Breathwork Techniques for Stress Relief

The relationship between breathing and the autonomic nervous system is well-established in physiology. When breathing rate drops and exhalation lengthens relative to inhalation, heart rate variability tends to increase and the parasympathetic nervous system becomes more active — a pattern associated with reduced subjective stress and improved emotional regulation.

What follows is a description of three techniques that have been studied in peer-reviewed contexts and are accessible without any equipment. They are suitable for use in office settings, transit, or at home. They do not require silence or a particular posture, although sitting upright with feet on the floor makes the physical mechanics easier.

Diaphragmatic breathing

Diaphragmatic breathing — sometimes called abdominal or belly breathing — involves using the diaphragm as the primary muscle of inhalation rather than the chest muscles. Most adults under chronic stress develop a habit of shallow chest breathing, which keeps the sympathetic nervous system slightly elevated throughout the day.

How to practise

1. Sit or lie in a comfortable position. Place one hand on the chest and one on the abdomen just below the ribcage.
2. Inhale slowly through the nose for four counts. The hand on the abdomen should rise; the hand on the chest should remain relatively still.
3. Exhale through the mouth for six counts, allowing the abdomen to fall.
4. Repeat for five to ten cycles.

The extended exhalation is the mechanically important part. Exhalation activates the vagus nerve, which slows heart rate. A ratio of approximately 1:1.5 or 1:2 (inhale to exhale) is consistent with the patterns observed in biofeedback research.

Box breathing

Box breathing — also called four-square breathing — uses equal-duration phases: inhale, hold, exhale, hold. The name refers to the four equal sides of a square. It has been used in high-stress occupational contexts and is described in the United States Navy SEAL training documentation, though its use in general stress management predates that association.

How to practise

1. Exhale fully to begin.
2. Inhale through the nose for four counts.
3. Hold the breath for four counts.
4. Exhale through the mouth for four counts.
5. Hold the empty lungs for four counts.
6. Repeat four to six times.

The count of four seconds per phase is a starting point. Some practitioners work with six or eight seconds per phase once the pattern feels natural. The breath-holds are a distinguishing feature: they create brief, mild hypercapnia (increased carbon dioxide) which has a demonstrated calming effect on the nervous system when controlled.

Box breathing is particularly useful before a stressful event — a presentation, a difficult conversation, an exam — rather than during acute distress when cognitive focus is harder to maintain.

The physiological sigh

The physiological sigh is a naturally occurring breathing pattern that humans and many mammals perform spontaneously, usually once every few minutes, to reinflate collapsed alveoli in the lungs. Research from Stanford University's Department of Psychiatry and Behavioural Sciences (Balban et al., 2023, published in Cell Reports Medicine) compared deliberate versions of this breath against other breathing techniques and found it produced the fastest reduction in self-reported anxiety of the patterns tested.

How to practise

1. Take a normal inhalation through the nose.
2. At the top of the inhale, before exhaling, take a second short sniff to fill the lungs a little further.
3. Exhale fully and slowly through the mouth, taking longer to exhale than to inhale.
4. Repeat one to three times.

The double inhale is what distinguishes this technique. It recruits additional lung volume and accelerates the offloading of carbon dioxide on the extended exhale. Unlike box breathing, it does not require counting or a quiet environment — it takes about ten seconds and can be done at a desk or on a crowded subway platform.

Breath control is notable among autonomic processes in that it can be engaged voluntarily, making it one of the few direct entry points to the nervous system that does not require pharmaceutical or technological intervention.

Which technique for which situation

These three techniques serve overlapping but distinct purposes:

• Diaphragmatic breathing is best for a sustained session of five to fifteen minutes when the goal is a gradual, cumulative calming effect. Suitable for mornings or before sleep.
• Box breathing is better for moments of anticipatory stress — when a specific event is approaching and cognitive steadiness is the priority.
• The physiological sigh is the fastest-acting of the three and the most suitable for use in public or during brief pauses, when a full session is not possible.

Breathwork in the Canadian seasonal context

In provinces with pronounced seasonal variation — which includes most of Canada — the period from November through February tends to bring increased indoor sedentary time and reduced light exposure. These conditions are associated with higher rates of reported stress and mood difficulty. Breathwork requires no outdoor access, no special equipment, and is not affected by temperature, making it practically more accessible during winter months than exercise-based stress reduction for many people.

The Public Health Agency of Canada includes controlled breathing among the self-management strategies listed in its mental health promotion materials. CAMH also references breathwork as a component of several stress management approaches in its publicly available resources.

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For further reading on breathwork and the autonomic nervous system, the following publicly accessible resources are informative: the Huberman Lab podcast episode on breathing (Stanford Neuroscience, 2021) and the original MBSR manual available through the Center for Mindfulness at UMass Chan Medical School.