An analysis of results of spiroergometry and radionuclide ventriculography in the mixed group of cardiosurgical patients allowed to reveal a reliable accretion of fraction of expulsion of the left ventricle during transition from the state of rest to work at the level of anaerobic threshold and absence of accretion of this index in further increase of exercise. The results obtained allowed to propose the use of anaerobic threshold equal to 60% of the threshold uptake of oxygen as an indicator in choosing the optimum intensity of the training exercise of patients operated on for heart diseases.
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