Abstract
Changes in the cardiac rhythm (CR) structure were analyzed from the viewpoint of nonlinear dynamics. The purpose was to evaluate the changes in the chaotic element (the correlation dimension D) of CR during a functional exercise test (the Harvard step test) in ten healthy males aged 17–18. Distinct changes in D of CR were observed during the test. Some general trends and individual differences were revealed. D always decreased in comparison with the background value at the first minutes of exercise and recovery and increased sharply at the third and/or fourth minutes of exercise. The chaotic element of CR changed together with the functional state of the body depending on the stage of exercise.
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