The article examines the role of energy mechanisms in meeting the energy needs of physical activity of different intensity and duration. In the formation of energy, energy is generated in the process of lactate, lactate and tissue respiration, skeletal muscles act as the main oxidizing substrate, as well as glycogen and blood glucose accumulated in the liver. Alactate mechanisms give only 1-2 minutes at the beginning of work. As the duration of work increases, the glycolysis process intensifies. The intensity of this process can be judged by the level of concentration of lactic acid in the blood. It was found that the concentration of lactic acid in the blood after exercise of maximum intensity was 6.20±2.50 mmol/l, and after exercise of submaximal intensity it increased to 26.50±4.7 mmol/l. At the same time, the concentration of glucose in the blood was at a maximum intensity of 6.10±0.12 mmol/l and 8.50±0.15 mmol/l after a submaximal exercise.
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