Breathwork: The Evidence-Based Knowledge

Key Takeaways

Volume 1 — Fundamentals and practice

• Nasal breathing as the default: Filters, humidifies and warms the air, and contributes to local nitric oxide production.
• Slow breathing: About six breaths per minute is well studied and may influence autonomic regulation.
• Extended exhale: The simplest, lowest-threshold technique — calming and generally well tolerated.
• Sleep apnea: Belongs in medical diagnostics, not in self-treatment with mouth tape.
• Important rule: Techniques involving hyperventilation should never be practiced in or near water — the resulting loss of consciousness can lead to drowning.

Volume 2 — When breathing becomes a training stimulus

• Respiratory muscle strength is trainable: Strength gains through targeted training are well documented — the transfer to overall athletic performance, however, is inconsistent.
• Strain breathing is a tool, not an automatism: The Valsalva maneuver can increase trunk stability, but comes with brief blood pressure spikes.
• Hypocapnia is not hypoxia: Too much breathing and too little oxygen are two different mechanisms with different risks — confusing them is dangerous.
• Relieving symptoms is not treating: Breathing therapy can complement treatment for asthma, COPD and long COVID, but doesn’t replace medical care.
• Many popular promises don’t hold up: From “boosting the immune system” to “extending lifespan” — the current evidence doesn’t support these claims in their widely circulated form.