Slow breathing and coming back to the present

What happens when breathing slows down

When we are tense, breathing tends to become short and fast. Breathing more slowly, on purpose, is one of the few ways to act directly on a system that usually runs by itself. A 2018 review brought together studies of healthy adults breathing ten times a minute or less and often found higher heart rate variability, a marker linked to the calming side of the nervous system, along with reports of more relaxation and less anxiety.

A 2022 meta-analysis of more than two hundred studies confirmed that slow breathing raises this variability during practice and shortly afterwards. These findings are about the body rather than mood itself, but they help explain why the technique is so widely used.

What research says about stress and anxiety

A 2023 meta-analysis of randomised controlled trials found a small-to-medium reduction in self-reported stress among people who practised breathing exercises, compared with control groups. There were also effects on anxiety and depressive symptoms. The authors themselves warn, however, that many studies had a moderate risk of bias and that the effect was not significant in people with a clinical diagnosis.

The same year, a trial with 400 people compared slow breathing with breathing at a normal pace, used as a placebo, over four weeks. Both groups improved, and by the same amount. One reading is that part of the benefit comes from stopping for a few minutes a day to look after yourself, more than from the exact rhythm.

The honest conclusion is this: slow breathing is safe, cheap and can help you get through a tense moment. It is not a treatment for an anxiety disorder or for depression.

How to practise box breathing

Box breathing is a simple way to slow down: breathe in for a count of four, hold for four, breathe out for four and wait again for four. Each round takes about sixteen seconds, or fewer than four breaths a minute. We found no studies of this particular pattern; it is simply an easy way to remember and keep a slow pace.

Sit with your feet on the floor. Breathe through your nose without forcing it. If holding your breath is uncomfortable, shorten the pauses or skip them. The UK health service suggests an even simpler version, counting from one to five as you breathe in and out, and notes that the biggest benefit comes from regular practice, a few minutes every day.

If you feel dizzy, go back to breathing normally.

Coming back to the present

Grounding techniques, such as noticing five things you can see, four you can hear and three you can feel, try to move attention from your thoughts to what is happening right now. They are widely recommended for moments of overwhelm and carry little risk.

It is worth knowing, though, that we found no clinical trials testing these techniques as a treatment. Use them to support you through a hard moment, not as the answer to distress that keeps coming back.

When it is not enough

If anxiety shows up every day, if panic attacks keep happening or if breathing does not help you through the moment, see a professional. Breathing exercises can be part of care, alongside treatments with stronger evidence.