Example measurement · 18/12/2025
228 W
30 min · 3.6 mmol/L
linked · 18/12/2025
Lab
Lab demo
Try calibration (MLSS, LT1 stages, field tests) and method comparison with example athletes.
4 example measurements
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Calibrations
12/01/2026CyclingLT1 stages 10 minlinked
LT1203 Wmeasured
- LT1 lies between 203 W and 213 W. The last stable stage (203 W) is used – for a more precise value, space the stages more tightly in between.
Baseline 1.0 mmol/L (measured)
| Stage | Power (W) | Lactate 5' → Lactate 10' | Rise 5'→10' (Tolerance) | above baseline | HR / RPE | |
|---|---|---|---|---|---|---|
| 1 | 193 W | 1.1 → 1.0 | -0.10 (≤ 0.36) | 0.0 | – / 10 | below LT1 |
| 2 | 203 W | 1.2 → 1.3 | +0.10 (≤ 0.38) | +0.3 | – / 11 | below LT1 |
| 3 | 213 W | 1.5 → 2.0 | +0.50 (≤ 0.42) | +1.0 | – / 12 | above LT1 |
Criterion: below LT1 lactate does not rise from 5' to 10' beyond measurement precision (at least 0.3 mmol/L; derived from the repeatability of hand-held analysers, Bonaventura et al. 2015) and stays at most 0.5 mmol/L above baseline (a fixed rise above baseline as criterion for the first lactate rise, cf. Faude et al. 2009; Jamnick et al. 2018). Between +0.5 and +1.0 the stage counts as borderline. There is no dedicated validation study for exactly this protocol; the tolerance is derived from the measurement error.
Comparison with the step test of 12/01/2026
LT1 in the step test
193 W
Difference
calibration 5.5 % higher
Which LT1 definition fits this athlete?
- Baseline + 0.5 mmol/L (Jamnick 2018)193 W · 11 W off
- Log-log breakpoint (Beaver 1985)not determinable
- Minimum lactate equivalent (Dickhuth 1999)not determinable
12/01/2026Cycling30 min all-outlinked
MLSS238 Westimate
- Range 230–243 W
- 30-min mean: 256 W
Comparison with the step test of 12/01/2026
LT2 in the step test
238 W
Difference
practically equal
LT2 in the step test already matches this value.
Example measurement · 12/01/2026
227 W
30 min · 3.8 mmol/L
linked · 12/01/2026
Check the MLSS criterion
Beneke 2003: 30-minute constant-load test; lactate may rise by at most 1.0 mmol/L between minute 10 and 30. Calculation aid only, nothing is stored.
Your MLSS-calibrated method
Modified DmaxMean error ±7.3 W (3.2%)
Based on 2 comparison pairs. Plan at least 3 linked MLSS tests for stable recommendations.
2nd place: Dickhuth IAT (±7.8 W)
Method ranking against MLSS
Ground truth (MLSS)228 W
Lactate stable at 3.6 mmol/L · 30 min duration
Modified Dmax
225 W±3 W(1.4%)Dickhuth IAT
222 W±6 W(2.7%)Log-Poly-ModDmax
236 W±8 W(3.7%)Delta +1,5
217 W±11 W(5.0%)Dmax (Original)
213 W±16 W(6.8%)Mader 4 mmol
246 W±18 W(8.1%)Ranking uses absolute deviation from the MLSS value. The best match is highlighted in green. MLSS itself has day-to-day variation of ±3–8 W (bike) or ±5–10 s/km (run); collect at least 3 comparison pairs for stable method recommendations.
Method ranking against MLSS
Ground truth (MLSS)227 W
Lactate stable at 3.8 mmol/L · 30 min duration
Dmax (Original)
230 W±3 W(1.3%)Delta +1,5
236 W±9 W(4.2%)Dickhuth IAT
236 W±9 W(4.2%)Log-Poly-ModDmax
238 W±11 W(5.0%)Modified Dmax
238 W±11 W(5.0%)Mader 4 mmol
270 W±43 W(19.1%)Ranking uses absolute deviation from the MLSS value. The best match is highlighted in green. MLSS itself has day-to-day variation of ±3–8 W (bike) or ±5–10 s/km (run); collect at least 3 comparison pairs for stable method recommendations.
Compare methods
LABHow does the calculation method affect your threshold estimate? These are six ways of analysing the same measurements.
Calculated thresholds for this test207 W – 243 W
The values depend on the calculation method. They show neither a change in your performance nor a recommended training range.
| Method | Threshold |
|---|---|
| Log-Poly-ModDmax | 228 W |
| Modified Dmax | 216 W |
| Dmax (Original) | 207 W |
| Delta +1,5 | 212 W |
| Mader 4 mmolFixed 4 mmol/L threshold | 243 W |
| Dickhuth IAT | 212 W |
Rounded to whole seconds or watts. Values displayed as equal may differ before rounding.
Which method is right for me?
This comparison cannot decide that. Additional constant-load tests can check whether an estimate matches your sustainable intensity limit (MLSS tests). Scientific background ↗
Show lactate curve with methods
Choose a method to locate its threshold on the curve. Or compare two methods directly.
Tap a measurement point. Its values stay visible below the curve. Vertical lines are calculated thresholds, not measurements.
Choose a measurement on the curve or from this list.