With six hours left, Hogg was leading the race but he collapsed in a meadow after a feeding station.
"I was in the lead and feeling good when I came into a feeding station at 2am," Hogg told the Otago Daily Times yesterday.
"I felt dizzy and nauseous. I sat down and ate my food and could not get up again.
"I changed the batteries on my light and tried to eat but I fell over. The officials got me up, sat me on my bike and I headed off into the darkness."
Hogg was leading eventual winner Jason English and fellow Australian Andy Fellows, and Cary Smith (United States) at the time.
"I was in a meadow halfway around the lap when my vision went and I just lay on the ground. I had nothing left," he said.
Hogg was pulled out of the race at that time and it was only later that he found that his blood sugar level was too low.
"It was down to a count of two and it should have been between four and eight," he explained.
Hogg (34), manager of the Dunedin Landscape Centre, had never had this happen to him in the shorter endurance events.
It was only his second 24-hour race. It was a lot colder in his first race in the New Zealand championships at Rotorua.
"The temperature was 36 degrees," he said. "It was also at an altitude of 1450m. That was higher than I had ever raced in New Zealand."
Hogg was naturally disappointed but saw something positive in his performance.
"I was leading and should gave won it," he said.
"I know I'm competitive on the world stage. I would have been more upset if I'd been blown out of the water."
Hogg has only raced two 24-hour races and said he was inexperienced when competing in the longer endurance event.
"I will need to seek advice from nutrition experts on my diet before the next race," he said. "I have missed something essential in my diet and will need the advice of a dietitian."
Other hazards in the Canadian race included cougars and grizzly bears living close to the course.
Hogg intends to take a two month break from racing before he begins his preparation for next year's 24-hour race, which will be held either in Canberra or Brisbane.
"I have been invited to race in Australia in November," he said. "It would be good to get used to Australian conditions before next year. I still have some unfinished business."
