"Yesterday our unit organized a mountain climb, and now my body is sore" "I don''t exercise as soon as I see you". This is a dialogue that often occurs between two people after exercise. Why does exercise make people feel sore?

　　This is related to the amount of exercise. People who do not regularly participate in physical exercise suddenly become overloaded and their muscles are easily fatigued. This is because during exercise, the muscle tissue undergoes anaerobic metabolism to produce lactic acid. The accumulation of lactic acid in a large amount stimulates nerve endings and makes people feel sore. For those who participate in exercise for a long time, the muscle fibers are relatively strong, the tissues provide sufficient oxygen, and fatigue is not easy to occur.

　　Sports will also cause the loss of human body water and electrolytes. Generally speaking, if you lose more than 1% of water, people will feel tired. If the body loses more than 3% of water, it will lead to disordered movements, which will affect the continued exercise. The loss of electrolyte potassium and sodium can also cause fatigue and weakness.

　　In addition, exercise will increase the heart rate and increase myocardial oxygen consumption. Most treadmills in the gym have a heart rhythm display. For non-athletes, the exercise intensity reaches the heart rate for half an hour. More than 120 times/minute, 2 times per week is enough. And after exercise, the shorter the time the heart rate returns to normal, the better the heart function.

　　 In addition, it is also important to correctly grasp the timing of exercise. First, due to the high blood pressure in the morning and unstable, it is not suitable for strenuous activities; secondly, it is not appropriate to engage in sports immediately after meals, otherwise the blood will be distributed to the muscles of the limbs, which will inevitably affect the digestive function of the gastrointestinal tract; Finally, do not do vigorous exercise before going to bed, so as not to continue to excite the nervous system, leading to insomnia.

　　Dr. Konan recommends that the ideal exercise time is from 3 pm to 7 pm. As the frequency of fitness exercises increases, the phenomenon of lactic acid accumulation after exercise will become less and less, and the degree will become lighter and lighter, and the soreness will gradually reduce or disappear, so you should maintain the good habit of exercising.