Bhastrika pranayama — "bellows breath," a vigorous yogic breathing technique — measurably reduces anxiety and changes how the brain's emotion centers work. In a randomized controlled trial using functional MRI, four weeks of Bhastrika practice significantly decreased anxiety and negative mood, and altered activity in the brain regions that process emotion: the amygdala (the brain's threat detector), the anterior cingulate, the anterior insula, and the prefrontal cortex. That's notable because it shows a breathing technique reaching beyond the heart and lungs into the neural circuitry of emotion itself.
What Bhastrika is
Bhastrika, or bellows breath, is a fast, forceful pranayama: active, powerful inhalations and exhalations that move air like a blacksmith's bellows. Unlike slow calming breathwork, it's an energizing technique that raises heart rate and sympathetic ("fight or flight") activity in the moment — it belongs to the fast family described in fast vs slow pranayama. That makes the anxiety-reducing result over time especially interesting: a style that is stimulating during practice nonetheless produced calmer emotional processing across weeks of training.
The brain-imaging trial
Most breathing research measures the heart and hormones. This study looked at the brain directly. In a randomized controlled trial, healthy young adults were assessed with functional MRI at baseline and again after four weeks of Bhastrika practice, using both an emotion-processing task and resting-state scans.
The results showed up on two levels. Psychologically, the practice significantly reduced anxiety and negative affect. Neurologically, it modulated activity in the brain's emotion-processing hubs — most notably the amygdala (which drives fear and threat responses), along with the anterior cingulate cortex, anterior insula, and prefrontal cortex, regions that together govern how you perceive, regulate, and respond to emotion.
It was one small trial in healthy volunteers, so treat it as an encouraging signal rather than a settled clinical result.
Why this matters
The amygdala is central to the anxiety response — when it's overactive, the world feels more threatening. The insula tracks internal bodily states; the anterior cingulate and prefrontal cortex help regulate and interpret emotion. Showing that a breathing practice modulates these regions offers a plausible mechanism for why breathwork eases anxiety: not just relaxation, but a change in how the emotional brain responds.
It also fits a broader pattern. Slow pranayama calms through the vagus nerve and baroreflex; humming breath stimulates the vagus mechanically; and here, Bhastrika appears to reshape emotional brain activity over weeks. Different techniques, different routes — converging on a calmer nervous system. Bhastrika is also one component of Sudarshan Kriya Yoga, the most clinically studied breathing sequence.
How to practice Bhastrika safely
Because Bhastrika is vigorous, technique and caution matter:
- •Sit upright and comfortable. Never practice standing, in water, or while driving — the intensity can cause light-headedness.
- •Breathe actively through the nose — forceful, equal inhalations and exhalations from the diaphragm, like a bellows.
- •Start with short rounds — a small number of breaths, then rest and breathe normally. Build up slowly.
- •Stop if you feel dizzy or faint. Light-headedness means ease off; return to normal breathing.
- •Avoid it if you have uncontrolled high blood pressure, heart or lung conditions, or are pregnant, unless a qualified teacher and your doctor say otherwise. It is a sympathetically activating practice.
Because it's energizing, Bhastrika suits mornings or moments you want alertness — not winding down before sleep. For immediate calm, a slow technique or a physiological sigh is the better tool; Bhastrika's anxiety benefit showed up over weeks of practice, not in a single session.
See your body respond
Bhastrika drives a strong, immediate autonomic response you can watch. ONDA reads your pulse from your phone camera or Apple Watch, and your HRV from Apple Watch, so you can see how vigorous breathing lifts your heart rate during practice — the sympathetic activation the research describes — versus how slow coherent breathing settles it. Seeing both makes the difference between energizing and calming breathwork concrete.
Source: Novaes et al., 2020, Frontiers in Psychiatry — randomized controlled trial of Bhastrika pranayama with fMRI (DOI 10.3389/fpsyt.2020.00467). ONDA is not a medical device.