Breath and stress – a direct connection to the nervous system
Breath has a direct connection to the autonomic nervous system via the vagus nerve: rapid, shallow breathing strengthens the "fight or flight" response, while slowed breathing with an extended exhale activates the parasympathetic system.
Research shows that practicing slow, deep breathing reduces heart rate, lowers blood pressure, increases heart rate variability (HRV) and subjectively reduces tension and anxiety.
How does breathing regulate the nervous system?
During inhalation the sympathetic system temporarily predominates – the heart speeds up and the body mobilizes; during exhalation vagal activity increases, slowing heart rate and supporting calming.
Techniques of slow breathing (about 5–7 breaths per minute) increase cardiac vagal activity and HRV, considered markers of nervous system flexibility and better emotion regulation.
Experimental studies have shown that slow breathing reduces reactivity to stress stimuli, lowers subjective anxiety levels and affects brain activity patterns associated with arousal. This explains why simple breathing exercises can help in moments of sudden tension, even if they do not solve the underlying cause.
How to breathe during anxiety? Example exercises
The literature describes several simple breathing techniques that can support nervous system regulation:
Diaphragmatic (abdominal) breathing
Slow inhalation through the nose "into the belly" for 4–5 seconds, gentle lifting of the lower ribs;
calm exhalation through the mouth for 6–8 seconds.
This pattern activates the parasympathetic nervous system, increases the sense of "room in the chest" and reduces tension.
Breathing with a longer exhale (e.g. 4–6, 4–8)
Inhale for 4 seconds, exhale for 6–8 seconds, repeated for several minutes.
Studies suggest that exhale‑dominant breathing reduces anxiety and activates the parasympathetic system faster than breathing with equal phases.
"Box breathing" (4–4–4–4)
Inhale 4 seconds – hold 4 seconds – exhale 4 seconds – pause 4 seconds.
Technique used among others. in high‑stress situations to stabilize breathing and attention; it improves HRV and subjective sense of control.
Humming / humming exhale breathing
Slow inhale through the nose, exhale with a soft humming or "mmm" on a long exhale.
Research suggests that such breathing increases HRV similar to classic slow breathing and is experienced as particularly relaxing.
These techniques can support stress and anxiety regulation but do not replace psychiatric treatment or psychotherapy where indicated.
Breath in a holistic approach
In holistic psychiatry breath is treated as one of the tools for working with the nervous system – alongside pharmacotherapy, psychotherapy, sleep, movement and lifestyle.
Practical breathing exercises can be tailored individually: for some a short "4–6" exercise before a meeting works best, for others a few minutes of diaphragmatic breathing before sleep or during a break between tasks.
In the Holistica model – holistic psychiatry online – breath often forms part of psychoeducation and practice between sessions, especially when working with chronic stress, anxiety and somatic tension symptoms.
Selected sources
Parasympathetic breathing and stress regulation – review of slow breathing techniques. 2023.
Slow breathing and anxiety: EEG and HRV study. 2024.
Benefits from one session of deep and slow breathing on vagal tone and relaxation. Sci Rep. 2021.
Slow‑paced and humming breathing: effects on HRV and tension. 2025.
Simple breathing exercises to manage stress. American Lung Association / other educational materials. 2024–2026.
The information in this article is general and educational in nature.
It does not constitute medical advice or individual diagnostic or therapeutic recommendations.
Decisions about starting, continuing or changing treatment, including modifying doses of antidepressant medications, should be made only after consultation with a physician, taking into account the patient’s full clinical picture.
