MLSS is the highest intensity at which blood lactate remains stable over a sustained effort, commonly assessed over about 20-30 minutes. It closely relates to LT2.
MLSS is measured directly with constant-load tests; LT2 is estimated from a step test. In practice, they are often close.
It marks the highest intensity you can hold for a meaningful duration without runaway lactate accumulation.
Direct MLSS testing requires several constant-load trials on different days. Step-test LT2 is the practical approximation.
Calculate MLSS yourself â free
With LactateThreshold you calculate MLSS directly from your step-test data.
Start demoThey describe a similar physiological boundary, but MLSS is measured directly while LT2 is estimated from a step test.
It is individual and cannot be determined reliably from a formula.
Combine aerobic volume below LT1 with tempo or threshold work near LT2.
It calculates LT2 as a practical MLSS approximation. Direct MLSS requires separate constant-load tests.
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