The lactate test is next in line for an upgrade. Soon, it will be seamlessly integrated into the new Lab module, just like the load screening. In the meantime, you can continue using the legacy version of the tool.
A lactate test can be performed both on a treadmill or overground and is very similar to the load screening test, with the only difference that you record heart rate and lactate data as well as load data.
In the PRO platform, click the OnTracx Lab symbol on the left.
You’ll be redirected to the Lab environment.
Under Lactate Test, click Start test.
Enter the required personal information.
Lace up the athlete with the OnTracx sensor and connect the sensor with the OnTracx app to view real-time load data:
Option 1: Save to the athlete’s profile
Log in to the app using the athlete’s account.
The load data during the session will be saved as a regular run and automatically linked to that athlete in your Pro Dashboard.
Option 2: Save to a dedicated testing account
Log in using a testing account created for your practice.
All load data from screenings will be saved under this account and can also be linked to your Pro Dashboard.
If you don’t want to save the data:
Choose the option to use the app without an account.
Let the athlete run at different speeds (at least one minute each).
For each speed, record:
Running speed
Measured load
Heart rate
Lactate
Cadence
Click Add data point (we recommend using data from the last 10 seconds of each interval).
Click Process data
ℹ️ With our upcoming fall update, you’ll no longer need to measure real-time load through the app. Instead, you’ll be able to connect the sensor directly within the Lab module, and load data will sync automatically.
The screening report will also be automatically linked to the athlete or patient in your Pro environment — making the entire workflow seamless and efficient.
Once the lactate screening is complete, the analysis at the bottom of the page shows how the athlete’s load and how lactate and heart rate varies across speeds.
Three key thresholds are calculated:
Aerobic Threshold (LT1): The point where lactate begins to rise ~0.5 mmol/L above baseline.
Anaerobic Threshold (LT2): Determined using the Dmax method, this is where lactate starts increasing rapidly.
Load Breakpoint: The point on the load curve where the rate of increase changes, indicating a shift in running mechanics. The slope values show how much additional load is experienced per km/h as speed increases.
Load generally rises with speed, but the pattern differs per athlete: some show a steady, linear increase, while others show a breakpoint effect, where load increases more sharply after a certain speed. Identifying this speed-load breakpoint is essential: running above it may cause disproportionately high loads, while staying below it supports safer, gradual progression—especially during rehabilitation.
Using these thresholds, training zones are defined based on both physiological (lactate) and biomechanical (load) metrics. This allows you to design an optimized training plan that considers not only speed and endurance but also the mechanical load experienced by the athlete, ensuring safer and more effective progression.
You can generate a report in pdf or as raw data to integrate in your own template and share it with the athlete.