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European Journal of Echocardiography 2003 4(4):286-291; doi:10.1016/S1525-2167(03)00008-8
© 2003 by European Society of Cardiology
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Copyright © 2003, The European Society of Cardiology

Left Ventricular Mechanics During Exercise: A Doppler and Tissue Doppler Study

A. Stoylen, U. Wisløff and S. Slørdahl

Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway

Received 16 October 2002; received in revised form 20 January 2003; accepted after revision 23 January 2003.


  Abstract

Aims: To study left ventricular mechanics of exercise with Doppler and tissue Doppler.

Methods and Results: Twenty-one males (mean age, 26; height, 184 cm; weight, 84 kg), exercised on a bicycle, with increasing workload, with oxygen uptake, Doppler flow and tissue Doppler recordings during exercise. There was correlation between peak systolic LVOT flow and annulus velocity; R=0.72, (p<0.001) and between peak mitral E flow and annulus Ea velocity; R=0.68(p<0.001). Finally there was correlation between peak LVOT and mitral flow velocity; R=0.83(p<0.001) and peak systolic and early diastolic annulus velocity R=0.69(p<0.001). All intervals of the heart cycle decreased with RR-interval. There was a linear relation between diastolic filling and RR-interval, while ejection period was less increased with RR-intervals above 600 ms, and thus not a linear relationship. There was no change in E/Ea ratio during exercise.

Conclusions: Mechanism for increased filling as well as ejection during exercise seems to be increased contraction and relaxation velocity, with no evidence of Frank–Starling mechanism. Bazett's formula gives a better heart rate correction of LVET at high heart rates than Weissler's.

Keywords: exercise echo; Doppler echocardiography; tissue Doppler; time intervals


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