Scientists finally understand why deep breathing physically reduces stress
Deep breaths. (Reuters/Stringer)
Our thoughts and emotions can influe
nce our physical states and vice versa. When we’re stressed, we tend to take short, rapid breaths of air. Conversely, mental health professionals often tell patients with anxiety or depression to take deep breaths as a way of calming down, and yoga practitioners know pranayama as the controlled breathing to shut down anxious thoughts during sessions.
But how this mind-body connection works has been something of a black box for brain researchers. On March 30, a group led by scientists at Stanford University Medical Center and the University of California-San Francisco published (paywall) work that illuminates the specific neurons that act as a bridge between mental and physical arousal. Understanding these cells could be used to develop new therapies for mental health conditions.
Breathing is an automated process controlled by a cluster of brain cells that sit on the brainstem. Unlike the neurons in charge of other automatic movement, like our heart’s beating, the group of cells that governs our breathing have to accommodate a lot more variety. “There are many distinct types of breaths: regular, excited, sighing, yawning, gasping, sleeping, laughing, sobbing,” Mark Krasnow, a biochemist at Stanford University and co-author of the paper, said in a statement. “We wondered if different subtypes of neurons within the respiratory control center might be in charge of generating these different types of breath.”
The team decided to break down this control center into distinct parts and attempt to spot the cluster that influence rhythmic breathing specifically. Working in mouse models (for obvious reasons), Krasnow and his team wiped out a patch of 175 neurons they selected based on previous knowledge of mouse genes associated with breathing. Then, they waited to see if their test mice started breathing erratically.
