http://onlinelibrary.wiley.com/doi/full/10.1111/j.1464-410X.2008.07815.x
Studies on volunteers have shown that cycling while standing off the
saddle does not alter penile blood supply after exercise, which remains
the same as before exercise [
4
].
Numbness of the genital region is reported by >60% of the cyclists.
There is a greater incidence of numbness and erectile problems in men
who cycle regularly for longer training distances. As described earlier,
penile blood flow is affected due to the compression of vessels by
sitting on the saddle. In extreme cases endothelial injury can lead to
vasculogenic ED [
5
].
This can be accentuated by the hard surface of the saddle. The
neuropraxia of the pudendal nerve which supplies the posterior part of
scrotum and base of penis can also lead to penile numbness and altered
sensation during ejaculation [
6
].
It is important therefore to rest intermittently during prolonged and
vigorous bicycle riding, thereby restricting the training distance.
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