Changes in lymphocyte and neutrophil function induced by a marathon race

Area of Science:

• Immunology
• Exercise Physiology

Background:

• Marathon running is a strenuous physical activity known to induce significant physiological stress.
• Understanding the impact of endurance events on immune cell function is crucial for athlete health and performance.

Purpose of the Study:

• To investigate the effects of a marathon race on the functional capacity of neutrophils and lymphocytes.
• To assess changes in plasma cytokine concentrations and cell death markers in athletes post-marathon.

Main Methods:

• Plasma levels of cytokines (IL-1ra, IL-6, IL-8, IL-10, TNF-α) and C-reactive protein (CRP) were measured.
• Neutrophil phagocytic capacity, cytokine production, and apoptosis were assessed.
• Lymphocyte cytokine production and apoptosis/necrosis rates were evaluated before and after the marathon.

Main Results:

• Plasma IL-6 and IL-1ra increased post-marathon, while CRP remained unchanged.
• Neutrophil phagocytic activity decreased, and apoptosis initially increased then decreased.
• Lymphocyte production of key cytokines (IL-2, TNF-α, IL-1β, IL-10) significantly decreased, with increased lymphocyte apoptosis and necrosis.

Conclusions:

• Marathon running impairs both neutrophil and lymphocyte function, with a more pronounced effect on lymphocytes.
• The observed increase in plasma cytokines was not directly from neutrophil or lymphocyte production.
• These findings suggest a temporary impairment of acquired immunity following intense endurance exercise.