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Journal of Clinical Endocrinology & Metabolism, Vol 55, 374-377, Copyright © 1982 by Endocrine Society

ARTICLES

Seasonal influence of diurnal rhythms in the onset of the plasma luteinizing hormone surge in women

J Testart, R Frydman and M Roger

The time of the LH surge onset in plasma was detected in 75 human cycles. The preovulatory LH surge began between midnight and 0730 h in two thirds of the patients. According to the season of study, the LH surge began between 1030 and 2215 h in 52.4% of the spring cycles compared with 12.9% of the cycles studied during other seasons (P less than 0.001). The highest frequency of the LH surge occurrence over a 3- h time interval was 1500 +/- 1.5 h during the spring cycles (28.6%) and 0300 +/- 1.5 h (42.5%) during the other seasons. It was estimated that ovulation occurred primarily in the morning during the spring and primarily in the evening during autumn and winter.


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Hum. Reprod., January 1, 1999; 14(1): 106 - 109.
[Abstract] [Full Text] [PDF]


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