Fast breathing: breath of fire, bellows and kapalabhati

Three different practices

They get mixed up all the time, even in medical articles. The difference is which part of the breath does the work.

• Kapalabhati. Only the exhale is active: the belly snaps in, and when you release it the air comes back by itself. Here it's thirty exhales, one a second, then three slow recovery breaths. Three rounds.
• Bellows breath (bhastrika). You push on the inhale and the exhale, with equal force. Here it's twenty fast breaths, then in for 4 seconds, hold for 8, out for 6 and rest for 4. Three rounds.
• Breath of fire. Inhale and exhale are equal, light and continuous, driven from the navel. Here it's forty one-second breaths and three slow breaths. Three rounds.

Where they come from

The Hatha Yoga Pradipika, a 15th-century manual, counts bhastrika among its eight kumbhakas, or retention practices: breathe fast like a bellows, then hold the air. The same chapter brings together pranayama and hatha yoga's cleansing practices.

Breath of fire, under that name, is part of the Kundalini Yoga taught by Yogi Bhajan. The organization 3HO describes it as equal on the inhale and the exhale, with no pause, through the nose, at two to three cycles a second. The version on this site is slower.

What happens in the body

Breathing fast and deep is hyperventilating. MedlinePlus, from the U.S. National Library of Medicine, puts it this way: excessive breathing lowers the carbon dioxide in your blood, and that causes many of the symptoms. Cleveland Clinic adds the mechanism: with carbon dioxide low, blood vessels narrow, including the ones that supply your brain.

Measurements during kapalabhati back that up. In 2015, Telles and colleagues studied 47 healthy men. During the practice, oxygen consumption rose 34.6 percent, ventilation nearly tripled, and estimated carbon dioxide in the blood fell 25 to 29 percent. Nobody reported symptoms, but it's worth noting that 24 of the 71 original volunteers were left out because they couldn't perform the technique correctly.

In 2011, the same group recorded the hearts of 38 men during fifteen minutes of kapalabhati at about 60 breaths a minute. The heart rate variability measures tied to the parasympathetic brake went down. In plain terms: the body revs up. Overbreathing also adds almost no oxygen to the blood. The energized feeling doesn't come from there.

What studies found about their effects

Research is thin, and the groups are small. A 2020 trial randomly assigned 30 healthy young adults to four weeks of bhastrika or to a control group doing tabletop activities. The pranayama group reported less in-the-moment anxiety and less negative mood. Nobody was blinded, the analyses were exploratory, and the authors caution that the result can't be extended to people with anxiety disorders.

A 2023 trial of 108 adults included 33 who did, for five minutes a day, rounds of thirty breaths with a 15-second pause. They reported better mood, with no significant difference from the group that meditated. The evidence is limited, and it doesn't show that these practices help with any health problem.

The risks, plainly

The hyperventilation symptoms MedlinePlus lists are dizziness, lightheadedness, weakness, feeling unable to catch your breath, chest pain, a pounding heartbeat, tingling in the arms or around the mouth, and muscle spasms in the hands and feet. You may not even notice you're overbreathing. Cleveland Clinic notes that about half of people with panic disorder also have hyperventilation syndrome, one reason to ask first if you've had panic attacks.

The most serious risk comes from pairing fast breathing with a hold. With carbon dioxide low, the urge to breathe is delayed while oxygen keeps dropping, and it's possible to pass out. Standing up, that's a fall. In water, it's a drowning: the U.S. Centers for Disease Control and Prevention documented 16 cases in New York State, four of them fatal, tied to hyperventilating or holding the breath underwater.

One more thing. If you're breathing fast without meaning to, for the first time, or with pain, fever or bleeding, MedlinePlus says to get to an emergency room. That isn't a practice. It's a symptom.

Who shouldn't do them, and how to stay safe

• Ask a health professional first if you're pregnant, if you have a heart, lung or blood pressure condition, epilepsy, a hernia or recent abdominal surgery, or a history of fainting or panic attacks.
• Always sitting down, in a chair or on the floor. Never standing.
• Never in or near water, and never while driving.
• Stop at dizziness, tingling, blurred vision, chest pain or fear. Breathe normally and don't finish the round.
• Don't add rounds or speed on your own, and stay seated for a minute before you get up.

How to start carefully

Begin with a single round, slower and gentler than the guide calls for, and do the full recovery of slow breaths: that's the part where your carbon dioxide comes back up. Give it a few days before you add a second round.

If what you want is to wake up without this much intensity, the Wake-up breath mixes even breaths with just ten livelier ones. And on days when you have a cold, a stuffy nose, little sleep or a lot of tension, pick a slow breathing pattern instead.