Abstract
This article assesses the dynamics of cardiointervalography indices in non-linear rats before and after a daily 12-day swimming test «until refusal». The model of physical stress in the swimming test led to a shift in the cardiointervalography indices to the prevalence of the parasympathetic nervous system function in experimental animals, which may be indicative of high functionality of a biological organism in response to regular exercise. After 12 days of physical exercise «until refusal» the electrocardiogram of rats revealed cardiac arrhythmias in the form of ectopic activity.
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