Individual parameters of mediated cardiac rhythm control under graduated physical activity

It has been found, that mechanisms of cardiac rhythm control tune it by corresponding acceleration of heart beats under gradually increased physical activity. Upon the decrease of physical activity the length of heart cycle of examinees becomes significantly lower than expected, which we consider as a manifestation of inertia in acceleration dominant of frequency of heart beats in the first period of physical activity. Mentioned discrepancy of theoretical and empirical cardiac rhythms in the second part of experiment is related to the relative stability of adaptive ability of cardiac rhythm control mechanisms under the gradual decrease of physical activity.