What happens to your body when you run a marathon?

Here's how those 26.2 miles affect your body, from heart and joints to sweat glands and blood volume

Analysis: here's how those 26.2 miles affect your body, from heart and joints to sweat glands and blood volume

The starting line As you wait anxiously in anticipation for the race to start, the stress hormone adrenaline will increase and cause your heart rate to increase. Your brain will also send a signal to your lungs to increase your breathing. In the absence of proper hydration, heat loss will be impeded, blood volume will decrease and your heart rate may start to drift upwards without any change in effort or breathing. Dehydration may occur more rapidly and the risk of early fatigue and heat-related illnesses may increase, especially if the race day turns out to be unexpectedly warmer than normal or if the humidity level is high.

The extra energy will come from burning a combination of glucose and fat, with glucose being the preferred fuel. However, humans can only store about 2,000 calories of glucose compared to the 700,000 to 100,000 calories we can store as fat. Runners burn roughly 100 calories of glucose for every mile of the marathon. That means you will have burned your entire supply of glucose after 32 km and will start to rely almost exclusively on fat for fuel.

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