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Long-term, regular exercise fitness increases maximum possible value of heart stroke volume (SLD). This increases diastole, ie time of complete relaxation of the heart, and it an opportunity to rest a little longer. In the transition from dormancy to SLD load increases rapidly and reaches a stable level during the intense rhythmic work duration of 5-10 min. The maximum value of SLD observed for heart rate 130 beats / min. In the future, with increasing load the rate of increase in stroke volume of blood decreases sharply. Prolonged and increasing loads of stroke volume has not increased. Maintenance required level of circulation provided greater heart rate. Cardiac emissions increase is mainly due to more complete emptying ventriclesie, by use of the contingency of blood volume (Dubrovsky VISmirnov VM 2002).

Also during the fitness workout is variation in minute volume of the heart (ISO)injected into the system circulation. ISO can vary widely: from 4-5 l / min.at rest to 25-30 l / min. with heavy physical exertion.

MOC determined stroke volume (SLD) and heart rate (HR), depends on the situation of the human body, its sex, age, fitness, conditions of the environment and many other factors. During physical activity of medium intensity in the sitting position and standing MOC approximately 2 l / min. less than when performing the same load in position lying. This is due to an accumulation of blood in the vessels of the lower extremities due force of attraction. In the process of training ISO gradually increases to stable level, which depends on the intensity of the load and provides necessary level of oxygen consumption. After training, ISO gradually decreases. It should be noted that in light physical activities increase ISO is due to an increase in heart stroke volume and heart rate.In severe physical exertion, it is provided primarily by increasing heart rate (Dubrovsky VI, Smirnov VM 2002).

Thus, with increasing levels of fitness need infarction oxygen decreases as at rest and during submaximal loads, which indicates an economization of cardiac activity and Increased reserve capacity of the circulatory apparatus in muscle activities. One of the most important effects of this - curtailment of heart rate at rest (bradycardia). Extension phase of diastole (Relax) provides more beds and better supply of heart muscle oxygen (Amos NM, Bendet JA 1984). It is estimated that a person in a state of relative quiescence, in Sports atrial per night goes 16 hours, ventricular-12 and the heart-4 hours. Consequently, for 60 lots of life on the rest account for 20 years, it refers to the untrained heart with a frequency of 70-72 reduction in stroke minute. The one who is regularly involved in fitness, it is reduced to 45-40 times per minute, and the win for the rest get a huge (Rogozhin, MF 1999).

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