With about six hours left to ride Hogg was leading the race but failed to come into the drinks station.
Race officials went looking for the 34-year-old Dunedin Landscape Centre manager and found him sitting on the track next to his bike.
His mother Carolyn told the Otago Daily Times yesterday he was very angry.
"After a few rounds he had a bad back but kept going and was in the lead for probably three-quarters of the jolly race. We don't really know what happened but it was 35 or 36degC and perhaps he is not used to it, I don't know.
"But he came in for a feed and he felt dizzy and nauseous. So he sat down and ate his food and could not get up again. They got him up and he headed off into the darkness."
Hogg did not come into the next feed station and when the officials found him he was dehydrated, his blood sugar was low and he was forced to withdraw from the race.
"That is the name of the game, I'm afraid. It is a tough, tough race and it wasn't his day," Mrs Hogg said.
While Hogg led for long periods, Australia's Jason English and Andy Fellows, and Cary Smith of the United States were always close.
English eventually won the elite men's race and in the elite women's race was won by United States rider Rebecca Rusch, who claimed her second world title.
