title: [Circadian and circannual study of the hypophyseal-gonadal axis in healthy young males].
abstract: Circadian and circannual variations of Testosterone, FSH and LH secretions, other than Oral Body Temperature (OBT) have been studied in four healthy males. OBT showed a constant circadian rhythm with an acrophase located in the afternoon. Plasma Testosterone exhibited both a circadian (acrophase = hr 09,28) and a circannual rhythm (acrophase = 22 february); plasma FSH also showed a circannual rhythm (acrophase = 13 february). By mean chronogram +/- SEM we documented the highest LH levels in December and the lowest in February. These observations would suggest the hypothesis that the winter could be the period in which the hypophysis-gonadal axis in young males exhibits its maximal activity as previously documented for other hormones.
mesh_terms: D000328:Adult; D001831:Body Temperature; D002940:Circadian Rhythm; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010902:Pituitary Gland / Q000502:physiology*; D012016:Reference Values; D012621:Seasons; D013737:Testis / Q000502:physiology*; D013739:Testosterone / Q000097:blood
chemical_list: D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone
vernacular_title: Studio circadiano e circannuale dell'asse ipofisi-gonadico in giovani maschi sani.