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It goes up.
The interval between two occurences is TIME.
During exercise an increase in heart rate corresponds to a shortening of the cardiac cycle (RR interval decreases). Most of this shortening occurs in the TP interval. The QT interval also shortens, but only slightly. then the interval shortens as the heart rate increases.
There are no mixed numbers between 0 and 2 with an interval of 18.
Time22;48