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Sperm counts are highest and the little swimmers move faster in the Winter and early Spring say a team of Israeli researchers.
According to the March 10, Daily Mail, Professor Eliahu Levitas and his colleagues, from Ben-Gurion University of the Negev ”found sperm in greater numbers, with faster swimming speeds, and fewer abnormalities, in semen made during the winter, “ and that the “sperm declined steadily in quality from spring onwards.”
The study published in the “American Journal of Obstetrics & Gynaecology” was based on 6,455 semen samples from men collected and analyzed at the University’s fertility clinic between January 2006 and July 2009.
The research team found that 4,960 had normal sperm production.
Additionally the scientists found that normal producing men produced about 70 million sperm per millilitre of semen during the winter with approximately five percent faster than normal swimmers. Springtime the numbers fall to 68 million sperm per millilitre of semen with the number of fast swimmers declining to only three percent.
The World Health Organization says that any count over 16 million sperm per millilitre of semen is considered normal.
According to the article, previous research has found that human sperm counts around the world are declining although it is not known why. Theories for declining counts range from sedentary lifestyles to chemicals in the environment.
Research published in February showed that young men who watch television for just three hours a day have "half the sperm count of men rarely found in front of the box." According to experts this could be due to lack of physical activity or to overheating of the testicles from prolonged sitting.
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