Practical comfort with rising respiratory drive and mild air hunger during controlled breathing.
In breathwork, CO₂ tolerance describes how calmly someone can stay with rising urge-to-breathe signals while keeping the breath controlled and voluntary. Auralize uses a controlled-exhale assessment as its default product baseline for this training target.
See also
Learn · Science
CO₂ Tolerance: Why Breath Control Matters
CO₂ tolerance trains the buffer between breath urgency and reactive breathing, so stress spikes, breath pauses, long exhales, and athletic pacing are easier to stay coordinated through.
Learn · Assessments
The Auralize CO₂ Tolerance Test
Auralize measures one slow, controlled exhale after a guided warm-up. It is a proprietary respiratory-control baseline—not a blood-gas test or a BOLT breath hold.
Glossary · Sensation
Air hunger
The subjective feeling of needing to breathe, driven primarily by CO₂ chemoreceptor activation.
Glossary · Physiology
Chemoreceptors
Sensors that monitor blood chemistry to regulate breathing. Central chemoreceptors watch CO₂ and pH; peripheral ones watch oxygen.