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Recovery action potentials (APs). First single AP (open green circle), last AP in train (open blue circle), and recovery APs for peak amplitude (A), maximum repolarization (B), maximum rate-of-rise (C), 40% decay (D), and 80% decay (E) at 20 Hz (left), 40 Hz (middle), and 60 Hz (right) with recovery APs fitted with an exponential equation. Recovery was not analyzed for AP parameters that did not significantly change during a train in the within-group comparison. WT, wild type.
