Dangerous exercise: lessons learned from dysregulated inflammatory responses to physical activity.

Area of Science:

• Immunology
• Exercise Physiology
• Pathophysiology

Background:

• Exercise normally stimulates a controlled inflammatory response.
• This response can become dysregulated, leading to detrimental health outcomes like exercise-induced anaphylaxis, asthma, and overuse syndromes.
• A key mechanism may involve exercise modulating previously activated leukocytes, increasing their responsiveness.

Purpose of the Study:

• To explore the pathophysiological mechanisms behind "dangerous exercise."
• To understand how exercise can disrupt the balance between pro- and anti-inflammatory responses.
• To investigate the role of leukocyte modulation in exercise-related inflammatory conditions.

Main Methods:

• Conceptual review of exercise immunology and pathophysiology.
• Analysis of potential mechanisms, including leukocyte redistribution and altered neutrophil apoptosis.
• Discussion of immune tolerance and training-associated changes in innate immune response.

Main Results:

• Dangerous exercise involves an upset in the pro- and anti-inflammatory balance.
• Exercise can increase the responsiveness of previously activated leukocytes.
• Mechanisms like neutrophil apoptosis inhibition in overuse syndromes contribute to prolonged inflammation.
• Exercise-induced inflammatory responses can alter subsequent immune reactions.

Conclusions:

• The immune stress response to exercise is potent and can lead to health issues when dysregulated.
• Understanding these failed homeostatic mechanisms offers potential for clinical translation.
• Further research into immune tolerance and training effects is warranted.