Exercise needs energy. When the intensity of badminton is certain, anaerobic exercise will occur. Energy will undergo anaerobic glycolysis. During aerobic exercise, glucose metabolism produces water and carbon dioxide, which can be excreted by breathing; However, during anaerobic exercise, grape glycolysis produces a large number of intermediate metabolites, such as lactic acid, which cannot be eliminated by respiration and forms lactic acid accumulation. Too much lactic acid stimulates muscles to increase osmotic pressure, so that muscle tissue absorbs more water, resulting in local swelling, which will make muscles feel sore.

Lactic acid accumulation generally occurs in people who lack exercise, or the muscle parts lacking exercise suddenly move to a certain intensity. Start playing badminton again every once in a while, and the muscles of thighs and buttocks will be sore from the second day to the third day, because the equipment exercise of thighs and buttocks is less than other parts.

With the increase of fitness exercise frequency, the phenomenon of lactic acid accumulation after exercise will become less and less, and the degree will become lighter and lighter. So we should keep the good habit of exercising.

2, muscle fiber connective tissue injury

For people who often insist on exercising in the gym, they will often encounter muscle soreness. Why is this? In fact, the accumulation of lactic acid is only one of these people, and another main reason is the slight injury of muscle fibers.

When the muscle exercise load is gradually increased, it will cause slight damage to local muscle fibers and connective tissue, and even cause some muscle fibers to spasm. But don't be nervous, this kind of injury is acceptable and has positive muscle building significance.

After soreness, muscle tissue becomes stronger than before after local minor injuries are repaired, and the same load will not be damaged (soreness) in the future. It is worth noting that this kind of repair needs rest and protein nutrition supplement.

3. Incorrect posture leads to sports injury.

Incorrect swing posture in the process of playing badminton will lead to excessive muscle stretching and muscle pain after playing badminton. Or the intensity of a single exercise is too high, which will also lead to the same situation.