Lactate threshold

乳酸阈值

Place · Level 3

乳酸产得比清得快的那个拐点 · 乳酸是燃料不是废物 · 阈值能靠训练往后推, 真的涨耐力

Connected to · 2

regulates · 1

Zone 2 training
The threshold splits intensity distribution in two: volume below it drives mitochondrial adaptation, while too much time in the grey zone around it serves neither end — not easy enough to accumulate, not hard enough to raise the ceiling.

contrast · 1

DOMS soreness
Lactate is cleared and reused within about an hour of stopping, while delayed-onset soreness arrives a day or two later — the timing does not line up. Lactate is not a fatigue waste product either; the heart, other muscles and the liver take it back and burn it.

Lactate is fuel

Stop 1/6

乳酸是燃料, 不是废物

The pre-1980s model equated lactate with hypoxia + fatigue + waste. That model was falsified 40 years ago, but it still circulates in gym class and weight rooms.

Brooks 1986 lactate shuttle theory (Cell Metabolism 2018 review):

Fast-twitch fibers (type II) rely on glycolysis during training, producing large amounts of lactateLactate enters the blood, where the heart, slow-twitch fibers, brain, and liver actively take it upThese tissues use lactate as an energy substrate preferred over glucose (the heart gets ~60% of its vigorous-exercise energy from lactate)Lactate is also the raw material for hepatic gluconeogenesis, forming the Cori cycle
So rising blood lactate during training isn't a disaster — it's a sign of normal aerobic + anaerobic system teamwork. The training goal isn't 'producing no lactate' but improving lactate clearance capacity and raising the threshold.

Read story Open mechanism

Educational content, not medical advice — consult a clinician.

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Lactate threshold

乳酸阈值

Place · Level 3

乳酸产得比清得快的那个拐点 · 乳酸是燃料不是废物 · 阈值能靠训练往后推, 真的涨耐力

Connected to · 2

regulates · 1

Zone 2 training
The threshold splits intensity distribution in two: volume below it drives mitochondrial adaptation, while too much time in the grey zone around it serves neither end — not easy enough to accumulate, not hard enough to raise the ceiling.

contrast · 1

DOMS soreness
Lactate is cleared and reused within about an hour of stopping, while delayed-onset soreness arrives a day or two later — the timing does not line up. Lactate is not a fatigue waste product either; the heart, other muscles and the liver take it back and burn it.

Lactate is fuel

Stop 1/6

乳酸是燃料, 不是废物

The pre-1980s model equated lactate with hypoxia + fatigue + waste. That model was falsified 40 years ago, but it still circulates in gym class and weight rooms.

Brooks 1986 lactate shuttle theory (Cell Metabolism 2018 review):

Fast-twitch fibers (type II) rely on glycolysis during training, producing large amounts of lactateLactate enters the blood, where the heart, slow-twitch fibers, brain, and liver actively take it upThese tissues use lactate as an energy substrate preferred over glucose (the heart gets ~60% of its vigorous-exercise energy from lactate)Lactate is also the raw material for hepatic gluconeogenesis, forming the Cori cycle
So rising blood lactate during training isn't a disaster — it's a sign of normal aerobic + anaerobic system teamwork. The training goal isn't 'producing no lactate' but improving lactate clearance capacity and raising the threshold.

Read story Open mechanism

Educational content, not medical advice — consult a clinician.