Breathe in slowly, deeply, and smoothly. Now, exhale slowly.
Did you feel a sense of calm?
Now breathe rapidly. Quickly in and out, in and out.
You probably felt a small surge of tension. Why?
Deep breathing has been used since ancient times to ease stress. But the question of why it works has never been answered by science…until recently.
Stanford University and University of California researchers analyzed what happens in the brain when different types of breathing occur.