As you age, expect to lose muscle fibers and strength unless you exercise. A study from the University of Florida in Gainesville shows that a program of exercise training later in life helps aging rats to reverse this age-related loss of muscle size and strength (American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, November 14, 2007). The study also showed that short-term administration of growth hormone late in life does not prevent loss of muscle strength. Previous studies show that it may help people get rid of fat.
At this time, there is not enough evidence for an older person to take growth hormone to improve muscle strength, and there is no long-term data on safety. Sudden deaths reported in athletes who have taken growth hormone are probably due to the effect of enlarging the heart muscle without also adequately enlarging the blood supply. The larger heart requires more blood and cannot meet its needs for oxygen, so it starts to beat irregularly. More on growth hormone; growth hormone releasers; growth hormone and aging
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