Straight answers.

VO₂max is the highest rate at which your body can take up and use oxygen during hard exercise, usually given in millilitres per kilogram of body mass per minute (ml/kg/min). It is measured from the oxygen and carbon dioxide in your breath during a test that gets steadily harder. How it is calculated.

VO₂max is reported when oxygen uptake clearly levels off near the end of a test. If the test ends before that plateau, the highest value reached is called VO₂peak. VenTracer reports which one you reached.

We don't know yet, and we won't guess. VenTracer will be tested against a laboratory metabolic cart, and we'll publish the results before quoting any accuracy figure.

No. VO₂ needs both the gas concentrations and the volume of air you breathe. VenTracer pairs its dual-gas breath core with a breath flow sensor in the tube.

Your watch estimates VO₂max from heart rate, pace and a model of people like you. VenTracer measures the oxygen and carbon dioxide in your breath, along with how much air you move, and calculates VO₂ directly.

It is designed to. The analyzer corrects for air pressure, temperature and humidity on every breath. Altitude performance will be part of validation.

Not until we have shown that it agrees with one. VenTracer will be tested side by side with laboratory reference systems, and the results published before we make any accuracy claim. Read the validation plan.

No. VenTracer measures breath: airflow, oxygen and carbon dioxide. Its thresholds are ventilatory thresholds (VT1 and VT2), found from gas exchange, not from blood lactate. How the thresholds are found.

Each test will start with a room-air reference and a seal check in the app. Any further calibration steps will be defined during prototype testing.PRELIM

That's the point. The analyzer sits on the mask with no hoses or backpack, held by a five-point harness designed for a gas-tight fit at full effort.

A typical ramp test to find VO₂max and both thresholds takes about 8 to 12 minutes of hard work after a warm-up. Exact protocols will ship with the app.

The flow tube is open and designed for low resistance, and comes in sizes for rest and maximal effort. Resistance and mask dead-space figures will be published with the specifications.

Integrations haven't been announced. Pilot units export raw breath-by-breath data, and app and platform connections will be decided with pilot partners.

Anything where you can wear a mask: cycling, running, rowing, skiing, team sports and clinic treadmill or bike tests. Swimming is not supported.

No. It's a fitness and performance tool. It isn't intended to diagnose, treat, cure or prevent any disease, or to replace clinical cardiopulmonary exercise testing.

You control it. Raw breath-by-breath data will be exportable, so your coach or lab can analyse it in their own tools.

For most healthy people, yes, but it is hard work. Talk to a doctor first if you have a heart, lung or other medical condition, or are unsure whether hard exercise is safe for you.

Breath data is computed on the mask and sent to the app on your phone. Details of any cloud storage will be in the privacy notice before units ship. See the current privacy notice.

Engineering prototypes are planned for 2027, followed by validation and pilot units for coaches, labs and clinics. Pricing hasn't been announced.

Pricing hasn't been announced.

Pilot units come first. Wider availability will follow validation, and regions will be announced then.

Join the waitlist, or apply as a pilot partner if you run a lab or clinic.