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flag Ultramarathons damage red blood cells, reducing their ability to carry oxygen, according to a new study.

flag A new study finds that extreme endurance running, especially ultramarathons, causes mechanical and molecular damage to red blood cells, reducing their flexibility and oxygen-carrying ability. flag Researchers analyzed blood from 23 runners before and after races up to 171 kilometers, observing changes resembling those in blood stored for six weeks. flag Damage increased with race length, linked to inflammation, oxidative stress, and physical strain. flag While the study doesn’t confirm long-term health effects or recovery time, it suggests extreme exercise may accelerate red blood cell aging. flag Researchers call for further study on recovery and mitigation strategies.

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