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All rights reserved. Dallas, TX 75231 is published by the American Heart Association, 7272 Greenville Avenue, Circulation: Cardiovascular Imaging doi: 10.1161/CIRCIMAGING
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Kinetics of Left Ventricular Strains and Torsion During Incremental Exercise in Healthy Subjects The Key Role of Torsional Mechanics for Systolic-Diastolic Coupling Gre´gory Doucende, MS; Iris Schuster, MD, PhD; Thomas Rupp, PhD; Aliona Startun, MD; Michel Dauzat, MD, PhD; Philippe Obert, PhD; Ste´phane Nottin, PhD Background—The dynamics of systolic and diastolic strains and torsional mechanics of the left ventricle (LV) and their relation to diastolic filling never have been evaluated at various exercise intensities. Methods and Results—Speckle tracking echocardiography was performed in 20 healthy sedentary subjects at rest and during a progressive submaximal exercise test at 20%, 30%, and 40% of maximal aerobic power. LV twist increased progressively with exercise intensity (10.53.2 to 15.84.5°; P0.001), whereas longitudinal strain remained unchanged after the first workload, underlining the key role of torsional reserve in systolic-diastolic coupling during exercise. The increase in diastolic untwisting (88.734.2 to 182.953.5 deg s ; P0.01) was correlated to enhanced systolic twist (R0.61; P0.001), and its magnitude of increase was significantly higher compared to diastolic longitudinal and circumferential strain rates (11964% versus 6544% and 5724%, respectively), emphasizing its contribution to diastolic filling. The timing of peak untwisting and the chronology of diastolic mechanical events were unchanged
Circulation: Cardiovascular Imaging – Wolters Kluwer Health
Published: Sep 1, 2010
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