Extreme Endurance Runs and Their Impact on Red Blood Cells

The Effects of Prolonged Running on Red Blood Cells

Research indicates that participating in extreme endurance runs can lead to damage of red blood cells. These cells become less flexible, which accelerates their breakdown. The longer the distance, the more pronounced the signs of cellular stress.

Mechanisms of Damage

During ultramarathons, the destruction of healthy red blood cells is observed, which can potentially result in anemia. Recent studies have shown that after long-distance runs, red blood cells lose the flexibility needed to pass through the smallest blood vessels. This limits their effectiveness in transporting oxygen and removing metabolic waste.

Blood analysis of athletes before and after participating in 40 km and 171 km races revealed signs of red blood cell damage caused by both mechanical and molecular factors. Mechanical stress is linked to changes in fluid pressure during intense circulation, while molecular damage is associated with inflammation and oxidative stress that occurs when antioxidants are insufficient.

Dependence on Distance Length

Signs of accelerated aging and destruction of red blood cells were detected even after a 40-kilometer run and became more pronounced following a 171-kilometer marathon. The data suggest that longer distances result in a greater number of damaged and destroyed red blood cells.

Implications for Sports and Medicine

The findings may contribute to the development of personalized training, nutrition, and recovery strategies to enhance performance and reduce potential harm from extreme physical exertion. The data are also relevant for medicine: blood intended for transfusions begins to lose quality after several weeks of storage and must be discarded after six weeks according to FDA standards in the USA. Understanding the effects of physical stress on red blood cells can help improve methods for storing donor blood.

Limitations and Future Research

The study involved a small group of athletes without racial diversity, and blood samples were collected at only two time points. Future research aims to expand the sample size, collect additional samples, and conduct more detailed measurements after races. There are also plans to explore ways to extend the shelf life of donor blood.