Neuroendocrine Correlates of Aging in the Male
Prominent age-associated changes occur in the male reproductive system. With aging, normal men experience a gradual decrease in both sexual activity (Figure 1) and in the interest in sexual performance (Kinsey et al., 1948). Despite the fact that occasional cases of fertility persisting in men in their nineties have been reported, fertility rates decline in men during the normal aging process (Harman, 1978). Similarly, in other mammals such as rats and nonhuman primates, various measures of male sexual activity and fertility decline with aging. Rates of contact with females, mounting, and ejaculation all decrease in normal old animals (Larsson and Essberg, 1962; Phoenix and Chambers, 1982).
KeywordsLuteinizing Hormone Circadian Rhythm Testosterone Level Leydig Cell Serum Testosterone Level
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