Acute muscle soreness

Acute muscle soreness (AMS) is the pain felt in muscles during and immediately, up to 24 hours, after strenuous physical exercise. The pain appears within a minute of contracting the muscle and it will disappear within two or three minutes or up to several hours after relaxing it.

There are two causes of acute muscle soreness:

Accumulation of chemical end products of exercise in muscle cells such as lactic acid and H⁺
Muscle fatigue (the muscle tires and cannot contract anymore)

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