Figure 2. Positive correlation between autonomic balance and changes in the nondipolar components of ventricular repolarization (T-wave residua, TWR) during emotional stress tasks: The effect of emotional stress tasks on LF/HF ratio (abscissa) and on ventricular repolarization (TWR) (ordinate) for all emotional tasks in all subjects (n = 42). Repolarization was assessed using (A) the relative T-wave residua (TWR), (B) T-wave residua to peak T (TWR-P), and (C) T-wave residua from peak T to end T (TWR-T end). A positive correlation was obtained for all three repolarization parameters, with TWR increasing with increasing LF/HF ratio.