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Gonadotropins, estrogens, and adrenal steroids during the menopausal hot flash.

Six postmenopausal women with frequent hot flashes underwent an 8-h recording of finger temperature as an objective marker of flushing. Serial measurements of serum LH, FSH, estrone, estradiol, dehydroepiandrosterone (DHEA), androstenedione (Δ), cortisol (F), and progesterone were also performed to identify any acute fluctuations in hormonal concentrations which were associated with the temperature changes. A significant increase (P < 0.001) in the level of LH was found, with a maximal percent change of 34 ± 4% during the 5- to 10- min segment after the onset of the finger temperature rises. This maximal LH increase coincided with a maximal finger temperature increase 7.2 ± 0.7 min after onset. Significant correlations were noted between LH measurements and finger temperature measured simultaneously and 5 and 10 min before the time of the sample, suggesting that the maximal LH increase occurs slightly after the maximal finger temperature elevation. Significant rises of DHEA (P < 0.02), A (P < 0.02), and F...