Extreme endurance training is often seen as a sign of strong physical fitness. However, new research indicates that very long-distance runs may have negative effects on the body.

Extreme endurance running damages red blood cells in ways that may affect their ability to function properly, according to a ...

After a long trail race, some of your red blood cells may not bend the way they should. That matters because red blood cells have a tight job description.

A study shows ultramarathon running induces oxidative stress and structural damage in red blood cells. Multiomics analyses ...

Human bodies make 2 million red blood cells per second. They each live for 120 days and spend that time zooming completely around the body every 20 seconds, carrying oxygen from the lungs to other ...

Running extreme distances may strain more than just muscles and joints. New research suggests ultramarathons can alter red ...

Scientists have long known that people living at high altitudes, where oxygen levels are low, have lower rates of diabetes ...

Learn more about the impact ultramarathon running has on red blood cells and how it may do more harm than good for the body.

Ultramarathons might push red blood cells past their limits—accelerating their aging in the process.

Your blood cells work tirelessly to keep you alive, carrying oxygen throughout your body and fighting off infections. But hidden in your daily meals are foods that can silently compromise these vital ...