LONDON, England, June 11 (TNSjou) -- BMJ Group issued the following news release about BMJ Open Sport & Exercise Medicine:

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Changes to the heart linked to marathon running vary by age, sex, and training level

But unclear if these represent normal physiological responses or long term (mal)adaptations

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Changes to the heart linked to marathon running vary by age, sex, and training level, finds a synthesis of the available da . . .

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