Acute high-intensity exercise enhances T cell proliferation compared to moderate-intensity exercise

Area of Science:

• Immunology
• Exercise Physiology

Background:

• Conventional belief suggests high-intensity (HI) exercise suppresses immune function.
• Emerging research indicates HI exercise may positively influence immune responses.

Purpose of the Study:

• To quantify changes in T cell proliferative capacity after HI versus moderate-intensity (MI) exercise.
• To investigate the impact of exercise intensity on T cell function.

Main Methods:

• Sixteen males were divided into HI and MI exercise groups.
• Blood samples were collected at baseline and at intervals up to 6 hours post-exercise.
• T cell proliferation was analyzed using CD3+ T cells with phytohaemagglutinin or CD3+CD28 co-stimulation.

Main Results:

• T cell proliferative response significantly increased in the HI group up to 6 hours post-exercise.
• No significant changes in T cell proliferative ability were observed in the MI group.
• Serum stress hormones and cytokines did not correlate with the observed T cell changes.

Conclusions:

• HI exercise enhances T cell proliferative capacity, suggesting an exercise-induced activation.
• This heightened proliferative capacity indicates primed T cells for enhanced functional responses.
• HI exercise may bolster immune readiness rather than suppress it.