Previous studies on ECG recorded under exercise conditions on sedentary and athlete subjects lead to following results: 1) the subjects can be characterized according to their training level studying the PR slope in the early recovery phase, and 2) it exists a non-linear relationship between PR and RR intervals which exhibits a clockwise hysteresis shape when data from exercise and its recovery are compared. The main drawback of these studies is that they were performed on a small size data set. As the understanding of the PR-RR hysteresis phenomenon may lead to improvement of pacemaker's design, the aim of this study is to check the PR-RR hysteresis on a larger data set.
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