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

Distance runner Ashley Paulson of St. George has set a world record in the 100-mile ultramarathon. Friday night, the 44-year-old Paulson won the women's division of the Jackpot 100 Mile Ultra National ...

Maybe you jog for exercise. Maybe you've run 10Ks or marathons. But you haven't run nearly as far as this Utah man. Despite all odds, Eric Johnson has really gone the distance.

Add Yahoo as a preferred source to see more of our stories on Google. Scientists have long hypothesized about a theoretical limit to human energy use. Yet elite endurance athletes are constantly ...

By Dennis Thompson HealthDay ReporterTHURSDAY, Feb. 19, 2026 (HealthDay News) — Ultra-marathon runners must be incredibly fit to endure races that can extend more than 100 miles, but their bodies pay ...

Running extreme distances may strain more than just muscles and joints. New research suggests ultramarathons can alter red blood cells in ways that make them less flexible and more prone to breakdown, ...

From muscle fibers to mental grit, here’s the science behind why some bodies can endure ultramarathons, while others hit the wall far sooner. Ultramarathons sit at the far edge of what the human body ...

HealthDay News — Ultra-endurance running accelerates red blood cell (RBC) aging through inflammatory and oxidative pathways, according to a study published online Feb. 18 in Blood Red Cells & Iron.

Scientists provide proof that ultramarathon athletes’ red blood cells become less flexible after a long race, potentially reducing their ability to efficiently carry oxygen ...

Running is good for your health, but pushing it too far can take a hidden toll. New research shows that ultramarathons may ...

The marathon aims to attract world-class runners to the trails of Aroostook County and put the region on an international stage.

Middle-distance runs on mixed Peak District terrain reveal a shoe that feels purposeful – but not without compromise ...