Hypogonadism
Conditions
Brief summary
This study is being done to learn how the male hormone , testosterone, affects pituitary hormones in younger and older men. The pituitary is a gland in the brain that secretes hormones, some of which normally control growth and fertility.
Detailed description
Concentrations of bioavailable testosterone decline by 1.0-1.5% annually as men age. Reduced systemic testosterone availability is associated with decreased muscle mass, strength and aerobic capacity, decreased bone-mineral density and increased risk of hip fracture, waning sexual interest, inpaired spatial cognition and increased risk of visceral obesity, impaired glucose tolerance and coronary artery disease. Luteinizing hormone (LH) secretion often fails in healthy older individuals. In addition, aging is marked by an acceleration of LH pulse frequency, loss of high-amplitude LH pulses and disorderly release of LH and testosterone, as measured by the approximate entropy statistic. The mechanisms that underlie such complex adaptations are not known, but appear to involve multiple loci of regulatory failure.
Interventions
DRUGKetoconazole, Dexamethesone, Androgel,GnRH
Sponsors
National Institutes of Health (NIH)
Mayo Clinic
Study design
Allocation
RANDOMIZED
Intervention model
SINGLE_GROUP
Masking
DOUBLE
Eligibility
Sex/Gender
MALE
Age
18 Years to 80 Years
Healthy volunteers
Yes
Inclusion criteria
* Healthy Men Ages 18-80 * All ethnicities eligible * Men with indeterminate erectile dysfunction eligible with normal serum gonadotropin, total testosterone, prolactin and TSH concentrations and documented integrity of the neurovascular, cardiovascular, hepatorenal systems
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| LH and Testosterone levels will be evaluated after 4 study visits | — |
Countries
United States
Outcome results
None listed