The concentration in sperm cells of the sperm fell by 52,4 % between 1973 and 2011 to the western men whereas the total quantity of sperm fell by 59,3 %, according to a meta one analyzes scrutinizing 50 countries.
WHAT IT IS NECESSARY TO HOLD Between 1973 and 2011, the quality of the sperm in the western countries did not stop falling. In almost 40 years, she decreased in 52,4 %. The quantity of sperm fell too: 59,3 %.
For the authors of these searches, chemicals would be the main things responsible for these reductions in the western countries.
An investigation of 2012 on French men showed that the concentration in sperm cells of the sperm had fallen by 32,2 % between 1989 and 2005.
The decline of the sperm and its quality in the world is not new but what alarms the authors of these new works, published in Human reproduction, is that this trend keeps becoming more marked, mainly in the United States, in Australia, in New Zealand and in Europe.
To arrive at this conclusion, research teams international (Israelis, Americans, Brazilians, Danes and Spaniards) based themselves on 7.518 studies, from which they extracted 185 works concerning 42.935 men - whose sperm was taken between 1973 and 2011 - selected according to their age, their period of abstinence, their country of origin, independently of their fertility.
According to the results, the concentration in sperm cells of the sperm fell by 52,4 % between 1973 and 2011 to the western men whereas the total quantity of sperm fell by 59,3 %. The average number of sperm cells observed is 81 millions/ml, any confused country. This figure stays however in the fertile standard of the WHO which considers that is needed a rate upper to 15 millions/ml to design a child.
The fact that we observe this decline in western countries, contrary in Asia, Africa or countries of South America, suggests strongly that chemicals play a role of cause effect. © bluecinema, Istock.com Le does that we observe this decline in western countries, contrary in Asia, Africa or countries of South America, suggest strongly that chemicals play a role of cause effect. What is the causes possible for the decline of the quality of the sperm?
According to the specialists, the phenomenon could be bound to endocrine disruptors, these substances chemical as pesticides, which unsettle the hormonal system. Other hypotheses, products used in plastics and cosmetics or still obesity, settled way of life, stress and smoking which could also have a fatal effect on the fertility.
For the authors of the study, there is urgency to examine the causes of this decline to warn the male infertility and protect the health of the populations, given that a concentration decreased in sperm cells is associated with higher rates of morbidity and mortality