Why the study?
How does the isovolumetric contraction time change with increasing heart rate due to exercise?
How does the isovolumetric contraction time change with increasing heart rate due to exercise?
Echocardiography confirms the theoretical prediction that isovolumetric contraction time decreases disproportionately with increasing heart rate during exercise.
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May necessitate heart rate-adjusted echocardiographic norms during exercise; leaves open clinical impact on systolic function assessment.
The isovolumetric contraction time of the human heart, i.e. the time interval from the completion of the mitral valve closure to the beginning of the aortic valve opening was measured by means of echocardiography. The result of this investigation verifies a theoretical prediction by the author, that the isovolumetric contraction time should decrease more than in proportion with the heart period when the heart rate increases due to exercise, and that it should even disappear at a sufficiently elevated heart rate.
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H. Lauboeck (1980) studied this question.
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