[Seasonal variations of testicular and pituitary function in men].
In 21 young, healthy men typical parameters of pituitary and testicular function were recorded over a period of one year in intervals of two months. The mean sperm count in semen had a minimum in december, a maximum in june. Serum-FSH showed low levels in june, october and december, a peak in august. Levels of FSH following stimulation by LH-RH varied in the same manner, but the response to LH-RH was lower in april. A peak of serum-LH appeared in april, other values being rather constant. The response to LH-RH showed parallel variations. Testosterone levels exhibited a significant peak in june. The mean increase of testosterone following hCG depended on basal levels, but showed a distinct peak in december.
D000328:Adult; D006063:Chorionic Gonadotropin / Q000097:blood; D005640:Follicle Stimulating Hormone / Q000097:blood; D007987:Gonadotropin-Releasing Hormone / Q000097:blood; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010902:Pituitary Gland / Q000502:physiology*; D011388:Prolactin / Q000097:blood; D012621:Seasons; D013737:Testis / Q000502:physiology*; D013739:Testosterone / Q000097:blood; D013997:Time Factors
D006063:Chorionic Gonadotropin; D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone
Jahreszeitliche Veränderungen der Hoden- und Hypophysenfunktion bei Männern.