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  • Title: Plasma reproductive hormones in normal and vasectomized Chinese males.
    Author: Peng XS, Li FD, Miao ZR, Ye XM, Wong Y, Hu XZ, Zhong ZZ, Zeng FX, Wu XQ, Lan J.
    Journal: Int J Androl; 1987 Apr; 10(2):471-9. PubMed ID: 3112029.
    Abstract:
    Plasma reproductive hormones (testosterone, LH, FSH and prolactin) were measured in 298 normal healthy males aged 30-73 years from rural areas of Sichuan Province, People's Republic of China, and in 505 similar men vasectomized between 1 year and 25 years previously. Age-related increases in LH and FSH but not in testosterone or prolactin were noted in normal men. No adverse effects of vasectomy were observed apart from a 16% increase in mean LH levels in the vasectomized compared to non-vasectomized men of similar ages. The longterm effect of vasectomy on plasma reproductive hormones was investigated in a cross-sectional study conducted in China's Sichuan Province. The study group included 505 men 30-73 years of age who had undergone vasectomy 1-25 years earlier and 298 nonvasectomized controls in the same age group. The mean age of vasectomized men was 48.8 years and that if controls was 46.3 years. The mean duration since vasectomy was 12.4 years in the study group. Study findings revealed a significant increase in plasma testosterone and follicle-stimulating hormone (FSH) with time since vasectomy, but no difference was observed between the vasectomized men and nonvasectomized controls when age effects were controlled. The mean testosterone level in men vasectomized 1-11 years earlier (22.8 nmol/1) was significantly below that for nonvasectomized controls (24.9 mmol/1); however, in men vasectomized 12-15, 16-19, and 20+ years earlier the mean testosterone levels were higher (26.4, 24.6, and 29.0 mmol/1, respectively). Plasma luteinizing hormone (LH) levels increased with age in both groups, but the levels did not differ according to time since vasectomy. The rise in plasma LH, without an associated decrease in testosterone levels, in healthy men suggests either that the aging testis requires higher concentrations of gonadotropins to maintain its testosterone biosynthetic efficiency or that the biological to immunological ratio of the circulating LH may decrease with age.
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