Influence of increasing physical loadings on the rhythm parameters of cardiac contractions

Typical patterns and some individual peculiarities in the change of the rhythm parameters of cardiac contractions (CC) under the physical loading (imitation of cycling with 20 and 25 km/h) have been revealed. A shift from autonomic regulating contour to the central one under the loading increasing has been recorded. It is expressed by the rigidity of CC and by the pronounced waves of the 4th degree spanning over 30-40 heart cycles.