CrossTalk opposing view: Bradycardia in the trained athlete is attributable to a downregulation of a pacemaker channel in the sinus node - D'Souza, A.; Sharma, S.; Boyett, M. R. (The Journal of Physiology, 2015)
Keywords: heart; frequency; heart rate; variability; training; load; load intensity; theory; heart rate variability; USA; biological and medical sciences