A marathon can send heart warning signals soaring, but what those alarms really mean is far from settled

MedicalXpress | juin 09, 2026

Changes to the heart linked to marathon running vary by age, sex and training level, finds a synthesis of the available data, published in BMJ Open Sport & Exercise Medicine. But it is not clear whether these changes represent normal physiological responses to endurance exercise or long-term maladaptations, the findings indicate.