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Does biking and extreme exercise effect male fertility? how?
Certainly high temperature in the scrotum does. It is normally around 96 degrees, lower than body temperature. Hot-tub type temperature can reduce sperm count dramatically. And certain men, with biking, have a reduction in sperm counts. Plenty of men who bicycle don't have fertility problems. But for some, it does affect fertility. The best thing to do is check sperm counts. That can be easily done by having a lab check an ejaculation sample. It's best to see a lab that does a infertility work regularly.
And there are other lifestyle issues for men. One is binge alcohol drinking, another is use of recreational drugs -- they have been shown in acute high doses to cause problems with sperm counts. The problem is that these things affect sperm count two to three months later, so it's difficult to know whether the problem you see is something short-term or something chronic. It takes time to sort these issues out.
The issue is increased temperature to the testes. That is why they are located outside the body. Super exercise and stress, as in women, affect brain hormones and sperm counts. There are two parts to this. One, how stressed is the man by the exercise? If it's real stressful, it affects fertility. And two, did the exercise raise the temperature of the testes?
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