Body Oxygen Level Test — a subjective post-exhale, first-urge breath-hold baseline; it does not directly measure oxygen or CO₂.
BOLT is the time between a normal exhale and the first definite urge to breathe, held with the mouth closed. The result is influenced by respiratory drive, state, technique, and familiarity. Auralize uses it as a product pacing input, not a blood-gas or diagnostic measurement.
See also
Learn · Assessments
The BOLT Test: What It Measures and How to Interpret It
BOLT times a comfortable post-exhale pause to the first clear urge to breathe. It is a subjective training baseline—not a direct oxygen, CO₂, or lung-function measurement.
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 · Compare
BOLT vs CO₂ Tolerance Test: What's the Difference?
Auralize's tests use different tasks: BOLT times a post-exhale hold to first air hunger, while its CO₂ baseline times one slow controlled exhale.