Endocrine Abstracts

Men show an age-associated decline in 24-hour circulating testosterone levels, but the reason for this decline is unclear. To shed light on the possible cause we first established that male rhesus monkeys undergo a similar decline in testosterone with age. Testosterone from young adult (∼10 years) and old (∼26 years) unanaesthetized males was measured by RIA from blood samples collected remotely through a vascular catheter, every 30 minutes for 24 hours. In both yo...