LT1 and LT2 Threshold Determination
Enter incremental lactate test data. Power, speed, pace and heart rate input supported in any combination.
System will automatically determine available parameters and calculate thresholds with percentages from heart rate and lactate.
Incremental Test Data
| Power (W) | Speed (km/h) | Pace (MM:SS) | Lactate (mmol/L) | Heart Rate (bpm) | Actions |
|---|---|---|---|---|---|
What are Lactate Thresholds?
Lactate thresholds (LT1 and LT2) are key physiological markers that define training intensity boundaries. LT1 (aerobic threshold) indicates the transition to mixed energy supply at approximately 60-75% of maximum, where noticeable lactate accumulation in the blood begins. LT2 (anaerobic threshold) occurs at 80-90% of maximum and represents the critical intensity that can be sustained for extended periods without significant muscle acidification.
How to Use the Lactate Threshold Calculator?
Choose a calculation method based on available data: heart rate (HR), power in watts, or running speed. Enter data from your graded exercise test with gradually increasing intensity. The calculator will automatically determine your LT1 and LT2 thresholds and create personalized training zones for maximally effective workouts.
What are Lactate Thresholds Used For?
- Precise determination of personalized training zones for different training types
- Planning tempo and interval training with optimal intensity
- Objective assessment of aerobic endurance level and fitness
- Monitoring training progress and body adaptation to loads
Frequently Asked Questions About Lactate Thresholds
What is the difference between LT1 and LT2?
LT1 (aerobic threshold) is the intensity at approximately 60-75% of maximum, where noticeable lactate accumulation in the blood begins, but the body is still able to utilize it effectively. LT2 (anaerobic threshold) occurs at 80-90% of maximum and represents the critical intensity above which lactate accumulates faster than it is utilized, leading to rapid fatigue.
How often should lactate thresholds be recalculated?
It is recommended to conduct threshold testing every 8-12 weeks of training or after significant changes in the training process (volume changes, intensity, training breaks). This will help update training zones and track progress.
Can the calculator be used for cycling and running?
Yes, the calculator is universal and supports lactate threshold calculation by power in watts (for cycling and triathlon), speed in km/h or pace in min/km (for running), as well as heart rate (for any sport). Choose the appropriate method depending on your activity type.