This can cause digestion problems and discomfort. Imagine trying to replace 2.8 litres of fluid an hour while running. Some runners, depending on the environment, will lose up to 2.8 litres of sweat per hour, which results in a loss of salts too. If participants aren’t able to meet their calorific demands through food, they can end up in considerable energy deficit, with the body using its own muscle mass and fat as fuel. This type of distance alone puts immense stress on the body. The Marathon des Sables in the Sahara and the Last Desert in Antarctica each cover 250km. Athletes often compete in extreme conditions. Godong / Alamy Stock Photo Physical stressesĪn ultramarathon is a race that exceeds the 42.2km distance of traditional marathons. The Ultra-Trail du Mont-Blanc is an annual single-stage mountain race in the French Alps.
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