Blood Lactate Testing Guide
Everything you need to understand LT1, LT2, threshold detection methods, and how to turn your test results into smarter training zones.
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LT1 & LT2 at a Glance
- ›First point where lactate rises above baseline
- ›Typical range: 1.5–2.2 mmol/L (cycling)
- ›Upper boundary of Zone 2
- ›Fat metabolism still dominant
- ›80% of elite training volume stays below LT1
- ›Lactate accumulation accelerates sharply
- ›Typical range: 3.5–4.2 mmol/L
- ›Equivalent to FTP in cycling
- ›Maximal Lactate Steady State (MLSS)
- ›Sustainable for 45–75 minutes
Threshold Detection Methods
Fixed lactate values (2.0–4.0 mmol/L). Simple and reproducible; best for cross-athlete comparisons.
Finds the point of maximum curvature on the lactate curve. Individualised — no fixed lactate assumption.
Step with the steepest lactate rise per unit power. Captures the kinetic onset of accumulation.
Logarithmic scale reveals the aerobic threshold breakpoint. Best for LT1 in trained athletes.
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