Low heart rate and lack of running progress

I have run on an off for 35 yrs and have noticed when returning to running in last 6 mths after 5 yrs on "power" walking, actually just fast walking ie 14 - 15 min pace,, my normal HR is 30 to 40 so when I go out to jog I start walking fast and Hr gets to 60 to maybe 75. When I start to jog I have a natural pace of app 8 min, but I can't maintain that for more than 1/2 mile without slowing down and walking. I've tried to train through this, on/off walk jog of varring distances and pace for 6wks now, rarely I can make a contious 9 min mile then it's back to walk jog for remainder of my 4 to 5 mile routes,,, I find I can't run slow enough to run continuously without getting out of breath, my HR at the time I have to walk is about 125 - 130,, it just seems like after yrs of cardio my heart won't react to the traing effect anymore,, it's getting frustrating,, but with all that said I'm happy to be out there, any one else have any similar experiences, I've recently read about bradycardia ???
 
Sorry, I'm confused about your issue. (Probably the wording.) Is it that you're just having trouble with maintaining even a slow running pace? If that's the issue, just slow down even more. Even if you have to go at a speed on par with walking, try to at least maintain a running motion.

Unless you're having actual medical issues with you heart, I wouldn't worry about bradycardia. Many people have higher or lower natural heart rates. In active people, the heart will often become trained to beat more slowly due to an increase in the size of the heart muscle (which results in increased blood pumped per beat).
 
You have a very low heart rate which means you likely have a very large heart, which is able to pump a very large volume of blood per beat. If that is what you were born with, not the result of something abnormal (disease, drug or environmental) that happened, then that is actually good because your heart works less and should last a long time.
Remember running is one of the most difficult and therefore most effective exercises there is, and the one the human body was designed for. Current theory is that the first humans survived by literally running their four legged prey to exhaustion in the heat of the African plains, and that humans evolved to run upright and be hairless because that was the most efficient mode for cooling and running long distances in heat.
You didn't say how often you were running, but like you I have run off and on for many decades and found that after 55, I needed a lot more recovery time between running sessions. I found that at least 2 days rest was required to prevent injury and provide maximum improvement. I live in the cold north and don't like running in the cold, so I am restarting every spring. I find that I must start with a short distance (1/2 mile) and increase the distance very gradually (like 1/4 mile) each week, and as stated earlier only run 2 days a week with at least 2 days rest between sessions. Old age sucks, but it sucks worse if you sit on the couch and rot, so get out there and do it, but be smart about it and you can improve gradually. Remember life is a marathon not a sprint.
 
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