Stress & Immune System
How stress duration and intensity affect the immune system β€” click on an area
Stress and Immune System Curve Diagram Immune Function Stress Duration & Intensity β†’ Baseline Tipping Point Minutes Hours Days Weeks Months BOOST NK Cells ↑ CRASH Immune Suppression 47% infection rate Cohen et al.
⚑ Acute Stress β€” Immune Boost
Short-term stress (flight response, exercise, exam situations) activates the immune system in an evolutionarily sensible way: small wounds from fleeing predators need to heal fast. The result: more Natural Killer Cells (NK cells) in the blood, faster immune response.
↑ NK
Natural Killer Cells after acute exercise
27 %
Infection rate at lowest stress index (Cohen et al. study)