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  1. Disturbing the light-darkness pattern reduces circulating testosterone in healthy men.

    Article - En anglais

    This is an analytic-sagital-observational-endocrinological study of the environmental stress induced by disturbing the light-darkness pattem.

    A population of 15 males, ages 28-59 years old, participated at random.

    All had had a pattern sleep of 22 : 00-6 : 00 h. A blood peripheral sample was obtained in each between 8 : 00 and 9 : 30 h several days before 6 April 1997 (summer daylight change) (phase I).

    A second blood sample was obtained in the following 72 h right after 6 April 1997.

    No significant changes in estradiol levels were observed ; however, on an individual basis 12/15 males showed a testosterone reduction ranging from 5.0 to 48.6% ; and, on a group basis testosterone reduction was 4.5 ± 1.3 vs. 3.5 ± 1.0 (ng/mL) SD, p=05, comparing phase I vs. phase II.

    This finding shows the need to balance economical gain vs. changes in the health status of the population exposed to light-dark stress and may help slow the human biology deteriorating process.

    Mots-clés Pascal : Stress, Photopériode, Rythme circadien, Testostérone, Estradiol, Exploration hormonale, Rythme biologique, Androgène, Hormone testiculaire, Hormone stéroïde sexuelle, Oestrogène, Hormone ovarienne, Homme, Mâle

    Mots-clés Pascal anglais : Stress, Photoperiod, Circadian rhythm, Testosterone, Estradiol, Hormonal investigation, Biological rhythm, Androgen, Testicular hormone, Sex steroid hormone, Estrogen, Ovarian hormone, Human, Male

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 98-0174576

    Code Inist : 002A29D02. Création : 11/09/1998.