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Patients with polycystic ovary syndrome (PCOS) have a higher apnea-hypopnea index (AHI) than did controls. The relationship between heart rate variability (HRV) changes and apneic-hypopneic events in non-obese women with PCOS during sleep is yet to be determined.

All participants (14 untreated women with PCOS and 11 age-and BMI-controlled healthy women, with mean body mass indexes of 21.51±0.63 and 21.27±0.66 Kg/cm^2, respectively) underwent whole-night standard polysomnographic (PSG) monitoring and assessment of serum hormone and homeostasis model assessment of insulin resistance (HOMA-IR). Short-term HRV (in different sleep stages) and long-term HRV (6-hour sleep) were obtained by a power spectral analys is.

The AHI and arousal index during the non-rapid eye movement stage (AHI_NREM and ARI_NREM were both higher in non-obese women …