1, speed: Runners can't keep up with the rhythm of the treadmill, which is easy to hurt their knees.

2, time: too long time affects physical fitness, resulting in speed can not keep up.

3. Weight: Overweight people are advised not to use the treadmill.

4, running action: using the treadmill running action is not standardized and the knee is easily injured.

The above four factors are the most important factors that easily lead to knee injury on the treadmill, but if you pay attention to the above problems when running, running on the treadmill for a long time will not hurt your knee.

Springs are installed on the running belt of the treadmill, which can reduce the impact of friction, gravity and strength on knees and ankles during running and play a buffering role. Compared with the impact of outdoor concrete floor, it is much softer and avoids unpredictable obstacles, which reduces the possibility of injury.

Extended data:

Misunderstanding of using treadmill:

1, without preheating. Warm-up activities should be done before going on the treadmill, otherwise it will easily cause muscle strain of thighs and calves. Leg press, squat, stretching muscles, flexion and extension joints can all increase the temperature of muscles and make them softer. After getting on the treadmill, you should start with dynamic warm-up such as walking and jogging, and gradually increase the amount of exercise. This process usually takes 10~ 15 minutes.

2. The speed is set too fast. To use a treadmill, you must first understand your exercise limit. If you can't keep up with your physical strength and set your speed quickly, you will easily fall, which is a common problem for beginners.

3. excessive exercise. The time and intensity of exercise on the treadmill depends on the purpose of exercise. Jogging for more than half an hour will consume fat, and jogging for more than 1 hour will consume protein. Therefore, if the purpose is to lose weight, the exercise time should not be too short or too long, and 40 minutes is appropriate.

Running is an aerobic exercise, and the whole body will participate in it. If you have a chest bow or hold the handle all the time, you will not get the effect of exercise, but also increase the pressure on the lumbar spine, which will cause lumbar muscle strain for a long time.

References:

Treadmill _ Baidu encyclopedia