First of all, physical exercise can improve the nervous system and brain function.
The nervous system can be divided into central nervous system and peripheral nervous system. The central nervous system is composed of brain and spinal cord, and the peripheral nervous system is composed of nerve fibers emitted from brain and spinal cord. The whole nervous system is the main function regulation system of human body, and all activities of various organs and systems of human body are carried out under the control of the nervous system. Through the adjustment of the nervous system, the human body responds to the changes of the internal and external environment, so that the internal and external environment can be coordinated and unified, and the life activities of the human body can be carried out normally.
Physical exercise is a stimulus to the body from the external environment. This kind of stimulation has the characteristics of continuity, coordination, speed and intensity, which makes the body in motion. In this state, the central nervous system will mobilize all organs and systems at any time to coordinate and cooperate with the work of the body. Regular physical exercise can improve nerve activity accordingly. In addition, physical training also requires quick and accurate movements; And fast and accurate movements should be completed under the command of the brain. The brain is an advanced part of the central nervous system. In physical training, the brain, spinal cord and peripheral nerves should establish fast and accurate reactions, and the brain should correct wrong movements at any time and store information of fine movements. After repeated stimulation, people's understanding ability, thinking ability and memory ability have been improved, thus making the brain smarter. Therefore, regular physical exercise can strengthen the function of the nervous system and the working ability of the brain, making it healthier and smarter.
Second, physical exercise can improve the function of cardiovascular system.
The cardiovascular system consists of the heart and various blood vessels, which are powered by the heart. Closed piping system, also known as blood circulation system. Physical training is mainly completed by the sports system, that is, the movement of bones and muscles. The exercise system consumes a lot of oxygen and nutrients (and discharges a lot of waste) when it works. At the same time, it constantly supplements and supplies a lot of fresh oxygen and nutrients, and at the same time discharges a lot of waste. This arduous task can only be accomplished by the closed pipeline system and cardiovascular system in the body.
In a quiet state, the average heart rate is 75 beats/minute, while the output of the heart is about 50-70 ml, and the output per minute is about 4.5 liters. During strenuous muscle exercise, it can reach 5-7 times that at rest, which will inevitably make the myocardium in a state of severe contraction. Frequent stimulation will thicken myocardial fibers, atrial and ventricular walls, increase the volume of the heart and increase the dissolved blood volume, thus increasing the strength of the heart. Due to the increase of myocardial strength, the blood volume per stroke increases and the number of heartbeats decreases accordingly. In a relatively quiet state at ordinary times, the heart can get a long rest, thus reducing the workload of the heart and making it youthful.