Running Lactate Threshold Training: The Scientific Way to Break Through the LT Speed Wall

What is Lactate Threshold?

Lactate Threshold (LT) is one of the most important concepts in exercise physiology. When your exercise intensity exceeds a certain critical point, the rate at which your body produces lactate surpasses the rate at which it clears it, causing blood lactate concentration to rise rapidly. This turning point is the lactate threshold.

For long-distance runners, LT speed directly determines the pace at which you can sustain a marathon or half marathon. For a well-trained runner, LT speed is approximately equal to their 90-minute race pace.

Why is Lactate Threshold So Important?

Research shows that while maximal oxygen uptake (VO2max) is certainly important, lactate threshold is actually the most accurate physiological indicator for predicting long-distance running performance. Between two runners with the same VO2max, the one with the higher LT typically runs faster and longer.

How to Measure Your Lactate Threshold

Method 1: Laboratory Testing

The most accurate way is to undergo a treadmill test at an exercise physiology laboratory, where blood samples are taken every few minutes to measure lactate concentration. In Taiwan, National Taiwan Sport University and some hospitals offer this type of testing service, costing approximately NT$3,000-8,000.

Method 2: Talk Test

The intensity at which you can comfortably speak full sentences while running but cannot hum a tune is approximately around your LT. This method is simple and practical—while not highly precise, it is sufficient to guide daily training.

Method 3: 30-Minute All-Out Test

Run at the fastest pace you can sustain for 30 minutes; this pace is approximately equal to your LT speed. Simply record the average pace with your GPS watch.

Method 4: Heart Rate Method

For most runners, LT heart rate falls around 85-90% of maximum heart rate. If your maximum heart rate is 185 bpm, your LT heart rate would be approximately between 157-167 bpm.

Four Training Methods to Break Through the LT Speed Wall

1. Tempo Run

The tempo run is the most classic LT training method. Run at a pace slightly below LT (the feeling of “comfortably hard”) continuously for 20-40 minutes.

How to execute:

• Warm up with 10 minutes of easy running
• Main set: run 20-40 minutes at LT pace
• Cool down with 10 minutes of easy running
• Recommended 1-2 times per week

2. Cruise Intervals

Break the tempo run into multiple segments with short recoveries in between, with total volume equal to or even exceeding that of a continuous tempo run.

Sample workouts:

• 5 × 1 mile at LT pace, with 1 minute of easy jogging recovery between reps
• 4 × 2 km with 90 seconds of rest between reps
• 3 × 3 km with 2 minutes of rest between reps

3. Extended Tempo

For advanced runners, try running at a pace slightly below LT for 60-90 minutes. This is particularly effective for improving marathon pace.

4. AT Intervals

Run at a pace exactly equal to LT for 8-15 minutes, rest for 1-2 minutes, and repeat for 3-5 sets. This method is highly targeted and suits advanced runners who have clear LT data.

Sample 12-Week LT Training Plan

Training Considerations

Intensity control is key
The most common mistake in LT training is running too fast. A tempo run should feel “hard but manageable,” not exhausting. If you cannot complete the next day’s easy run, your intensity was too high.

Frequency recommendations
Do not perform LT training more than twice per week, and allow at least 48 hours of recovery between sessions.

Fueling strategy
Eat 2 hours before a tempo run. For sessions exceeding 45 minutes, supplement with energy gels or sports drinks.

Frequently Asked Questions

Q: Is LT training suitable for beginners?
A: It is recommended to first build an aerobic base (weekly mileage of 40 km or more) before incorporating LT training. Beginners who do high-intensity training too early are more prone to injury.

Q: How soon can I see improvement?
A: With consistent LT training, you can typically feel an improvement in pace after 6-8 weeks, with full physiological adaptation taking approximately 12-16 weeks.

Conclusion

Lactate threshold training is the most effective method for breaking through long-distance running plateaus. Through systematic tempo runs and cruise intervals, your body will gradually adapt to clearing lactate at higher speeds, allowing you to run longer distances at a faster pace. Remember: patience and consistency are the keys to successful LT training.

Related Reading

• The Science of Lactate Threshold Runs: Training Zones for LT1 and LT2
• Lactate Threshold Pace for Running: How to Find Your Fastest Sustainably Maintainable 60-Minute Pace
• Portable Lactate Analyzers: Practical Application and Training Use of Lactate Threshold Testing for Road Running
• Tempo Run: Calculating Lactate Threshold Pace and the 30-Minute Continuous Run