Because as soon as people use muscles, the blood that transports energy will concentrate on a specific exercise part, which will cause edema and thickening. However, this "swelling" phenomenon is due to the short-term reaction after strenuous physical exercise.
Solution:
1: Pay attention to the running posture.
The correct running posture should be the transition from heel to forefoot.
2. Relax after running.
Stretch and relax the calf, friction stretching.
3. Pay attention to the running time and speed.
The general aerobic exercise time is 20 to 60 minutes. Excessive aerobic exercise will cause muscle fatigue and joint wear. The speed should not be too fast, and the heart rate of aerobic exercise should be controlled within (220- age) × (60%-80%). For example, a 20-year-old person's heart rate during aerobic exercise is 120 ~ 160 beats/min. Fat will stop decomposing in anaerobic state, and will not burn outside the above heart rate range, so the exercise effect cannot be guaranteed.
4. Women should do warm-up exercises before running.
Warm-up is especially important for leg stretching before running. Preheat as much as possible and stretch in place.
Precautions for running:
1. Don't squat and rest.
If you squat down and rest immediately after fitness exercise, it will hinder the blood return of lower limbs, affect blood circulation and deepen physical fatigue. This kind of situation is more common in those activities with relatively large amount of exercise, such as long-distance running. The correct way is to do more relaxation activities after each exercise, such as walking slowly and relaxing your legs.
2. Don't take a cold bath (or swim) when sweating profusely.
When sweating after exercise, the capillaries on the body surface dilate and a large amount of heat is emitted in the body. At this time, if you encounter cold water, the capillaries will suddenly contract, which will easily reduce the body's resistance and cause diseases.
3. Don't "omit" the closing activities.
When you feel exhausted after each exercise, you should relax appropriately, such as unarmed exercise, walking and relaxing massage. It helps to eliminate muscle fatigue and restore physical strength quickly.
4. Don't be greedy for cold drinks
You will lose a lot of calories during exercise, and it is understandable that you need to replenish it urgently. However, after exercise, the human digestive system is still in a state of inhibition, and eating a lot of cold drinks is easy to cause gastrointestinal diseases such as gastrointestinal spasm, diarrhea and vomiting.