Epidemiological, biological and clinical update on exercise-induced hemolysis

Area of Science:

• Sports Medicine
• Hematology
• Physiology

Background:

• Exercise-induced hemolysis involves the rupture of erythrocytes (red blood cells) during physical activity.
• It is a common occurrence in various forms of running, from short to ultra-long distances.

Purpose of the Study:

• To define exercise-induced hemolysis and review its prevalence and contributing factors.
• To explore the mechanisms and consequences of red blood cell destruction during exercise.

Main Methods:

• Epidemiological data review on hemolysis biomarkers (haptoglobin, free hemoglobin).
• Analysis of erythrocyte fragility, membrane structure, and lifespan in runners.
• Identification of mechanical and metabolic factors contributing to hemolysis.

Main Results:

• Commonly observed post-exercise, indicated by decreased haptoglobin and increased free hemoglobin.
• Typically mild (1.2-1.8 fold variations) and self-limiting (resolves within 24-48 hours).
• Erythrocyte lifespan is reduced by approximately 40% in runners compared to sedentary individuals.

Conclusions:

• Exercise-induced hemolysis is a paraphysiological phenomenon influenced by exercise intensity and ground contact, but not running technique.
• Mechanical stress and metabolic changes during exercise contribute to red blood cell damage.
• Individuals with pre-existing erythrocyte disorders may be more susceptible to exercise-induced hemolysis.