Abstract 1722: Radial Contribution to the Total Stroke Volume in Male and Female Athletes Compared to Healthy Control Subjects
Introduction: Previous work has shown that radial contribution of total stroke volume (TSVrad) explains the major part of total heart volume variation (THVV), Fig A⇓. Therefore, by measuring THVV, TSVrad can be estimated.
Objective: To investigate to what extent the radial component (TSVrad) contributes to the TSV in male and female athletes and healthy controls and to see if there were any differences between sexes and between athletes and controls.
Methods: Twenty-four athletes (soccer players, 12 female) and 24 gender and age matched controls underwent cardiac MRI. Total stroke volume (TSV) was calculated as the sum of right and left ventricular stroke volumes. To assess the TSVrad, THVV was measured using cine MR short-axis images.
Results: The radial component was 31 ± 11% vs. 27 ± 10 % in male athletes and controls respectively; and 32 ± 10 % vs. 23 ± 6 % in female athletes and controls respectively (Fig B⇓). The contribution of TSV rad was significantly larger only in female athletes when compared to female controls (p = 0.01). There were no differences between males and females at similar fitness level.
Conclusion: This study indicates that physiologically enlarged hearts in athletes may have a slightly different mode of ventricular pumping compared to controls. This may increase our understanding of pumping in the pathologically enlarged hearts. Fig A⇓: The heart contours in end-diastole (ED, solid lines) and in end-systole (ES, broken lines). The striped area shows the longitudinal contribution to the TSV (TSVlong) caused by the AV-plane movement. The dotted area shows the THVV and the TSVrad. Fig B⇓: The contribution of the radial component of the total stroke volume (TSVrad).