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Abstract
The plasma levels of β-endorphin were studied in 64 women with polycystic ovarian disease (PCOD) ,from whom was selected a group of 23 women with normal weight and amenorrhea of <36 days. On day 21 ,β-endorphin levels were: mean 64.92 pg/ml; SD 37.32 pg/ml; 95% CI 48.38-81.47 pg/ml. It was also observed that their levels of opioid peptide were reduced ,compared with women who had normal ovulatory cycles ,both in the follicular phase (mean 70.93 pg/ml; SD 24.59 pg/ml; 95% CI 76.84-99.77 pg/ml) and luteal phase (mean 88.30 pg/ml; SD 31.80 pg/ml; 95% CI 76.84-99.77 pg/ml). The results were statistically significant (p < 0.05) for levels in PCOD patients compared with those of the luteal phase in women with normal ovulatory cycles. The decreased levels of β-endorphin were negatively related to luteinizing hormone (LH) levels ,which might explain the rise of LH levels in women with PCOD who control their weight and at the time of amenorrhea ,although it is not clear if central opioid activity is reflected in the peripheral blood.