Be careful about antioxidant use. And you might want to avoid sex, too:
1: Prostate 2001 Jan 1;46(1):33-8
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Effects of long-term alpha-tocopherol supplementation on serum hormones in older men.
Hartman TJ, Dorgan JF, Woodson K, Virtamo J, Tangrea JA, Heinonen OP, Taylor PR, Barrett MJ, Albanes D.
Department of Nutrition, Pennsylvania State University, University Park, Pennsylvania, USA.
BACKGROUND: alpha-tocopherol supplementation significantly reduced risk of prostate cancer in the Alpha-Tocopherol
Beta-Carotene Cancer Prevention (ATBC) Study. Sex hormones are thought to be involved in the etiology of prostate cancer. We
examined whether long-term supplementation with alpha-tocopherol modified serum hormone levels. METHODS: Men who were cancer-free consumed > or = 90% of the study capsules, and who had both baseline and follow-up blood available, were eligible for the study. One hundred men who received alpha-tocopherol were matched on age, study center, and length of time between blood draws to 100 men who received a placebo. Multivariate linear regression models which allowed for a separate intercept for each matched pair were used to evaluate the effect of alpha-tocopherol supplementation on follow-up hormone concentrations. RESULTS: Compared to men who received a placebo, we found significantly lower serum androstenedione (P = 0.04) and testosterone (P = 0.04) concentrations among men who received alpha-tocopherol, after controlling for baseline hormone level, follow-up serum cholesterol concentration, body mass index, smoking, and fasting time. Geometric mean (95% confidence interval; CI)
androstenedione concentration among men who received alpha-tocopherol was 145 ng/dl (CI, 137-153) after adjusting for covariates, compared to 158 ng/dl (CI, 148-167) among men who received a placebo. Mean testosterone concentrations for men who received alpha-tocopherol and placebo were 539 (CI, 517-562) and 573 (CI, 549-598) ng/dl, respectively. CONCLUSIONS: These results suggest that long-term alpha-tocopherol supplementation decreases serum androgen concentrations, and could have been one of the factors contributing to the observed reduction in incidence and mortality of prostate cancer in the alpha-tocopherol treatment group of the ATBC Study. Copyright 2001 Wiley-Liss, Inc
1: World J Urol 2001 Nov;19(5):377-82
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Endocrine response to masturbation-induced orgasm in healthy men following a 3-week sexua abstinence.
Exton MS, Kruger TH, Bursch N, Haake P, Knapp W, Schedlowski M, Hartmann U.
Institut fur Medizinische Psychologie, Universitatsklinikum Essen, Germany.
[email protected]
This current study examined the effect of a 3-week period of sexual abstinence on the neuroendocrine response to
masturbation-induced orgasm. Hormonal and cardiovascular parameters were examined in ten healthy adult men during sexual arousal and masturbation-induced orgasm. Blood was drawn continuously and cardiovascular parameters were constantly monitored. This procedure was conducted for each participant twice, both before and after a 3-week period of sexual abstinence. Plasma was subsequently analysed for concentrations of adrenaline, noradrenaline, cortisol, prolactin, luteinizing hormone and testosterone concentrations. Orgasm increased blood pressure, heart rate, plasma catecholamines and prolactin. These effects were observed both before and after sexual abstinence. In contrast, although plasma testosterone was unaltered by orgasm, higher testosterone concentrations were observed following the period of abstinence. These data demonstrate that acute abstinence does not change the neuroendocrine response to orgasm but does produce elevated levels of testosterone in males
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