I am a 55 year old man with a pacemaker.  I started running 8 months ago and my resting heart rate has gone down to about 52.  My cardiologist even lowered the threshhold rate of my pacemaker from 60 to 50.  Is it OK that my resting rate went down after only 8 months of running (about 15-20 miles per week at 9 minutes per mile pace)?
Midair it's a generalized procedure to keep the thresh hold limit to a lower side ... a bit lower side , 50 is mild bradycardia and actual peacemaking is required if heart rate further Chat Doctor.