User warning about device usage

Warning for the user regarding the use of the device

Thank you for placing your trust in our technology, the result of over 15 years of research and development in sweat measurement and its relationship to athletic performance. Before purchasing the device, please review the following information carefully to ensure an optimal experience and avoid potential issues.

Insufficient Sweating

We have found that approximately 3 % of individuals produce so little sweat—even under maximal exertion—that the sensor cannot collect a sufficient sample to deliver a reliable lactate reading. If you suspect you fall into this category (for example, if your skin remains almost dry even during very intense exercise), this device may not be suitable for you and we cannot guarantee valid measurements.

Excessive or High-Density Sweating

Around 8 % of users secrete sweat of such high density that it cannot penetrate the sensor’s micromembranes properly. This can lead to erratic readings or slower response times. In these cases, our quality protocol provides for immediate return of the device and a full refund, so you can choose a more appropriate alternative at no extra cost.

Proper Placement of the Device

More than 12 % of users experience invalid readings because the sensor was not applied correctly—whether due to inadequate skin cleaning, incorrect positioning, or improper tension in the adhesive. We strongly recommend watching the instructional video before first use, where we demonstrate step by step how to prepare the skin, position the sensor (typically beneath the lower edge of the left scapula, avoiding hair or lotions), and secure the device with just enough pressure to stay in place without blocking natural perspiration.

Lactate Curve by Training Level

Scientific literature provides average reference curves for blood lactate concentration as a function of running speed and training status (sedentary, amateur runner, professional). The accompanying chart illustrates the speed at which each group reaches the lactate threshold (≈ 4 mmol/L): lowest and earliest for sedentary individuals, progressively later and higher for amateur and then professional athletes. These averages are a useful guideline but do not replace your own personalized curve.

Importance of Incremental Tests

Although reference averages can guide you, every athlete is unique. We have observed that 24 % of users skip the two incremental tests recommended in the first sessions. These protocols require you to increase speed or workload in controlled steps—hold each step for 3–5 minutes—then repeat on a separate day under similar conditions. Only by completing both tests can the device calibrate your personalized lactate curve accurately, define your training zones, and track your true progress.

Please remember to review the instructions and video before each use, stay well hydrated, and avoid applying creams or oils to the measurement area. Perform the incremental tests on different days, noting environmental and nutritional conditions. If you have any questions about interpreting your data, consult your coach or a qualified health professional. By following these guidelines, you will maximize data reliability and safely enhance your training.