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Early pubertal luteinizing hormone (LH), and by inference gonadotropin-releasing hormone (GnRH), pulse secretion is marked by high nocturnal but low daytime frequency; however, the underlying mechanisms remain unclear. Plasma concentrations of progesterone, the major regulator of GnRH frequency in women, increase in the early morning in early pubertal girls and may help slow daytime GnRH frequency.

Differential Sleep-Wake Sensitivity of Gonadotropin-Releasing Hormone Secretion to Progesterone Inhibition in Early Pubertal Girls