There is no decisive causal relationship between muscle soreness and muscle growth and strength growth. Long-term training itself will reduce the DOMS of the body, which is a reaction to muscle soreness after exercise. After a period of training, both the pain and the actual degree of muscle injury will be alleviated to some extent. If your muscles are strong enough, not every training session will bring intense pain. Because with the improvement of training level, muscle endurance is getting better and better, and the recovery speed is getting faster and faster. Proper diet, stretching and rest can make our body recover quickly.
In fitness, we should pay attention to distinguish between the "pain" that makes people feel happy after strenuous exercise and the "pain" caused by physical injury. Muscle pain after high-intensity training is very common. This kind of pain is the result of minor injuries to muscles, ligaments and tendons, which will not cause physical harm, but it will still hurt. A certain amount of pain is essential, which is a sign of training intensity. Another common cause of soreness is the accumulation of lactic acid in muscles. When muscle activity produces lactic acid faster than the circulatory system takes it away, acid will accumulate.
Extended data:
Muscle soreness can be caused by sports, infectious diseases and other diseases. Its theory is: tissue traction: muscle injury. Muscle spasms: repeated muscle spasms. Connective tissue: Damage to the connective tissue of muscles (such as tendons). In fact, chronic muscle soreness is caused by muscle injury and division.
References:
Baidu encyclopedia-muscle pain