Breathing Techniques

When you’re anxious, overwhelmed, or caught in a wave of panic, breathing is one of the fastest ways to shift your nervous system back toward calm. It’s also one of the most misunderstood. Search the internet and you’ll find dozens of techniques, most promising dramatic results. Some work. Some don’t. Some work, but not for the reasons their advocates claim.

This post skips the noise. It covers two breathing techniques that have strong empirical support and are distinct enough from each other to serve different needs. One is for acute moments when you need to calm down in minutes. The other is a practice technique that, over time, trains your nervous system to be more resilient.

If you’re looking for foundational techniques like diaphragmatic (belly) breathing, 4-7-8 breathing, or box breathing, those are covered in our companion post on stress and relaxation. What follows are two techniques to add when you’re ready to go deeper.

Cyclic Sighing: The Fastest Way to Shift Your Nervous System

Cyclic sighing is a breathing pattern with an unusual shape: inhale through the nose, take a second quick inhale on top of the first, then exhale slowly and completely through the mouth. Repeat for about five minutes.

If that pattern sounds familiar, it’s the physiological sigh extended into a sustained practice. The physiological sigh is something your body already does spontaneously. You’ve probably noticed it happen after crying, during deep sleep, or when you suddenly relax after holding tension. The body does it on its own to re-inflate collapsed air sacs in the lungs and offload accumulated carbon dioxide. Cyclic sighing takes that natural reflex and deliberately extends it into a short practice.

Why It Works

The double inhale opens up lung capacity more fully than a single breath. This matters because when we’re anxious, our breathing tends to become shallow and rapid, which leaves alveoli (the tiny air sacs in the lungs) under-inflated. The long, slow exhale that follows maximizes carbon dioxide offloading and stimulates the vagus nerve, which signals the parasympathetic nervous system (the “rest-and-digest” system) to take over.

In 2023, researchers at Stanford led by David Spiegel and Andrew Huberman published a randomized controlled trial comparing cyclic sighing to box breathing, cyclic hyperventilation, and mindfulness meditation over four weeks. Participants practiced for five minutes per day. Cyclic sighing produced the largest improvement in mood and the greatest reduction in respiratory rate. This matters because respiratory rate is a direct index of nervous system arousal. Slower, steadier breathing correlates with lower anxiety, better sleep, and more stable emotional regulation.

The study, published in Cell Reports Medicine, is notable because it was designed with proper controls and measured outcomes with validated instruments. A lot of what you’ll read about breathing techniques rests on small, poorly-controlled studies or pure tradition. This one meets a higher standard. For readers interested in the broader body of work on breath and physiology, Huberman discusses these topics regularly on the Huberman Lab podcast.

How to Practice It

Sit or lie down comfortably. You can do this anywhere, including at your desk or in a parked car. No special posture is needed.

1. Inhale slowly through your nose until your lungs feel comfortably full.
2. Take a second, shorter inhale on top of the first. This is the double-breath that defines the technique. Don’t force it. A small top-up is enough.
3. Exhale slowly and completely through your mouth. Make the exhale longer than the combined inhale. Let it finish naturally.
4. Repeat for five minutes.

Five minutes is the dose used in the Stanford study. Shorter sessions still help, but the benefits are cumulative and most pronounced with sustained practice.

When to Use It

Cyclic sighing is especially useful when you notice anxiety building but haven’t reached full panic. The double inhale is easier to execute than techniques that require slow, controlled breathing, which can feel impossible when you’re already hyperventilating. It’s also a good technique for the transition out of a stressful day, before sleep, or in the minutes before a meeting or difficult conversation.

Resonant Breathing: Training Your Nervous System Over Time

If cyclic sighing is an in-the-moment reset, resonant breathing is a long-term training practice. Sometimes called coherent breathing, the technique involves breathing at a slow, steady pace of about 5.5 breaths per minute (roughly 5.5 seconds inhaling, 5.5 seconds exhaling).

That specific pace is not arbitrary. It’s the rate at which the cardiovascular and respiratory systems enter a resonance state with the body’s blood-pressure regulation system (the baroreflex). When you breathe at this rate for a few minutes, heart rate variability (HRV) increases substantially. HRV is a measurable indicator of vagal tone and autonomic flexibility. Higher HRV is associated with better stress resilience, better cardiovascular health, and lower anxiety.

Why It Works

Most breathing techniques slow your breath somewhat. Resonant breathing slows it to a very specific pace that synchronizes with the body’s own rhythms. This synchronization produces a cascade of effects: the vagus nerve activates more strongly, parasympathetic tone rises, sympathetic arousal falls, and the body shifts into a state that’s physically measurable on an electrocardiogram.

The research base here is substantial. Richard Gevirtz at Alliant International University and others have published dozens of studies using HRV biofeedback, which essentially teaches resonant breathing using real-time heart-rate feedback. Benefits have been documented across conditions including generalized anxiety, PTSD, depression, irritable bowel syndrome, hypertension, and chronic pain. Effect sizes in these studies are meaningful, and the physiological mechanism is specific and measurable. This isn’t a placebo effect.

How to Practice It

Find a comfortable seated position. You don’t need to lie down, though you can.

1. Breathe in slowly through your nose for about 5.5 seconds.
2. Breathe out slowly through your nose or mouth for about 5.5 seconds.
3. Do not pause between inhale and exhale. The breathing should be smooth and continuous, like a wave.
4. Continue for 10 to 20 minutes.

Counting 5.5 seconds is awkward. Most people use one of two approaches. You can use an app or a video that provides an audible or visual pacer (search “coherent breathing app” or “5.5 bpm breath pacer”). Or you can count to six on the inhale and six on the exhale, which is close enough to produce the same effect for most people.

When to Use It

Resonant breathing works best as a daily practice. The benefits are not primarily about the minutes you spend doing it. They’re about the way sustained practice gradually shifts your baseline nervous system function. People who practice 10 to 20 minutes daily for several weeks often report less reactivity, better sleep, and a general sense of more space between stimulus and response.

It’s less useful for acute panic than cyclic sighing, because the slow pace requires a level of baseline calm that’s hard to reach when you’re already activated. Think of resonant breathing as training, and cyclic sighing as the rescue technique you reach for when training hasn’t kept up with the moment.

A Note on Nasal Breathing

Both techniques above involve nasal breathing during the inhale, and this is worth mentioning on its own. A growing body of research suggests that chronic mouth breathing contributes to a range of problems including sleep-disordered breathing, increased anxiety, and dysregulated CO2 tolerance. Many people who struggle with anxiety are also chronic over-breathers and mouth breathers without realizing it.

The work of physician Konstantin Buteyko in the mid-20th century, and more recently writers like James Nestor (Breath, 2020), has drawn attention to the role of nasal breathing and CO2 tolerance in nervous system regulation. The full Buteyko method is taught over multiple sessions with certified practitioners and is beyond the scope of a blog post. But the general principle is worth being aware of: breathe through your nose, don’t over-breathe, and build tolerance to slightly elevated CO2.

If you notice that you habitually breathe through your mouth, especially at rest or while sleeping, that’s worth raising with your doctor or a qualified breathing practitioner.

When to Seek Additional Support

Breathing techniques are powerful, but they’re not a substitute for addressing what’s driving your anxiety in the first place. If you find that anxiety is interfering with your sleep, your relationships, your work, or your daily functioning, a breathing practice alone isn’t likely to be enough. It’s one tool in a larger toolkit that includes understanding what your anxiety is trying to tell you, adjusting the patterns that keep it activated, and sometimes working with a professional who can help you do that work.

If you’d like to talk about what’s going on for you, schedule a consultation. We offer virtual sessions across Texas.

Learn more about Anxiety Counseling in Austin or Stress Management Counseling.