Just under 1% of the men overall reported being diagnosed with prostate cancer. Those who biked the most, >8.5 hours a week, were much more likely to have prostate cancer than the other men. Of the 498 men who biked the most, 17 said they had prostate cancer (3.5%). Of those who biked the least, three out of 511 (0.5%) said they had prostate cancer, the findings showed.
However, the findings aren’t definitive, and they conflict with previous research on impotence and infertility. Lead author Milo Hollingworth, MBBS, a research associate at University College London, acknowledged to HealthDay that the findings are “difficult to interpret.” He stressed that “men shouldn’t worry about increasing their risk of prostate cancer by cycling. Men should cycle as much as they did before. The benefits for your heart, lungs, whole body, and mental health are much more important.”
Yah, that’s about what I figured.