1, practicing a muscle is inseparable from high-intensity training, and it is precisely high-intensity training that has a certain impact on growth. Remember the gymnasts in the gym? They are all agile, amazing and perfect. Gymnastics champions standing on the podium are often giants in people's hearts! And their real height is really a little low in the eyes of ordinary people ... for example, Chen only has 158cm.

2. In fact, improper exercise or excessive exercise will reduce the growth hormone and other endocrine hormones of the human body, which will have a negative impact on the development of height. The training of the gymnastics team is very hard. The premature and excessive strength training of the children in the team is harmful to the development of bones and joints, especially to the epiphysis of joints, thus inhibiting growth.

3. Medical research shows that in the process of human growth and development, the growth of height precedes the growth of weight. Children usually grow taller first and then grow bigger.

According to the measurement, when a boy is 8 years old, the muscle weight accounts for about 27% of his body weight, and it can only increase to 45% in adulthood. Because children's muscles contain more water, less protein and inorganic salts, their strength is weak and they are prone to fatigue. Therefore, it is not advisable to carry out muscle weight-bearing strength exercises too early in childhood.

4. Premature and excessive weight-bearing training will hinder height growth.

Overload leads to the increase of cardiac ejection resistance, which tends to thicken the ventricular wall prematurely and limit the development of ventricular cavity. It affects the normal development of the lower limbs, causes the deformation of the legs and the decline of the arch of the feet (forming flat feet), and also accelerates the premature completion of the ossification of the lower limbs, which ultimately hinders the growth of height.

Speaking of the relationship between weight and height, I have to mention a problem that many parents ignore, that is, children carrying overweight schoolbags will deform their spine and damage their muscles.

Overweight backpacks can cause the spine to be backward, sideways, forward or twisted. At the same time, muscles may be tired due to extreme tension, and the neck, shoulders and back are easily injured. This is why there is a "small hunchback". It is suggested that the backpack weight should be controlled below 10% of the backpacker's weight.

Extended data

The benefits of fitness

1, long-distance running can improve the function of respiratory system and cardiovascular system. Scientific practice has proved that long-term rhythmic deep breathing can make people inhale a lot of oxygen. If the oxygen intake exceeds 7-8 times of usual, it can inhibit the growth and reproduction of human cancer cells.

Secondly, long-distance running also improves the oxygen supply state of myocardium, accelerates myocardial metabolism, thickens myocardial fibers and enhances myocardial contractility, thus improving the working ability of the heart.

2, fitness long-distance running is conducive to disease prevention. Fitness long-distance running accelerates blood circulation and cleans up harmful substances in the excretory system, making it difficult for harmful substances to stay and spread in the body. According to the determination,/kloc-running 3000m in 0/6 minutes or 5000m in 25 minutes can reduce blood cholesterol. This has a good preventive effect on the elderly who are prone to different degrees of hyperlipidemia, which in turn leads to arteriosclerosis, coronary heart disease and cerebrovascular disease.

3, fitness long-distance running is conducive to a comfortable mood and a happy spirit. Because this kind of long-distance running does not pay attention to the outcome of the competition, it only seeks to exercise in a relaxed and happy way, so it is very conducive to alleviating the mental and psychological tension brought about by high-tempo and high-intensity sports in modern society.

According to medical experts, this kind of relaxed and pleasant exercise can best promote the release of endorphin bark, a polypeptide substance in the body, thus causing lasting euphoria and sedation. In addition, because long-distance running makes people full of optimism, it helps to increase appetite, strengthen digestive function and promote nutrient absorption.

Long-distance running exercise plays a very good role in cultivating people's tenacious will to overcome difficulties and temper hard work. Especially for those who are afraid of the cold in winter, love to sleep late and don't want to exercise, let people taste the benefits of long-distance fitness exercise.

4. Healthy long-distance running needs to pay attention to speed, try to keep it at a speed that your body can adapt to, and avoid too intense long-distance running, especially if you don't run often. Your hands and feet may be sore for the first time the next day because of lactic acid produced by strenuous exercise.

Baidu Encyclopedia: The Benefits of Fitness