NCT00431197

Steady-State Feedback Actions of Testosterone on Luteinizing Hormone Secretion in Young and Older Men

• Status: Completed
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 40 (estimated)
• Sponsor: Mayo Clinic · Academic / Other
• Sex: Male
• Age: 18 Years – 80 Years
• Healthy volunteers: Accepted

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.

Conditions

• Hypogonadism

Interventions

Type	Name	Description
DRUG	Ketoconazole, Dexamethesone, Androgel,GnRH

Timeline

• Start date: 2004-02-01
• Primary completion: 2007-12-01
• Completion: 2007-12-01
• First posted: 2007-02-05
• Last updated: 2010-01-28

Locations

1 site across 1 country: United States