The value of exercise for formation of skeletal muscle
Power and the amount of the muscles are directly dependent on exercise and training. In the process, increases blood flow to the muscles, improves the regulation of their activity by the nervous system, the growth of muscle fibers, i.e., increasing the mass of muscles.
The capacity for physical work, endurance are the result of training the muscular system. Increase physical activity of children and adolescents leads to changes in the skeletal system and the intensive growth of their body. Under the influence of workout, the bones become stronger and more
resistant to stress and injury. Physical exercise and sports training, organized according to the age peculiarities of children and adolescents, contribute to the elimination of violations of posture. Skeletal muscles have an impact on the course of metabolic processes and on the implementation of the functions of internal organs. The respiratory movementsare effected by muscles of the chest and the diaphragm, and the abdominal muscles contribute to normal functioning of the abdominal organs, the circulatory and respiratory system.
Now all already know that a sedentary lifestyle – hypokinesia – harmful to health. Excess weight, developing sclerosis and related cardiovascular disorders – effects of hopkinsi. Versatile muscle activity increases the efficiency of the organism. This reduces metabolic cost to perform the work. Systematic physical stress are formed more perfect mechanism of the respiratory movements. Increased depth of breathing, increases the use of oxygen by body tissues. Under the influence of training increases lung capacity. Blood vessels in the process of training become more elastic, which improves the movement of blood. If a person is sedentary by nature of their work, not engaged in sport and physical culture, in middle and old age, the elasticity and contractility of the muscles is reduced. The muscles become flabby. As a result of weakness of the abdominal muscles is the omission of the internal organs and disrupted the function of the gastrointestinal tract. The weakness of the back muscles causes a change in posture. Slowly developing a stoop. Disturbed coordination of movements.
For our time is characterized by a wide possibility of increasing the level of physical development of man. There is no age limit for physical culture. In the elderly a systematic physical exercise prevents the deposition of salts in the joints, helps to preserve their mobility, strengthens ligaments and muscles. Thus motor skills remain at a high level, older people with age do not lose confidence in his movements. Exercises are an effective means of improvement of human motor system. They are the cornerstone of any motor skill and abilities. Under the influence of exercises formed the completeness and sustainability of all forms of motor activity. The physiological purpose of the activity is reduced to the formation of dynamic stereotypes. In the initial period of the exercise has been widespread excitement in the cerebral cortex of the brain. In the engaged state involved a large number of muscles, movement of the pupil awkward, hectic, chaotic. This reduces numerous muscle groups, often have no relation to the given motor act. It develops the braking, reduced muscle performance. As exercises widespread cortical excitation is concentrated, is formed hearth stationary excitation, concentrated in a limited group of muscles that are directly related to these exercise or physical act, why movements become more clear, free, coordinated and more economical in terms of time and energy At the final stage produces a steady stereotype, as the repetition of the exercise movements become automated, well coordinated, and they are performed only by reducing those muscle groups that are required for a given motor act.
Through systematic training achieved an increase in capacity and efficiency of the muscles of the body. This increase is achieved, on the one hand, thanks to the development of the muscles involved in this work ( worked muscles increase in volume, thus increasing their power), and also as a result of the changes that are undergoing cardiovascular and respiratory systems. Breathing in trained people alone more rare and comes to 8-10 min compared to 16-20 in untrained. The decrease in the frequency of breathing is accompanied by deep breathing, so ventilation is not reduced. During muscular work pulmonary ventilation can be up to 120 liters per minute. I trained people increased ventilation is done at the expense of deepening of breathing, whereas in untrained due to the increased frequency of respiration, which remains superficial. An in-depth breath of trained people promotes better blood oxygenation. Have trained people there is a reduction in the number of cardiac contractions, but increased systolic (drums) and minute volume of blood with a slight quickening of the heart. In untrained people minute volume increases due to increased frequency of cardiac activity with a slight increase in systolic volume.
The influence of rhythm and load on the muscles, muscle fatigue
The influence of exercise on the muscles