We will begin enrolling subjects within three months of receipt of funding, and study 60 subjects (30 in each group) within 24 months. All subjects will undergo follow-up evaluation 6 and 12 months after completion of inpatient rehabilitation and cessation of testosterone supplementation. Therefore, this project will be completed within 3 years. Our short term goal (within 3 years) is to delineate the safety and efficacy of testosterone supplementation on rehabilitation outcomes in deconditioned older men. Our long range goal is to determine whether other hormones (e.g., combined testosterone and growth hormone) are helpful as an adjunct to traditional rehabilitation therapy in the care of older men