Lactate Threshold
The level above which pyruvate—an intermediate product of anaerobic metabolism—is produced faster than it can be used aerobically; unused pyruvate splits into lactate (lactic acid) and positively charged hydrogen ions; continued exercise above the lactate, or anaerobic, threshold results in accumulation of these ions—acidosis—causing exhaustion and intramuscular pain
anaerobic threshold (anˈ·
·rōˑ·bik threshˑ·hōld),n at increasing speeds or intensity levels, the point above which the muscles derive their energy from nonoxygenic rather than oxygenic sources during exercise. The body can only operate above this threshold for a short period of time, such as when sprinting, before lactic acid builds up in the muscles.
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