DOMS · Why You're Sore Two Days Later

延迟性酸痛 (DOMS) · 为什么练完第二天才酸

Place · Level 3 · Movement

酸痛在 24-72 小时才达峰 · 不是乳酸, 是离心微损伤的修复-炎症反应 · 酸 ≠ 练到位 · 拉伸防不了它

Connected to · 3

regulates · 1

Warm-up & cool-down
A cool-down cannot clear DOMS because soreness was never lactate: lactate returns to baseline within an hour of stopping, while soreness peaks the next day. It comes from eccentric micro-damage.

contrast · 2

Progressive overload
Soreness is not a report card: a consistently trained person can train effectively and barely feel it, while a beginner can be wrecked by an easy session. Whether training worked is read from strength and performance rising under progressive overload.
Lactate threshold
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.

The soreness timeline

Stop 1/5

酸痛的时间表

Try a new movement, or train hard after a long break, and the day itself often feels fine — yet you wake the next morning, or the one after, with stiff, aching muscles. That's delayed onset muscle soreness (DOMS).

Its timeline is regular: little pain in the first hours, a peak at 24-72 hours, then gradual easing, gone within 5-7 days (Cheung 2003). The word 'delayed' is the whole case's key clue.

That timeline alone rules out the most popular explanation. If soreness were caused by 'lactic acid build-up', it should hurt most when you're most tired and lactate is highest — yet the reality is no pain then, pain a day or two later. Something the body clears within an hour of finishing exercise cannot explain soreness that arrives two days on. The next scene formally sends the 'lactic acid' misunderstanding on its way.

Read story Open mechanism

Educational content, not medical advice — consult a clinician.

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DOMS · Why You're Sore Two Days Later

延迟性酸痛 (DOMS) · 为什么练完第二天才酸

Place · Level 3 · Movement

酸痛在 24-72 小时才达峰 · 不是乳酸, 是离心微损伤的修复-炎症反应 · 酸 ≠ 练到位 · 拉伸防不了它

Connected to · 3

regulates · 1

Warm-up & cool-down
A cool-down cannot clear DOMS because soreness was never lactate: lactate returns to baseline within an hour of stopping, while soreness peaks the next day. It comes from eccentric micro-damage.

contrast · 2

Progressive overload
Soreness is not a report card: a consistently trained person can train effectively and barely feel it, while a beginner can be wrecked by an easy session. Whether training worked is read from strength and performance rising under progressive overload.
Lactate threshold
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.

The soreness timeline

Stop 1/5

酸痛的时间表

Try a new movement, or train hard after a long break, and the day itself often feels fine — yet you wake the next morning, or the one after, with stiff, aching muscles. That's delayed onset muscle soreness (DOMS).

Its timeline is regular: little pain in the first hours, a peak at 24-72 hours, then gradual easing, gone within 5-7 days (Cheung 2003). The word 'delayed' is the whole case's key clue.

That timeline alone rules out the most popular explanation. If soreness were caused by 'lactic acid build-up', it should hurt most when you're most tired and lactate is highest — yet the reality is no pain then, pain a day or two later. Something the body clears within an hour of finishing exercise cannot explain soreness that arrives two days on. The next scene formally sends the 'lactic acid' misunderstanding on its way.

Read story Open mechanism

Educational content, not medical advice — consult a clinician.