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Table 3 Heart rate and total cardiac cycle duration

From: WEB downloadable software for training in cardiovascular hemodynamics in the (3-D) stress echo lab

HR b.p.m 50 60 70 80 90 100 110 120 130 140 150 160 170 180
Cardiac cycle length (msec) 1200 1000 857 750 666 600 545 500 463 429 400 375 353 333
  1. The total cardiac cycle duration is algebraically dependent on the heart rate [= 60,000 msec/heart rate] with fixed values totally independent from the increasing heart rate stress type. However, at each heart rate the fixed total cardiac cycle time can be differently divided between systole and diastole. At fixed heart rates the diastolic time fraction is determined by factors that modulate systolic duration through modulation of myocyte contraction.