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  • Title: Psychological stress and testicular function: a cross-sectional study of 1,215 Danish men.
    Author: Nordkap L, Jensen TK, Hansen ÅM, Lassen TH, Bang AK, Joensen UN, Blomberg Jensen M, Skakkebæk NE, Jørgensen N.
    Journal: Fertil Steril; 2016 Jan; 105(1):174-87.e1-2. PubMed ID: 26477499.
    Abstract:
    OBJECTIVE: To study the associations between self-reported psychological stress, semen quality, and serum reproductive hormones among young Danish men. DESIGN: Cross-sectional study. SETTING: University hospital-based research center. PARTICIPANT(S): Danish men (median age 19 years) from the general population were investigated from 2008 to 2012. INTERVENTION(S): Participants completed a questionnaire on health and lifestyle, including a four-item questionnaire about self-rated stress, had a physical examination performed, delivered a semen sample, and had a blood sample drawn. MAIN OUTCOME MEASURE(S): Semen parameters (semen volume, sperm concentration, and percentages of motile and morphologically normal spermatozoa) and serum levels of reproductive hormones (LH, FSH, T, calculated free T, sex hormone-binding globulin, and inhibin B). RESULT(S): Poorer semen quality was detected among men with self-reported stress scores above an intermediate stress level, in a dose-response manner. For example, men with the highest stress levels had 38% (95% confidence interval [CI] 3%; 61%) lower sperm concentration, 34% (95% CI 59%; 106%) lower total sperm count, and 15% (95% CI 1%; 27%) lower semen volume than men with intermediate stress levels. No significant associations between self-reported stress and levels of reproductive hormones were detected. CONCLUSION(S): A negative association between self-reported stress and semen quality was detected. If causal, stress may be a contributing factor for suboptimal semen quality among otherwise healthy men.
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