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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.