Protein is the main component of all cells.
The main physiological functions of proteins are constituted and repairing body tissues, regulating physiological functions, enhances body resistance, affecting central nervous system activities and supply heat.
(1) Metabolism of material energy in protein and motion
In three major nutrients of proteins, fat and carbohydrates, the proportion of proteins in motion is relatively small, and its oxidation provides 5% to 15% energy in motion. When the glycogen in the body is sufficient, the protein supply capacity only 5% of total thermal energy requirements; most cases the protein supply 6% to 7% energy. When sugar is exhausted, the energy provided by the amino acid can rise to 10% to 15%, and the magnitude of the rise depends on the type, intensity and duration of the movement.
According to the change in plasma amino acid in motion, scholars believe that branched amino acids (leucine, isoleucine, proline) are amino acids desired by the motion, and can be directly oxidized in motion. After the one-time stress aerobic exercise, the oxidation rate of leucine can increase several times, muscle release amino acids and ammonia increases 40% blood urea level and post-motion of urinary nitrogen, which suggest that long-term endurance motion can make the amino acid in vivo Metabolism is strengthened. Its mechanism may be due to the increase in hormone secretion of hormone in the body to adjust the metabolism in the body, and improve the enzymatic activity and energy utilization efficiency of oxidized bracket amino acids.
(2) Sports and fitness people's demand and supplements of proteins
In the early days of training, the synthetic metabolism of erythritis and red blood cell regeneration due to increased red blood cell damage, often undergoing negative nitrogen balance and even cell anemia. After a period of adaptation, the nitrogen balance improvement. Thus, in
In the early days of the large exercise, protein nutrition should be appropriately enhanced. Long-term strenuous endurance sports will enhance protein metabolism, so the amount of protein is increased; strength training can increase muscle tissue volume,
The amount of protein is added to the meal to help muscle cell repair. The intensity of the exercise load is large, and the number of training will enhance the metabolism of the protein, thereby increasing the amount of the body. The thermal shortage and glycogen storage will increase the need for protein, when the thermal energy is insufficient, the amount of protein can be increased by 10%. When the growth and development period, young children participate in sports training, it should increase protein nutrients, reaching the amount of 2 to 3 g of protein per kilogram of weight, so that the needs of growth and development can be met.
The amount of protein requirements of the sports fitness population should not only meet the requirements, but at least 1/3 of the necessary amino acid complete high-quality proteins in terms of at least 1/3.
(3) Side effects of excess supplemental amino acids and proteins
Some fitness people mistakenly believe that as long as the protein nutrition, the growth of muscle tissue is increased, but the research has shown that the amount of protein must be supplemented in the premise of incrementing load power training. Excess supplemental paper-based acid or protein can cause a series of side effects. The nitrogen-containing metabolite of the protein will increase the burden of the liver, leading to the fat production of liver and kidney, which is prone to body fatigue, and a large number of proteins can cause dehydration, deluxing and gout of the body. High protein is unfavorable to water and inorganic salts, it is possible to cause urinary system uniforms and constipation; . Therefore, although the protein is good, whether it is ordinary person or a sports fitness population, the right amount is supplemented.
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