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In recent years, scientists have come to understand that consciously controlling your breath can have huge benefits on your overall system, primarily with regard to the regulation of your nervous system in relation to anxiety, depression, and restlessness. The vagal response is the stimulation of the vagus nerve, which runs down along the anterior portion of your spine from your brain to your internal organs. When the vagus nerve is stimulated, a signal is sent to the brain to reduce your blood pressure and calm your body and mind, reducing stress and helping to manage chronic illness, as healing can happen only in a more relaxed state of being. For example, if your amygdala, the nerve center at the lower-central part of your brain, is agitated, it triggers your sympathetic nervous system (SNS) and your fight-or-flight response. You may become anxious, fearful, reactive, or frozen. Once triggered, this response lasts at least 20 minutes, but you can often find yourself stuck in this state for much longer. According to Dr. Mladen Golubic, an internist at Cleveland Clinic’s Center for Integrative Medicine, when in this state, you take shallow chest breaths, sometimes halting the breath completely, extending the effects of your SNS response. By taking deeper and fuller breaths, especially by allowing the abdomen to relax and expand, the vagus nerve is stimulated, and calm can quickly be restored. This calming and stress-reducing response is called the parasympathetic nervous system (PNS) response, or vagal response. When your SNS is calmed, you have more access to the prefrontal cortex of your brain, boosting your ability to think clearly and rationalize. Dr. Golubic goes on to say, “The vagal response reduces stress. It reduces our heart rate and blood pressure.” This regulation of the nervous system is one of the primary benefits of a consistent pranayama practice.
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Jerry Givens (Essential Pranayama: Breathing Techniques for Balance, Healing, and Peace)