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Exercise is stress that ends
Stress with a finish line
In the middle of a jog, the heart pumps, breathing speeds up, and the muscles get more blood, which is a stress response. When the runner reaches the mileage goal and stops, the body gets the signal that the stress is over: sympathetic activity goes down, stress goes down, and the vagus nerves go up.
The idea is that this teaches the body how to come back down after being stressed, in the same way that a dose of manageable stress builds resilience.
What the studies found
A systematic review of 31 studies found reductions in cortisol after exercise. A randomized controlled trial found that people had fewer and less severe panic attacks after a 12-week exercise program.
Why does exercise help with panic attacks?
People prone to panic often fear the physical sensations of anxiety, such as a pounding heart and fast breathing. Exercise produces those same sensations in a setting where they have an obvious cause and a clear end. Psychologists call deliberate practice with these sensations interoceptive exposure, and it is a core part of cognitive behavioral therapy for panic disorder. Researchers have studied exercise as a form of it for decades.
Why does the heart slow right after a run?
Once exercise stops, the vagus nerve reactivates and pulls the heart rate down, mostly within the first minute. Trained athletes typically show a faster drop than sedentary people. Physiologists use this heart rate recovery as a standard marker of cardiovascular fitness. A 1999 study in the New England Journal of Medicine by Christopher Cole and colleagues linked slow recovery to higher mortality.
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