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The race and marathon walking in next summers Tokyo Olympics have been transferred into Sapporo – 800km to the north because of its conditions.
Steps to combat the heat in the Western capital, including water sprays and shade, are trialled at evaluation occasions.
International Olympic Committee president Thomas Bach said athlete welfare had beenin the core of fluctuations.
Sapporo can be up to six degrees cooler than Tokyo in peak summer.
International Association of Athletics Federations president Lord Coe said:Giving athletes the ideal platform for their performances within the environment they are in is central to all significant events, and well work with the organisers to make the best marathon and race wander paths for next years Olympic Games.
Tokyo 2020 event changes
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Evaluation from the BBC sports editor, also comment from other correspondents
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