Olympic champion Keely Hodgkinson is among those to have voiced concerns.

World Athletics has underscored its commitment to the "athlete experience" after some competitors at the world championships in Tokyo - including Olympic champion Keely Hodgkinson - criticised the warm-up logistics.

Yoyogi Park, where the main warm-up facility is located, is a two-and-half-kilometre drive from Japan National Stadium, a bus journey the PA news agency understands takes about 15 minutes on average.

Final call for competitors to catch the bus, PA understands, is scheduled for 50 minutes to an hour before the start of an event.

Once arrived, athletes can also make use of an indoor straight at the stadium, including days when they have more than one race in the same session, like semi-finals and finals.

A World Athletics statement read: "The athlete experience is of utmost importance for World Athletics and the Local Organising Committee at these World Athletics Championships, and we have put a lot of consideration into their preparations within the constraints of locations and venues.

"This type of configuration is not unique - as we have seen from previous Olympic Games and other major athletics championships.

"For Tokyo 25, we ensured that team leaders were fully briefed at a site visit in March in order for teams to have ample time to prepare - and the rules regarding warm up, call room, and transport apply to every team and every athlete without exception."

On Friday, after securing her place in Sunday's 800m final, Hodgkinson said: "I think the whole warm-up situation, you're warming up for almost two hours. It can be quite draining, so maybe we will have to look at doing something better come Sunday.

"But other than that, I'm happy to be in my fifth world (including Olympic) final in a row. That's an achievement in itself. I'm really happy to do that and be in the picture for another medal, hopefully."

Only athletes are permitted to board the bus that takes them to the stadium, turning it into a kind of call room on wheels, where they might even disagree over things like the ideal air conditioning setting inside the vehicle.

Last Saturday, speaking after their 1500m heats, American middle-distance runner Nikki Hiltz told Citius Mag: "I was joking with (Ireland's) Sophie O'Sullivan on the ride over, like, 'should we make a TikTok?

"But it's a solid 10-minute bus ride of just sitting. It's just weird. It's definitely not usual, but we're all in the same boat."

Jamaican coach Stephen Francis was more critical. In an interview with his country's TVJ news, posted to the outlet's Instagram on Saturday, Francis described what he felt were a number of logistical issues, including the "distance from the stadium to the warm-up track".

He added: "Those areas of a meet are not befitting the top meet of the year for World Athletics."

World Athletics defends warm-up logistics in Tokyo after criticism