A new research reveal that : human sperm
are generally at their healthiest in winter and early spring.
Based on samples from more than 6,000 men
treated for infertility, researchers writing in American Journal of Obstetrics
& Gynecology found sperm in greater numbers, with faster swimming speeds
and fewer abnormalities in semen made during the winter, with a steady decline
in quality from spring onward.
The scientists said :” If there is a
seasonal pattern, that knowledge may ‘be of paramount importance, especially in
couples with male-related infertility struggling with unsuccessful and
prolonged fertility treatments’””.
The World Health Organization defines anything
over 16 million sperm per milliliter of semen as a normal sperm count.According
to this criterion, Eliahu Levitas found that men produced about 70 million
sperm per milliliter of semen during the winter. About 5 percent of those sperm
had "fast" motility, or swimming speed, which improves a couple's
chance of getting pregnant. That compared to the approximately 68 million sperm
per milliliter the men produced in the spring, of which only about 3 percent
were "fast."
In animal studies, seasonal changes in
sperm production and fertility have been demonstrated,it is rare to link to human.
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