Duration of diastole and its phases as a function of heart rate during supine bicycle exercise

American Journal of Physiology. Heart and Circulatory Physiology
Charles S ChungSándor J Kovács

Abstract

The duration of diastole can be defined in terms of mechanical events. Mechanical diastolic duration (MDD) is comprised by the phases of early rapid filling (E wave), diastasis, and late atrial filling (A wave). The effect of heart rate (HR) on diastolic duration is predictable from kinematic modeling and known cellular physiology. To determine the dependence of MDD of each phase and the velocity time integral (VTI) on HR, simultaneous transmitral Doppler flow velocities and ECG were recorded during supine bicycle exercise in healthy volunteers. Durations, peak values, and VTI using triangular approximation for E- and A-wave shape were measured. MDD, defined as the interval from the start of the E wave to end of the A wave, was fit as an algebraic function of HR by MDD=BMDD + MLMDD.HR + MIMDD/HR, derivable from first principles, where BMDD is a constant, and MLMDD and MIMDD are the constant coefficients of the linear and inverse HR dependent terms. Excellent correlation was observed (r2=0.98). E- and A-wave durations were found to be very nearly independent of HR: 100% increase in HR generated only an 18% decrease in E-wave duration and 16% decrease in A-wave duration. VTI was similarly very nearly independent of HR. Diastasis ...Continue Reading

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Citations

Jun 30, 2010·European Radiology·Robert GoettiSebastian Leschka
Oct 13, 2009·European Journal of Applied Physiology·Keith P GeorgeDaniel J Green
Nov 9, 2011·Annals of Biomedical Engineering·Sina Mossahebi, Sándor J Kovács
Mar 30, 2010·Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology·Eraldo OcchettaPaolo Marino
Oct 17, 2008·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Christoforos D GiannakiKeith George
Nov 16, 2010·Cardiovascular Ultrasound·Tonino BombardiniEugenio Picano
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Sep 4, 2015·The International Journal of Cardiovascular Imaging·Csilla CelengBrian Ghoshhajra
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