The exercise intensity at which lactate begins to accumulate in the blood faster than it can be cleared by the body. This physiological marker represents the highest sustainable pace for extended periods and is crucial for endurance performance.
Coined in exercise physiology in the 1960s-70s from 'lactate' (the salt form of lactic acid, from Latin 'lac' meaning milk) and 'threshold' (Old English, meaning boundary or limit). The concept developed as scientists better understood anaerobic metabolism during exercise.
Your lactate threshold typically occurs around 85-90% of your maximum heart rate and can be improved more dramatically than VO2 max through training. Elite endurance athletes can sustain their lactate threshold pace for over an hour, while untrained individuals might only manage 20-30 minutes - it's often the difference between winning and losing!
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