it is well known that athletes have a resting sinus bradycardia—their resting heart rate can be half the normal value ([7][1])— and this is normally attributed to high vagal tone… Click to show full abstract
it is well known that athletes have a resting sinus bradycardia—their resting heart rate can be half the normal value ([7][1])— and this is normally attributed to high vagal tone ([3][2]). This is a logical assumption, because we have known since 1921 from the work of the physiologist Otto Loewi
               
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