Comment on

• Point: Exercise training-induced bradycardia is caused by changes in intrinsic sinus node function.

  Boyett MR, Wang Y, Nakao S, Ariyaratnam J, Hart G, Monfredi O, D'Souza A. Boyett MR, et al. J Appl Physiol (1985). 2017 Sep 1;123(3):684-685. doi: 10.1152/japplphysiol.00604.2017. Epub 2017 Jul 6. J Appl Physiol (1985). 2017. PMID: 28684593 Free PMC article. No abstract available.
• Counterpoint: Exercise training-induced bradycardia: the case for enhanced parasympathetic regulation.

  Billman GE. Billman GE. J Appl Physiol (1985). 2017 Sep 1;123(3):686-688. doi: 10.1152/japplphysiol.00605.2017. Epub 2017 Jul 6. J Appl Physiol (1985). 2017. PMID: 28684594 No abstract available.
• Point:Counterpoint.

  Flannery D, Howden EJ, La Gerche A, Hughson RL, Leicht AS, Boullosa DA, Hautala AJ, Zuo L, He F. Flannery D, et al. J Appl Physiol (1985). 2017 Sep 1;123(3):692-693. doi: 10.1152/japplphysiol.00546.2017. J Appl Physiol (1985). 2017. PMID: 28947627 No abstract available.