The aging Leydig cell V. Diurnal rhythms in aged men.
Basal circulating levels of progesterone, 17 alpha-OH-progesterone, dehydroepiandrosterone, androstenedione, testosterone and oestradiol-17 beta were measured in 'young' (median age 34 years) and 'old' (median age 73 years) normal males between 08.30 and 17.00 h. Diurnal rhythms for 17 alpha-OH-progesterone, dehydroepiandrosterone, androstenedione and testosterone were observed in both young and old men. No rhythms were discernible for progesterone or oestradiol-17 beta in both age groups.
D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging; D000735:Androstenedione / Q000097:blood; D002845:Chromatography; D002940:Circadian Rhythm; D003687:Dehydroepiandrosterone / Q000097:blood; D004958:Estradiol / Q000097:blood*; D006801:Humans; D006908:Hydroxyprogesterones / Q000097:blood; D007985:Leydig Cells / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D011374:Progesterone / Q000097:blood; D011863:Radioimmunoassay; D013739:Testosterone / Q000097:blood*
D006908:Hydroxyprogesterones; D013739:Testosterone; D000735:Androstenedione; D003687:Dehydroepiandrosterone; D011374:Progesterone; D004958:Estradiol