"The IOC was shocked by what we saw from the World Cup in Doha and does not want anything similar to happen in Tokyo," said John Coates, chairman of the IOC's coordination commission.
He says that the start times have been discussed at 03:00 in the marathon, but that it would be impractical from the transport point of view and that it is difficult with television broadcasts in the dark.
The men's marathon is scheduled to end the Tokyo Games on August 9, and so far it remains in its original version on the official site.
Tokyo's mayor wants the IOC to explain in more detail why one should move to such an important competition so soon at the games where much has already been prepared. Tokyo was awarded the games as early as 2013 following a compact concept that 85 percent of the branches would be settled within eight kilometers of the city center, something that breaks during a marathon move and walk.
- Who proposed this and when did you come to this decision? That's something I want to discuss, "Mayor Yuriko Koike told Reuters. She will soon have a meeting with IOK and Coates.
Although the marathon and walking competitions in the Qatar Athletics World Cup were decided at midnight, many activists were affected by the heat and humidity and forced to break.
Sapporo 80 miles north of Tokyo has five, six degrees colder temperatures than the capital.