Abstract 13268: Global and Regional Circumferential and Radial Myocardial Deformation and Torsion in Elite High School Athletes - Physiologic Impact of High Intensity Athletic Training on Ventricular Adaptation&Performance
Background: Cardiac adaptation to high intensity athletic training is characterized by increases in LV chamber dimension, wall thickness & mass. Previously, we identified regional differences in longitudinal LV myocardial strain in elite high school athletes compared to sedentary controls, most notably with increases in apical relative to basal myocardial deformation. The purpose of this study was to assess the physiologic impact of long-term training & the type of sport participation on parameters of LV radial & circumferential deformation as well as LV torsion in this same cohort.
Methods: Standard two-dimensional (2D), spectral Doppler, & tissue Doppler were prospectively performed utilizing a GE Vivid 7 system to evaluate LV systolic function in 107 elite high school athletes (68 males) compared to controls. Radial and circumferential strain were performed to evaluate 18 regional (apical, mid, & basal short-axis segments) & global LV strain. The impact of the type of sport and training (figure skating, ice hockey, soccer) on LV systolic deformation was also assessed.
Results: Heart rate, LV dimensions, & LV mass were significantly different in athletes compared to controls (p<0.001). Traditional measures of LV systolic & diastolic function as well as tissue Doppler, global circumferential 2D strain, & averaged radial 2D strain were not different between groups. Similar to previously identified changes in longitudinal strain, regional differences in both radial & circumferential strain were identified, with apical deformation increased relative to basal function in athletes compared to controls (p<0.001). LV torsion was decreased in athletes versus controls (p<0.01). Similar changes in regional deformation & torsion were seen in all athletes.
Conclusions: Regionally increased apical deformation compared to basal function was a consistent finding demonstrated in all athletic groups for all components of myocardial deformation. These findings, in addition to an overall decrease in LV myocardial torsion in elite athletes, add novel insights into the physiologic basis of augmented regional contractile reserve seen with high intensity training & may also assist in distinguishing athletic from myopathic increases in LV mass.
- © 2012 by American Heart Association, Inc.