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Figure 1 The sinus cycle length (SCL), maximal normalized sinus node recovery time (SNRT)/SCL ratio and Wenckebach cycle (WC) and anterograde (Ant) effective refractory period (ERP) of the atrioventricular node at baseline, after atropine and after propranolol in endurance-trained athletes (solid circles) and untrained individuals (solid squares). Data are presented as the mean value ± SD. *Significant (p < 0.05) differences between athletes and untrained individuals.  Significantly different (p < 0.05) from previous pharmacologic intervention.
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