If heart rate increases, which phase of the cardiac cycle is decreased?

Name: If heart rate increases, which phase of the cardiac cycle is decreased?
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[Chapter 3, V; Figure 3.15]. When heart rate increases, the time between ventricular contractions (for refilling of the ventricles with blood) decreases. Because most ventricular filling occurs during the "reduced" phase, this phase is the most compromised by an increase in heart rate.

If Heart Rate Increases, Which Phase of the Cardiac Cycle