Not for me but this guy died of it doing the Brighton Marathon and there's a few quotes in there that I thought might apply to cyclists;
We know that up to half of people who run marathons develop symptoms relating to their gastro-intestines.
"They can be minor stomach cramps, diahorrea, but on the other end of the scale, ischemic bowel can be exhibited in endurance exercise."
He added: "When it gets to that critical stage, depending on how much of the bowel has died, depends on whether the person can survive.
Gastro-intestinal problems suffered by people associated with endurance sport were being increasingly examined in studies, Dr Taylor added.
not really much to help identify if you have it, really, from what it says.