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Mesure ventilatory threshold with ZoneX

Easier to measure, more reproducible, better predictors of performance, and simpler protocols—discover why ventilatory threshold are an alternative to lactate testing.

ZoneX offers numerous advantages over lactate testing

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Are the thresholds the same?

They are similar but not quite the same.

Lactate is a product of metabolism. It is produced in the muscles.

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Ventilation thresholds directly measure the energy system that the athlete is using.

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VT2 - a performance predictor

Ventilation thresholds are more reproducible than lactate thresholds because they are easier to measure and less dependent on external factors.

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Scientific studies by Poole & Jones (2021), Wasserman, and others show that VT2 is a predictor of performance.

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More reproductible

Les tests ventilatoires mesurent directement la respiration et les transitions métaboliques.

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Ils sont moins sensibles à des facteurs externes comme la température, le stress, la nutrition ou la méthode de prélèvement

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Simpler and easier-to-implement protocols

Lactate testing protocols (LT1/LT2):

  • Blood sampling,

  • Sensitive to nutrition, stress, and testing conditions.

  • Lactate testing is difficult to reproduce and can yield variable results depending on the operator and environment.

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Ventilation testing protocols (VT1/VT2):

  • Via respiration: non-invasive, continuous method

  • Directly linked to metabolic transitions.

  • Much higher reproducibility, validated by scientific literature.

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With ZoneX, respiratory measurement can be performed outdoors, uphill, or on a home trainer, which better reflects actual performance.​

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Special offering in 2026

Unlimited ZoneX

1788€ TTC

Includes:

The device

The software

Updates

Our customers are talking about ZoneX

Kévin Rémondière,
State-certified massage therapist and physical therapist, sports coach
The ZoneX advantage: Ease of use and precision of the device

Lionel LE STRAT
Osteopath

This new sensor promises to understand your effort better than you do

Discover his channel Tous en Selle  

Aurélien Gabriele
Athlete

ZoneX is a real revolution for anyone looking to understand their physical thresholds accurately and non-invasively.

Michael Lecuivre
Sports coach

One of the most reliable methods for defining your training zones, particularly your HR1/HR2 and HR2/HR3, in a completely personalized way.

XT Xperience training

Personal trainer

I've been a coach for many years and I've integrated PAIRFS into my testing routines for several months now. It has become the ideal tool for evaluating my athletes' ventilatory thresholds: simple to use, reliable, and perfectly suited to both field and lab environments.

 

I use it regularly with very different profiles, and the result is always the same: a clear protocol, consistent data and real comfort in working.

Honestly, it's a device I really appreciate — well-designed, precise, and above all, consistent over time.

 

In short: a high-quality product that brings real value to the monitoring of my athletes.

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