Lactate Threshold Curve

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Lactate step test · cycling

M. Reinholt · 68 kg · 12 Mar 2026 · 4 min steps · 20 W increments · fingertip draw at each stage end

11 steps · 120 W to 320 W · peak 9.9 mmol/L · LT1 234 W · LT2 291 W

blood lactate · mmol/L
heart rate · bpm
Aerobic · below 234 W · 6 steps
Threshold · 234–291 W · 3 steps
Anaerobic · above 291 W · 2 steps

LT1 · aerobic: 234 W · 1.2 mmol/L · 165 bpm
LT2 · anaerobic: 291 W · 4.0 mmol/L · 182 bpm

Each dot is one stage of the test — the intensity held, and the lactate drawn at the end of it. The line between two dots is a monotone interpolation, so it never invents a dip the athlete did not produce, and it stops at the last stage rather than extrapolating. LT1 is where lactate first lifts off the resting baseline and LT2 the highest intensity it can still be cleared at; the bands between them are derived from those two numbers alone. The heart-rate line has its own axis on the right, so where the two lines cross means nothing — only their shapes do. Point at the curve, or tab in and use the arrow keys, to read any stage.

Lactate step test · cycling — one row per measured stage. LT1 at 234 W, 1.2 mmol/L. LT2 at 291 W, 4.0 mmol/L.
Intensity	Lactate	Heart rate	Zone
120 W	0.8 mmol/L	106 bpm	Aerobic
140 W	0.8 mmol/L	123 bpm	Aerobic
160 W	0.8 mmol/L	not recorded	Aerobic
180 W	0.8 mmol/L	142 bpm	Aerobic
200 W	1.0 mmol/L	153 bpm	Aerobic
220 W	1.2 mmol/L	164 bpm	Aerobic
240 W	1.3 mmol/L	166 bpm	Threshold
260 W	1.9 mmol/L	177 bpm	Threshold
280 W	3.0 mmol/L	180 bpm	Threshold
300 W	5.2 mmol/L	184 bpm	Anaerobic
320 W	9.9 mmol/L	187 bpm	Anaerobic

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Lactate step test · cycling

M. Reinholt · 68 kg · 12 Mar 2026 · 4 min steps · 20 W increments · fingertip draw at each stage end

Blood lactate against intensity, with the aerobic and anaerobic thresholds marked

No step test to draw yet

A lactate curve needs at least two stages, each with the intensity held and the lactate drawn at the end of it. A single threshold number cannot be unrolled back into the shape of the response.

Lactate step test · cycling

M. Reinholt · 68 kg · 12 Mar 2026 · 4 min steps · 20 W increments · fingertip draw at each stage end

Blood lactate against intensity, with the aerobic and anaerobic thresholds marked

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Lactate step test · cycling

M. Reinholt · 68 kg · 12 Mar 2026 · 4 min steps · 20 W increments · fingertip draw at each stage end

Blood lactate against intensity, with the aerobic and anaerobic thresholds marked

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