Gentle and Intensive Breathwork Compared: Aims, Evidence and Risk

Safety first

This page separates two very different groups of practice. It teaches neither intensive style. If you have trouble breathing, chest pain, fainting, or rapid breathing for the first time, get urgent care (in the US, call 911). MedlinePlus says first-time rapid breathing may be a medical emergency. [1] For a mental-health crisis in the US, call or text 988. Never do overbreathing or breath-holding practices while driving, bathing, swimming, in or near water, or at heights. Sit or lie down for any breathing practice, never force it, and stop and return to normal breathing if you feel dizzy, tingly, faint, anxious or short of breath.

The short answer

Gentle and intensive breathwork differ in aim, evidence and risk. Gentle practices aim to settle the body with slow, comfortable breathing. Intensive practices change breathing on purpose to produce strong body or mind effects, often with fast or deep breathing, breath retention, or both. We do not rank them by "power". We compare how much is known and what can go wrong.

Side by side

Evidence for gentle practices

Reviews are encouraging but modest. A review of 12 trials found lower stress (g = -0.35), mostly at moderate risk of bias. [7] A review of 223 studies found higher vagally mediated heart rate variability with voluntary slow breathing, and suggested these exercises as low-tech adjuncts with few adverse effects expected. [4] A review of 73 trials in serious lung disease found no adverse events related to breathing techniques. [8] These show short-term changes, mostly self-reported, from trials that cannot hide the practice from participants. Gentle breathing is an adjunct, not a replacement for medical or mental-health care.

Evidence for intensive practices

A review of high ventilation breathwork says it is associated with extraordinary changes in subjective experience and with effects on the central and autonomic nervous systems, and that putative benefits for trauma-related, affective and somatic disorders invite further research. [3] That is a call for study, not proof. One of its authors trained as a breath teacher. [3] In a small trial of cyclic hyperventilation, breath retention and cold exposure, healthy volunteers had higher epinephrine and lower inflammatory markers after a toxin challenge. [9] For holotropic breathwork, a Danish study of 20 people found changes in self-awareness and an increase in paranoid ideation scores. [10] Proper evidence not found for large randomized safety trials of intensive breathwork; we searched PubMed for holotropic and high-ventilation breathwork and found only the small studies and reviews cited here.

Documented risks

Overbreathing can cause dizziness, tingling and weakness. [1] A pulmonologist quoted in a magazine said prolonged overbreathing can contribute to seizures and that few proper studies exist because of dangers and ethics. [5] Hypoxic blackout describes a loss of consciousness during an underwater submersion attributable to hyperventilation, extended submersion or repeated submersions. [6] A children's hospital warns that breath-holding challenges may raise the risk of fainting and drowning underwater. [11] In a review of pranayama for mental disorders, adverse events were more often linked with fast than slow breathing techniques. [12]

Who should avoid intensive styles

Anyone with asthma, COPD, heart conditions, high or low blood pressure, epilepsy, pregnancy, glaucoma, psychosis, bipolar disorder, panic disorder, an eating disorder or a trauma history should ask a clinician first and generally avoid overbreathing or breath-holding styles. The sources we read do not give a complete official list, so this is cautious general guidance. See who should not do intensive breathwork and documented injuries and deaths.

Related reading

Gentle breathing and relaxation practices, intensive breathwork and breath-holding risks.