Why does playing sports make people feel tired?

Each of us has this experience, no matter what kind of sports we participate in, the human body always gradually improves from the beginning, then reaches the highest level, and maintains it for a period of time, and finally the working ability gradually decreases, the amount of work completed is significantly reduced, and more and more difficult and laborious, we must stop exercising, after a period of rest, the ability to work can return to the original level. Physiologically, the human body is called "fatigue" by a physiological process in which the human body's ability to work is reduced after a period of work and can be recovered after rest.

Fatigue does not only occur during sports, but is actually a physiological phenomenon common to all mental and physical work. Therefore, understanding the causes of fatigue is of great practical significance for preventing and eliminating fatigue. So how can we explain the causes of fatigue caused by exercise?

From a holistic point of view, it is generally believed that the muscle contraction during exercise is strong, long-lasting, complex, precise, and highly coordinated, so the cells of the cerebral cortex that control muscle activity are required to transform between excitation and inhibition processes at a high speed and maintain the ability to be excited for a long time.

In other words, they are required to work at a high level of stress; At the same time, when muscles contract, the receptors in muscles, tendons, joints, and other parts of the brain continue to send back impulses to the brain to impact the brain cells, and after a period of time, the normal relationship between the excitation and inhibition processes of the cerebral cortex changes, showing a decrease in muscle mobility. In addition, the energy consumption of muscle activity is high, and the body's demand for oxygen rises sharply. Circulation and respiration are the most important organs that draw and supply oxygen to cells from the outside world, and they are characterized by the long time it takes to reach their maximum functional potential, and there are certain limits.

Therefore, any exercise in which the human body needs oxygen more than the maximum oxygen inhalation will inevitably owe "oxygen debt", produce a large amount of lactic acid, phosphoric acid and carbon dioxide, make the blood and lymph tend to acidic reactions, and destroy the constancy of physical and chemical factors in the internal environment of cell survival. In those low-intensity, long-lasting endurance exercises, although there is no shortage of oxygen**, the total energy consumption is larger, and the main energy-supplying substances stored in the body, especially the glycogen in the liver, are depleted, or cannot be mobilized for other reasons, resulting in a significant decrease in blood glucose content. The change of physical and chemical factors in the internal environment and the reduction of energy-supplying substances in the blood not only affect the contraction of muscles, but also directly or indirectly disrupt the function of the brain and promote the development of fatigue.

There are many factors that cause fatigue in different sports and activities, but the cerebral cortex plays a leading role in the occurrence of fatigue.

Because when it comes to competition, people do their best, and they have only one goal, which is to finish first. And they will do a lot of practice preparation before participating in the sports meeting, they are constantly training all the time, and when the competition is over, their body has exceeded the load.

Participating in sports requires a lot of physical exertion and mental tension, so people feel tired.

This is because the amount of exercise is relatively large, and it takes a lot of energy, so I feel tired.

Decreased muscle exercise capacity is a basic hallmark and essential characteristic of exercise-induced fatigue.

Since the beginning of this century, researchers have conducted a large number of studies on exercise-induced fatigue from different perspectives, and proposed that the negative effects of exercise stress metabolism enhancement may be the root cause of exercise-induced fatigue, such as the depletion of metabolic substrates, the accumulation of metabolites, and the acidification of the metabolic environment.

Through a variety of channels, they may cause changes in muscle fiber structural integrity, energy**, neurohumoral regulation, etc., leading to motor muscle contraction and diastolic dysfunction. Therefore, the occurrence of fatigue is the inevitable result of the decrease in exercise capacity.

Methods of recovery from exercise-induced fatigue.

1. Rest. Rest is the most important and effective means of fatigue recovery. Only by resting well can you study well and exercise well. Rest includes sleep and active rest.

2. Sleep. Sleep is one of the best ways to get rid of fatigue. Athletes should strictly abide by the daily routine to ensure adequate sleep time, generally not less than 8 9 hours a day, and should arrange a certain amount of napping.

Sleep time can also be increased during heavy exercise load training and competitions.

3. Active rest.

Active rest refers to other activities during rest, also known as active rest. After the local muscles are tired, other muscles that are not fatigued can be used to perform some appropriate activities to promote the metabolic process of the whole body and accelerate the recovery from fatigue.

When the whole body is tired, you can also use some light, high-interest physical activities to accelerate the elimination of muscle metabolism. Therefore, we should use the method of changing the content of the activity as a means of rest in physical education class.

Exercise-induced fatigue is a normal response of the human body to exercise load, and it is a spontaneous inhibition mechanism for the body to protect itself. Exercise-induced fatigue is mainly caused by muscle and nerve fatigue and energy exhaustion. Recovery from muscle fatigue, mainly including static stretching, massage therapy and bathing and sauna; recovery from nervous fatigue, which mainly includes sleep and mental relaxation; The recovery of energy substances mainly includes the replenishment of sugar, protein, fat, vitamins, inorganic salts and water.

There are three specific mechanisms of exercise fatigue:

1. Changes in athletic ability and physical fitness lead to exercise-induced fatigue.

The exercise ability and physical fitness of the human body are closely related to the function of various organ systems of the body. Physical fitness is the comprehensive reflection of the various functional organs of the human body in muscle work. The decline in the function of various organs will inevitably affect exercise ability and physical fitness.

For example, when muscle function decreases due to long-term muscle activity, strength and speed naturally decrease, so when completing exercises, they tend to feel fatigued due to their inability to do so. In endurance exercise, if the cardiopulmonary function decreases, the ability to bear endurance loads will be reduced, and the body will be fatigued and reduce the ability to work.

2. The reduction of energy reserves in the body reduces the function of various organs in the body, leading to exercise-induced fatigue.

When the human body engages in exercise and causes fatigue, it is often accompanied by a large consumption of energy substances in the body, such as when exercising for 2-3 minutes to very tired, the phosphocreatine in the muscles can be reduced to the lowest point; During long-term continuous exercise, due to the high consumption of sugar, muscle glycogen and blood sugar both decrease. The depletion and reduction of energy reserves will lead to a decrease in the function of various organs. Coupled with the accumulation of metabolites and changes in water and salt metabolism during muscle activity, the body's working capacity will decrease and fatigue will occur.

3. Mental and volitional factors and exercise fatigue.

During exercise, the activities of various organ systems of the human body are completed under the command of the nervous system, and the reduction of nervous system function will deepen fatigue. For example, in the course of physical activity of a certain intensity and duration, chest tightness, difficulty breathing, muscle soreness and weakness, slow and uncoordinated movements, and emotional depression will occur, which is called "pole". At this point, if you continue with willpower and slowing down, it will not be long before the uncomfortable feeling disappears and the movement becomes light and powerful, and this phenomenon is called the "second breath".

This makes it possible to delay the onset of fatigue or reduce the degree of fatigue.

Preface: After exercising for a period of time, many people feel very tired, which is a very normal phenomenon. Because during exercise, a large amount of lactic acid will accumulate in the body, and these lactic acid will affect the normal metabolic function of the body.

So many people feel very tired, so you can rest for a while, and after a while, you will find that your body is back to normal. <>

There are many people who don't like sports, and sometimes sports are also whimsical. You may go out for a run or play badminton, but such a high-intensity exercise can often make people feel very tired. After exercising for a while, I feel very tired, and if I don't rest, I feel like I can't breathe.

Therefore, you can take a break at this time, and you can also come gradually when exercising, and don't force yourself. Fatigue occurs in a short period of time, and this happens to many people, so don't worry too much about it. When the lactic acid metabolism in the body is finished, you will find that the body has returned to a light state.

When exercising for the first time, be sure to do it according to your actual situation. There are many people who are exercising, and they have to choose something that is not suitable for them, but once it is carried out for a long time, it is very easy to cause damage to their body. And it's easy to hurt your knees, so you should also pay attention to rest.

If you feel very tired, you can sit down or change to a slow walk and wait until your body is well before exercising. <>

No matter what type of exercise you do, you must focus on your physical health, although it is said that everyone exercises to make themselves look better. However, if you don't pay attention to rest, then the state may get worse and worse, and it will seriously affect the night sleep. And it also causes secondary damage to the body, so everyone must learn to protect their body, try it when doing sports, step by step.

This is a normal phenomenon, after exercise, the body will produce a large amount of lactic acid, substances accumulated in the muscles, these lactic acid will affect the normal metabolism of the body, will make people feel sore, tired, even shortness of breath, irregular heartbeat.

This is normal because your body needs a period of recovery after intense exercise, and at this time we should eat more high-protein foods to replenish the body's missing energy.

This is very normal, after exercise, the body excretes a lot of sweat, does a certain amount of exercise, and consumes a lot of calories, so it is very normal for the body to feel tired.

The reason for not belonging is that the energy substance consumption is too small. The causes of exercise-induced fatigue are as follows:

1. Excessive consumption of energy substances leads to a decrease in the content of energy substances such as glycogen and ATP in the body.

2. Excessive accumulation of metabolites leads to an increase in the concentration of carbon dioxide, lactic acid and other substances in the body, which affects the pH value of the blood and the ion balance of cells.

3. The stability of the inner ring is out of balance, resulting in an increase in body temperature, a decrease in blood sugar, and a loss of water and electrosynthetic fiber desolation, which affects the function of internal organs.