If you exercise too much, sometimes your muscles will ache. There are two kinds of muscle soreness: one is acute muscle soreness, which appears immediately after exercise but disappears quickly; Another kind of pain does not appear immediately after exercise, but appears several hours after exercise or even after a night's sleep, and slowly disappears, taking two or three days to disappear. This kind of soreness is called delayed muscle soreness. Their reasons are not exactly the same.

Acute muscle soreness is often caused by excessive exercise and insufficient oxygen supply, which leads to a large accumulation of lactic acid in muscles. Lactic acid is an acidic substance, which can stimulate nerve endings in muscles and produce pain; In addition, the accumulation of lactic acid in muscle will cause local osmotic pressure to be too high, thus sucking up the surrounding water and causing muscle edema. This swelling stimulation is also the cause of muscle soreness. After exercise, lactic acid accumulated in muscles is gradually transported away by blood, and muscle soreness gradually disappears.

There is no unified view on the causes of delayed muscle soreness. Some people think that muscle fibers tear a little after long-term exercise; Some people think that there is some damage to the connective tissue of muscle. The above two theories have not been confirmed by many experimental materials. Because of the muscle soreness caused by this reason, you can do some stretching and stretching exercises, or do some massage or acupuncture to relieve this muscle soreness.