Marathon victim died from drinking too MUCH water

David Rogers, 22, who died after drinking too much water during the London Marathon

David Rogers collapsed at the end of the race and died yesterday in Charing Cross Hospital.

Today it emerged the fitness instructor from Milton Keynes died from hyponatraemia, or water intoxication.

This is when there is so much water in the body that it dilutes vital minerals such as sodium down to dangerous levels. It can lead to confusion, headaches and a fatal swelling of the brain.

In 2003 St Thomas' Hospital treated 14 runners for the condition.

The marathon on Sunday was the hottest in the event's 27-year history. Temperatures peaked at 23.5C, with "radiated heat" from the road reaching 27.5C.

Rogers' death came as race organisers faced criticism over water supplies running out at certain parts of the course, despite temperatures nudging 75F (23.5C).

As thousands were treated for heat-related illnesses and dehydration, sports experts called for the event to be held earlier in the year when temperatures are lower.

However Dr Sanjay Sharma, Medical Director of the marathon, said he did not believe the cause of Rogers' death was heat related.

A London Marathon spokeswoman said every care was taken to ensure runners were fit to compete.

More than 600 runners failed to complete the 26.2 mile course - including long-distance running legend Haile Gebrselassie who pulled out after 19 miles - as the unseasonable heat took its toll.

Mr Rogers, who finished the race in 3hr 30mins, was the ninth runner to die since the first London Marathon in 1981.

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His father, Chris Rogers, 52, paid tribute to "a happy-go-lucky lad who brought happiness to everyone".

Mr Rogers, of Westoning near Bedford, and his wife, Sarah, saw their son at Tower Bridge when he was "ecstatic", but at the end of the race learned he had been taken to hospital.

One medical expert said: "Ironically, hyponatraemia is more dangerous than dehydration."

A spokesman for the race said: "There were 27,600 bottles of waters on those stations on the latter half of the course. Some water stations did run out, even though we had brought in extra water."

Gordon Trevett, of the Department of Exercise and Health Sciences at Bristol University, said the event should be held earlier in the year as the sweltering weather put runners' health under greater strain.

He said: "I think it would be a good idea to move the marathon forward so competitors can run in lower temperatures."

But London Marathon chief executive Nick Bitel said the event would continue to be held at the same time of year.

He said: "Some people think the marathon should be later in the year so they can train in warm weather, and some people like to train in summer and think that a winter marathon would be better. We think we are at the right time of year."