Marathon runner 'died of heart failure', says doctor

The doctor who performed the post-mortem on Claire Squires, who died during last year's London Marathon, has told an inquest that she died of heart failure, likely complicated by the supplement DMAA.

The caffeine-like stimulant was in the runner's drink, and has since been banned in the UK.

"DMAA causes increased heart rate. On the balance of probability I think the DMAA was a contributing factor to her death' Dr Van Der Walt said.

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Drinks firm defends stimulant

The makers of an energy drink consumed by marathon runner Claire Squires before she died during the London Marathon have defended the use of a now-banned stimulant.