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  1. Semen analyses in 1,283 men from the United States over a 25-year period : no decline in quality.

    Article - En anglais


    To determine whether semen quality has changed in the United States over the last 25 years.


    Retrospective review.


    Three U.S. sperm banks, Cryogenic Laboratories, Inc. (Roseville, Minnesota), Idant Laboratories (New York, New York), and California Cryobank, Inc. (Los Angeles, California).


    Twelve hundred eighty-three consecutive men who banked sperm before vasectomy from 1970 to 1994.



    Main Outcome Measures 

    Age at sample collection, sperm concentration, volume, motility, and days of abstinence before sample collection were determined for each man.

    Linear and multiple regression analyses were used to assess changes in these characteristics over time.


    Controlling for the effects of age and duration of abstinence, there was a slight but significant increase in mean sperm concentration but no change in either motility or semen volume over the 25-year period.

    Both sperm motility and semen volume decreased with increasing age at sample collection.

    Both sperm concentration and semen volume increased as a function of duration of abstinence.

    There were significant differences in mean (±SEM) sperm concentrations (106 sperm/mL) and motilities between the different sperm banks with California lowest (72.7 ± 3.1,51.4% ± 1.1%, respectively), Minnesota higher (100.8 ± 2.9,56.0% ± 0.5%, respectively), and New York highest (131.5 ± 3.5,58.2% ± 0.5%, respectively).


    Our data show no decline...

    Mots-clés Pascal : Mâle, Sperme, Spermatozoïde, Qualité, Spermogramme, Variation géographique, Variation temporelle, Epidémiologie, Fécondité, Cellule germinale, Etats Unis, Amérique du Nord, Amérique, Homme

    Mots-clés Pascal anglais : Male, Semen, Spermatozoa, Quality, Sperm count, Geographical variation, Time variation, Epidemiology, Fecundity, Germinal cell, United States, North America, America, Human

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

    Cote : 96-0270941

    Code Inist : 002B30A01A2. Création : 199608.