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Figure 5 Stroke volume, ejection fraction (EF), ratio of left ventricular (LV) to right ventricular (RV) stroke volume (ratio stroke volume LV/RV), and ratio of LV-EF to RV-EF (ratio EF LV/RV) in endurance athletes (A) and untrained control subjects (C). Data are expressed as the mean value ± SD. Error bars represent 95% confidence intervals. **p < 0.01 and ***p < 0.001 (paired t test).