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Training science

FTP vs. lactate threshold: what is the difference?

KH
Kristian Hoffmann
Founder, LactateThreshold
5 min read

FTP estimates performance from a maximal effort. Lactate threshold measures metabolic response across increasing intensity.

Why this matters

Both concepts can be useful, but they answer different questions. Lactate testing explains why a power or pace is sustainable.

What to record

For every useful lactate analysis, intensity and lactate must be linked clearly. Record pace or watts, mmol/L value, heart rate if available and the stage duration.

  • Pace or watts for each stage
  • Lactate in mmol/L
  • Optional heart rate and RPE
  • Test conditions such as heat, altitude, sleep and nutrition

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Analyze your step test for free: LT1, LT2, VLamax and 5 training zones are calculated immediately.

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How to interpret it

Look at the curve, not only at one value. LT1, LT2, VLamax and zones become more reliable when the protocol is repeatable and the curve shape is plausible.

  • FTP is a performance estimate
  • LT1 and LT2 are metabolic markers
  • FTP can drift with motivation and fatigue
  • Lactate values help calibrate power zones

Practical next step

Use the same protocol for future tests and compare trends instead of overinterpreting one isolated result.

Start lactate test analysis directly

If you already have values, go to the central analysis page or start the demo with example data.

Analyze your values PDF protocol

Why you can trust the analysis

LactateThreshold does not turn measurements into false precision. The app shows the curve, method comparison, plausible thresholds and the limits of your test protocol transparently.

Read methodologyDisclaimer
Method comparison instead of a single black-box value
Clear separation of LT1, LT2, VLamax and training zones
Limits of self-testing are stated openly
Training guidance, not a medical diagnosis

Frequently asked questions

Can I use my own lactate values?+
Yes. Enter pace or watts and lactate values from each stage. The app calculates the curve, thresholds and zones.
Do I need a lab?+
No lab is required for the software analysis if your measurements are clean. Medical diagnostics are a separate use case.
Which meters work?+
Any portable meter that reports mmol/L values can be used, including Lactate Pro 2, Lactate Plus, Lactate Scout and Lactate Express.

Compare thresholds

Start directly with the demo, no account required.

Compare thresholds

Read next

How to run your own lactate test: the complete guide

With a portable lactate meter, a consistent protocol and a clean analysis workflow, you can run a useful step test without a lab.

8 min

The 5 training zones based on lactate threshold

Lactate-based zones anchor training intensity to measured metabolism instead of generic percentage formulas.

8 min

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