السبت، 15 ديسمبر 2012

Global warnings of declining fertility in men

Due to environmental pollution and the presence of certain female hormones and chlorine at a high rate in the blood.
Global warnings of declining fertility in men
 
 
 
 Environmental pollution one of the causes of infertility

    
The man responsible for childlessness rate estimated by medicine by 40%, which is equal to the percentage of women. And heredity influence in a man's fertility and sperm count has, but scientists believe that environmental factors also have an effect. It is noticeable in recent years that a large proportion of men around the world are exposed to a steady decline in the number of sperm.
And proved several studies done at longer intervals and in different parts of the world that the rate of fertilization when the men in diminishing and this research study conducted by researchers from Aberdeen in Scotland and led by Dr. Bata Shariya 16 thousand sample of semen taken than 7500 men showed a decline of sperm count 29% of 87 million sperm per milliliter in 1989 to 62 million in 2002. This Maahart him earlier study published in the British Medical Journal by Dr. Carlsen and his colleagues in the year 1992 after reviewing the results of 15.000 men, which showed a decline in الانطاف by about 50% (from 113 million per milliliter per in 1938 to 66 million per milliliter in 1990) ie within fifty years ago.
This and other studies have led to major medical controversy among specialists and interested in masculinity disease and reproductive medicine between supporters and opponents of the significant results. It is the criticism directed to those studies did not adhere to scientifically based vital statistics, has prompted the criticism of many scientists to do more research on this subject at the foundations of survey and scientifically recognized medically to prove or disprove the statement in the preliminary studies that inspired down the number of animals and the degree of sperm fertilization globally in men.
In a Danish study on 201 men did not show any difference in relation to the number of animals between several regions but there was a decrease in the speed of movement in the east coast of Denmark as a result of organic chlorine contamination in that area. Has highlighted research conducted on different quality semen in several European cities, including Copenhagen in Denmark and Paris in France and Edinburgh in Scotland and Turk in Finland that the lowest percentage of the number of sperm appeared in men Danes followed by French and Scots in the rate of sperm moving higher proportion of Scots followed Finns and Danes, the French, did not show any difference between all these men in relation to the form of sperm, have disagreed sperm count by seasons with recording the highest rate in winter and lowest in summer, and instructed Dr. جورغنسن (principal investigator) and his colleagues difference these percentages to various environmental factors and lifestyle of these men in those countries. As for the United States was published by Dr. John and his colleagues in 2003 a study on the different quality of semen by geographic locations in the United States when men Almnajabin found that the lowest number of the movement of sperm appeared in the city of Columbia in Missouri compared to New York, Minnesota and California without any teams, including in relation to the volume of semen or sperm shape natural suggesting low quality of semen and sperm count in rural and agricultural areas compared to cities.
In a test conducted by Dr. Irvine and his colleagues on the 577 men in Acetktlanda توبعوا for 11 years show that the number of sperm for men has dropped from 98 million when those born before the year 1959, to 78 million for those born after 1970, which confirms the low number of sperm in that period of Time also confirmed Chinese study lasted from year 1981 to 1996, the 9292 men showed falling rate sperm count of about 103 million in 1983 to about 83 million in the year 1996 with the low percentage movement of about 75% in 1982 to around 67% in Year 1996 and a shortage of sperm with normal shape of about 85% to about 77% between 1983 and 1996. The Dr. Kaya Mo and colleagues in Japan to pursue hundreds of young Japanese for 20 years in the area «Sapporo» in a period of time stretching from 1975 to 1980 and during 1998 did not find a shortage of sperm during that period, creating doubts about the credibility of the Universal Theory about low number of sperm and fertility. In Search Hispanic 22.759 fertile and infertile men توبعوا for a period of 36 years from 1960 to 1996 did not show any decline in sperm count and the percentage of infertility have during that time period.
Recent studies in this area supervised by the French National Institute of Public Health, and published their findings recently in the Journal of Human Reproductive Medicine issued by Britain. And led the results of this scientific study massive and unprecedented to more concern for the reproductive health of men has found that there is a significant decrease and significant progress in reproductive health for men in the world, and in this study, which has between 1989 and 2005, found that the average sperm count in males has dropped by a third to about 26 thousand men, including increasing the risk of infertility, also decreased the amount of healthy sperm (Giralemczuhh) by a similar amount.
The decline coincided sperm count in men worldwide increase in the proportion of testicular cancer, which has doubled over the last thirty years, and a number of other male sexual disorders such as undescended testes, which indicate a disturbing pattern, scientists say.
Despite that there is global studies supports the theory fewer and movement and natural shape of the sperm and the low fertility rate in men over the years and they attribute to environmental pollution and the presence of some female hormones and chlorine at a high rate in the blood of some of the men who complain of the small number of sperm and slowing its movement, but some Research from some other countries disproved that theory especially as it did not show any decrease in the number of sperm movement or any decline in the fertility rate and pregnancy in the past years.
Finally hard truth today that there is a man out of every 5 men (between the ages of 18 and 25) in Europe suffers from weakness in the semen also rates the male sex hormone (testosterone), a hormone necessary to process الانطاف continues to drop, as the rate of testicular cancer and birth defects in reproductive system continues to grow when Western man as indicated by the competent research.
 
 
 
 

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