glucose120, and insulin120 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 %. AUCglucose, glucose60, glucose120, and insulin120 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.
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Acknowledgments
The authors acknowledge the contributions of Rena Ishii, Rena Ikeda, Kumiko Kuroda, and Hisae Yokota for sample processing.
Conflict of interest
H. Negishi, K. Nakao, M. Kimura, H. Takenaka, and M. Horikawa declare that they have no conflicts of interest.
Human rights statements and informed consent
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and its later amendments. Informed consent was obtained from all patients for being included in the study.
Animal rights
This article does not contain any studies with animal subjects performed by any of the authors.
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Negishi, H., Nakao, K., Kimura, M. et al. Insulin resistance in nonobese Japanese women with polycystic ovary syndrome is associated with poorer glucose tolerance, delayed insulin secretion, and enhanced insulin response. Reprod Med Biol 14, 123–129 (2015). https://doi.org/10.1007/s12522-015-0204-x
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DOI: https://doi.org/10.1007/s12522-015-0204-x