Effect of coherent breathing on stress and mental health

A simple double inhale and long exhale can drop your stress in seconds, and a Stanford-led trial backs it.

Story Snapshot

Dr. Andrew Huberman highlights a “physiological sigh” to calm the body fast.
A Stanford study found exhale-heavy “cyclic sighing” improved mood and lowered arousal.
Five minutes a day beat mindfulness on several measures in that trial.
One or two deliberate sighs can help in the moment, then you can scale as needed.

What Huberman Teaches: The Physiological Sigh, Step by Step

Dr. Andrew Huberman describes a brief breathing pattern you can use anytime. Take two quick inhales through the nose, back-to-back, with no exhale in between. Then breathe out slowly through the mouth until empty. That second, smaller inhale helps inflate tiny air sacs in the lungs. The long exhale signals the body to slow down. Huberman’s newsletter sets a crisp protocol and notes you can deploy a single sigh on demand, or run repeated cycles when stress is high.

Neuroscientists call this a fast lever on the autonomic nervous system. The long exhale tilts the body toward the “rest and digest” branch. People use it before public talks, hard meetings, or tense calls. You can do it in a car, at your desk, or before bed. Many find one to three sighs calm a racing mind. When you have more time, five minutes of the same exhale-heavy breathing extends the effect and sets a steadier baseline for the day.

The Stanford Trial: Brief Breathwork Versus Mindfulness

Stanford-affiliated researchers ran a one-month randomized controlled trial that compared daily five-minute sessions of breathwork against mindfulness. The breathwork group included exhale-focused “cyclic sighing.” Participants who did the cyclic sighing showed larger gains in mood and bigger drops in respiratory rate than those who did mindfulness for the same time. The authors reported breathwork, especially the sighing protocol, outperformed mindfulness on several endpoints tied to arousal and well-being.

The Stanford Medicine news write-up summarized the key results in plain terms. All groups improved, but the exhale-heavy approach led the pack. The team tracked mood and physiological markers, including breathing rate, across the month. The design was remote and used daily five-minute blocks, which fits busy lives. The small lift from a short, easy habit can compound when done daily. That is why the format matters: brief, repeatable, and coachable at scale.

Why Exhales Win: Mechanics That Settle the System

Longer exhales cue a drop in heart and breathing rates. This change recruits pathways that favor calm. Reviews of sighing and deep breathing show that these patterns reset breathing variability and support lung function. They also track with shifts in arousal and relief. This lines up with the day-to-day feel of the practice: a few slow exhales reduce tension and help clear mental noise. The “double inhale, long exhale” adds a mechanical boost by re-inflating lung tissue before the release.

People who want numbers beyond one trial can look to the broader breathwork literature. Meta-analyses report small to medium reductions in reported stress after breathwork programs. Not every study finds the same effect size or method advantage, but the trend favors slow, guided, exhale-biased techniques. That pattern supports the claim that short, structured breathing helps most people feel and function better under strain, without gear, training time, or cost barriers.

How to Use It Today: Fast Tactics and Smart Limits

Use the physiological sigh on the spot. Do one to three cycles when you feel your chest tighten or thoughts race. For a daily practice, set a timer for five minutes. Breathe with a short double inhale and a long, steady exhale. Keep your face and jaw loose. If you get lightheaded, pause, then resume more gently. People often report calmer evenings when they run the protocol late in the day, and steadier mornings when they do it after waking.

Keep claims within what the data supports. A single trial does not make a cure-all, and breathwork will not replace medical care. But the Stanford team’s results, plus broader evidence, justify a clear promise: this technique works fast for many, and scales well. That fits conservative common sense on health habits. Use the lowest-cost lever that gets results, build consistency, and let the routine beat complexity over time.