Lactate Threshold
Sport Science
Lactate threshold is the exercise intensity at which blood lactate begins to accumulate faster than the body can clear it. Below the threshold, lactate production and clearance are balanced and exercise can be sustained for extended periods. Above it, lactate accumulates, hydrogen ions increase, and performance deteriorates. Lactate threshold — often expressed as a percentage of VO2 max or heart rate — is one of the most important determinants of endurance performance and is more trainable than VO2 max itself.
What Coaches Should Know
Lactate threshold training — sustained work at or slightly below the threshold intensity — is the primary driver of endurance adaptation in trained athletes. Tempo runs, threshold intervals, and zone 3–4 cardiac output work all target this quality. For team sport athletes, a well-developed lactate threshold means they can sustain higher intensities across a game without accumulating fatigue as rapidly.
Practically, threshold intensity corresponds to a pace sustainable for roughly 40–60 minutes at high effort — comfortably hard but not a sprint. Heart rate zones can estimate it, though the accuracy varies by individual. Lactate testing with a blood analyzer is the gold standard. For most team sport programs, pacing guidelines and RPE-based prescription are sufficient without lab testing.
Also related to: VO2 Max, Anaerobic Threshold, GPP, Periodization, HRV