TITLE

Decreasing sperm quality: a global problem?

AUTHOR(S)
Merzenich, Hiltrud; Zeeb, Hajo; Blettner, Maria
PUB. DATE
January 2010
SOURCE
BMC Public Health;2010, Vol. 10, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Carlsen and coworkers (1992) reviewed 61 heterogeneous observational studies on semen quality published between 1938 and 1990. This review indicates that mean sperm density decreased significantly between 1940 and 1990. An extended meta-analysis with 101 studies confirmed a decline in sperm density for the period from 1934 to 1996 (2000). The key message of the meta-analyses is that sperm counts have decreased globally by about 50% over the past decades. This assessment has been questioned. Discussion: A major methodological problem of the meta-analysis is the use of data collected in different countries, at different times, on different populations and with different methods of semen analysis. Furthermore, the results of studies concerning semen analysis are frequently biased e.g. by selection criteria of volunteers. In most studies on human semen characteristics the populations under study are insufficiently defined and the study participants are not a representative population sample. The incidence of testicular cancer has increased in Caucasian men worldwide. The investigation of common risk factors for male reproductive disorders requires well designed epidemiological studies and the collection of individual data. Summary: Former meta-analyses of sperm count data show a global downward trend. This conclusion should be interpreted with caution. The included studies are of great heterogeneity due to geographical and/or ethnical variation, different study designs and different methodological standards. Population-based prospective studies are needed to investigate secular trends in male reproductive disorders.
ACCESSION #
48497327

 

Related Articles

  • Quantitative study of caspase-3 activity in semen and after swim-up preparation in relation to sperm quality. Carolina Almeida; Margarida F.Cardoso; Mrio Sousa; Paulo Viana; Ana Gonalves; Joaquina Silva; Alberto Barros // Human Reproduction;May2005, Vol. 20 Issue 5, p1307 

    BACKGROUND: There are no studies relating the apoptotic marker caspase-3 in human sperm to different degrees of abnormal sperm concentration, morphology and rapid progressive motility. METHODS: Semen from 67 males with abnormal semen analyses (n=61) and normozoospermia (n=6) were used. In each...

  • How to improve semen quality?  // New Scientist;6/18/2005, Vol. 186 Issue 2504, p20 

    The article informs that men may be capable of subconsciously increasing the quality of their semen when their sperm might have to compete. Zoologists Leigh Simmons and Sarah Kilgallon of the University of Western Australia in Perth asked 52 heterosexual men aged between 18 and 35 to ejaculate...

  • Matrix metalloproteinase (MMP)-2 and MMP-9 in seminal plasma. Tentes, Ioannis; Asimakopoulos, Byron; Mourvati, Efthimia; Diedrich, Klaus; Safaa Al-Hasani; Nikolettos, Nikos // Journal of Assisted Reproduction & Genetics;Jul2007, Vol. 24 Issue 7, p278 

    Purpose To evaluate the latent and active forms of MMP-2 and MMP-9 in human semen samples and to investigate their association with semen parameters. Methods Basic semen analysis was performed in 82 semen samples. Seminal plasma was analyzed with gelatin zymography. Results Both latent and...

  • Correlation of Sperm Velocity in Seminal Plasma.  // Fertility Weekly;4/24/2006, p4 

    The article discusses research being done on the relationship between sperm velocity in seminal plasma and the gender of offspring. It references a study by M.L.R. Maligaya and colleagues published in the 2006 issue of "Archives of Andrology." The study finds an association between sperm average...

  • The Influence of Freezing on Some Rare Breeds Boar Semen Cryopreservation. Zăhan, Marius; Miclea, Vasile; Ghiuru, Florin; Roman, Iulian; Rusu, Alexandru; Miclea, Ileana; Mihăilescu, Manuel // Bulletin of the University of Agricultural Sciences & Veterinary;2010, Vol. 67 Issue 1/2, p492 

    The article focuses on a study which discusses the application of frozen-thawed (FT) semen in boar semen cryopreservation. The study applied analysis of variance (ANOVA), hypo-osmotic swelling test (HOST) and Eosin-nigrosin viability staining to evaluate semens at room temperature. It found that...

  • Qualitative parameters of the piapara semen (Leporinus elongatus Valenciennes, 1850). Streit-Jr., D. P.; Sirol, R. N.; Ribeiro, R. P.; Moraes, G. V.; Vargas, L. D. M.; Watanabe, A. L. // Brazilian Journal of Biology;May2008, Vol. 68 Issue 2, p373 

    Qualitative parameters of piapara semen (Leporinus elongatus) were evaluated before and after hormonal induction with carp pituitary extract at 2.5 mg.kg-1 of live weight. The progressive motility, the spermatic vigor and the lifetime of the spermatozoa were higher before the hormonal induction...

  • semen analysis. Peters, Michael // BMA A-Z Family Medical Encyclopedia;2004, p680 

    An encyclopedia entry for "semen analysis" is presented. It refers to an examination to determine whether a male is infertile or not. The analysis considers various factors, including sperm concentration, shape and its ability to move. It is also done 12 weeks following vasectomy to make sure...

  • Associated Factors with Male Infertility: A Case Control Study. AHMADI, MOHAMMAD REZA HAFEZI; YASEMI, MASOOD; PEYMAN, HADI; HEMATI, KARIM; KHAJAVIKHAN, JAVAHER; YAGHOUBI, MONIREH; BIMANAND, LIDA // Journal of Clinical & Diagnostic Research;Sep2014, Vol. 8 Issue 9, p11 

    Objective: Sperm analysis is an important step to evaluate and diagnose male's infertility. The present study aimed to determine associated factors with males' infertility by using semen analysis. Materials and Methods: In this study 96 men were evaluated who attended to the infertility clinics...

  • Lead level in seminal plasma may affect semen quality for men without occupational exposure to lead. Hsien-Ming Wu; Dan-Tzu Lin-Tan; Mei-Li Wang; Hong-Yuan Huang; Chyi-Long Lee; Hsin-Shih Wang; Yung-Kuei Soong; Ja-Liang Lin // Reproductive Biology & Endocrinology;2012, Vol. 10 Issue 1, p91 

    Background: Infertility affects approximately 10-15% of reproductive-age couples. Poor semen quality contributes to about 25% of infertile cases. Resulting from the direct effect on testicular function or hormonal alterations, heavy metals exposure has been related to impaired semen quality. The...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics