Measurements of testosterone concentrations in peripheral and spermatic venous blood
have yielded conflicting results concerning testosterone production in elderly men. To further …

Testosterone and the testosterone precursors pregnenolone, progesterone, 17α-
hydroxyprogesterone, 17α-hydroxypregnenolone, androstenedione, androstenediol and …

Abstract Androstenedione (Δ), Testosterone (T) and Dihydrotestosterone (DHT) have been
measured by radioimmunoassay in spermatic venous plasma from 38 men aged from 17 to …

To determine the basis for the decline in testosterone production by the aged testis,
intratesticular unconjugated steroids, including testosterone, pregnenolone (3β-hydroxy-5 …

Publisher Summary This chapter discusses gonadotropins and plasma testosterone in
senescence. An investigation described in the chapter showed that the testis was capable of …

Testicular endocrine function and androgen-dependent secondary sexual characteristics
were assessed in 283 men 18 to 96 years of age. Mean serum total testosterone levels …

SUMMARY Δ 4 and Δ 5 androgens were measured in spermatic venous blood of 25
subjects (age range 20–70) during surgical intervention for hernia repair. All androgens …

A decrease in sexual activity with increasing age has been generally accepted as an
established fact by the lay public, and ever since Brown Sequard's and Voronoff's …

Abstract Plasma cortisol, 17-hydroxyprogesterone (17-OH-P), testosterone (T), 5α-
dihydrotestosterone (DHT, estrone (E 1) and estradiol (E 2), were measured in 94 normal …

IN CONTRAST to the situation in women, where the menopause marks the end of the fertile
period, in men fertility persists into old age. Nevertheless old age in men is accompanied by …