Sperm motility depends on the time of year and changes throughout the year. This conclusion was reached by researchers after analyzing more than 15,000 sperm samples from men in Denmark and the USA. This is reported by Reproductive Biology and Endocrinology.
Researchers examined data from more than 15,000 men aged 18 to 45, with samples collected from 2018 to 2024. The assessment was conducted using a unified methodology with a computer system for sperm analysis.
It turned out that the highest proportion of actively moving sperm was observed in the summer, in June and July, while the lowest levels were recorded in winter — in December and January. This trend was noted both in the temperate climate of Denmark and in the warmer Florida. Meanwhile, the overall volume of ejaculate and the number of sperm remained approximately the same throughout the year.
According to the researchers, the season affects not the process of sperm production but their motility. Even after adjusting for air temperature, the differences persisted, confirming the robustness of the observed effect.
The authors of the study note that the identified seasonality may be significant when assessing male fertility and planning for a child. Specialists believe that the time of year should be taken into account when analyzing sperm parameters.
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