This study was aimed to research the special clinical test with forced respiration. The test is based on functional interrelations between breathing and blood circulation, supplying organism with oxygen. It is well-known, the forced breathing test changes the heart rate. The value of the differences can serve as mark of cardiovascular system's load-resistance and as mark of its general functional state. The test permits to define cardiovascular system's disturbances when other methods are not effective. The simplicity in implementation allows to use the method for athletes' cardiovascular system express-control in the everyday coaching work.
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