Exercise and inflammation in pediatric Crohn's disease

Area of Science:

• Exercise physiology
• Pediatric gastroenterology
• Immunology

Background:

• Crohn's disease (CD) is a chronic inflammatory condition affecting youth.
• Exercise is often recommended for managing chronic diseases, but its impact on inflammation in pediatric CD requires further investigation.
• Understanding exercise-induced immune responses is crucial for developing safe and effective physical activity guidelines for youth with CD.

Purpose of the Study:

• To compare the acute inflammatory, immune cell, and growth factor responses to moderate-intensity continuous exercise (MICE) and high-intensity intermittent exercise (HIIE) in youth with CD and healthy controls.
• To determine if different exercise intensities exacerbate inflammation in pediatric CD patients.
• To assess the safety of distinct exercise modalities for youth with Crohn's disease.

Main Methods:

• 15 youth with CD and 15 healthy controls underwent MICE (30 min cycling at 50% peak mechanical power) and HIIE (6 bouts of 15s cycling at 100% peak mechanical power).
• Blood samples were collected at rest, mid-exercise, end-exercise, and 30 and 60 minutes into recovery.
• Analyzed inflammatory cells (leukocytes, neutrophils, lymphocytes, monocytes), cytokines (IL-6, IL-17, TNF-α), and growth factors (GH, IGF-I).

Main Results:

• Both MICE and HIIE increased immune cells and growth hormone (GH), and decreased insulin-like growth factor-I (IGF-I) in CD patients.
• MICE induced a greater increase in leukocytes, neutrophils, lymphocytes, monocytes, IL-6, IL-17, and GH compared to HIIE.
• Monocyte levels remained elevated longer in CD patients following MICE; TNF-α did not significantly change with either exercise type. Patient responses were largely similar to controls.

Conclusions:

• Youth with Crohn's disease can participate in both moderate-intensity continuous exercise and high-intensity intermittent exercise without significant acute inflammatory exacerbation.
• Exercise elicits comparable immune and growth factor responses in youth with CD and healthy controls.
• Monocyte response duration differs between exercise types in CD patients, suggesting careful consideration of exercise prescription.