i think running is actually bad for one's heart

Yeah just make up a buncha numbers, why not?

Just a word about something I haven’t seen here. With a background of running liesurely and competitively with hundreds of road races an a dozen marathons at age 84 I had tavr stents implanted and after a few months a couple mini strokes followed by implant of pacemaker. My cardiologist and surgeon said it was running that made me a good candidate for the pm. He and a panel of docs not only supported my idea to continue jogging and treadmill if—pretty much to my hearts content. They were unanimous that “movement is life,” and was more than ok for me. Combined with moderate taiji, heart healthy diet, reading and raising kitties, I could continue for a while. My example is no proof but a vote for keeping alive by keeping your heart active as much as you reasonably can. It’s another thing to to stay alive for and enjoy caring for.

pernicious nonsense

My hypothesis is this marathon heart-scarring thing is caused not by overexertion, but fuel depletion. Unlike skeletal muscle, which has the option of bonking and slogging the last few kilometers, the heart has to keep on going, even if it's about skint of glucose and has to run on fatty acids and ketones. Maybe it's a bad idea to put it through that.

Mark Sisson (former world class Marathoner and Triathlete explains this in detail:

marksdailyapple.com

Chronic Cardio is Still Unhealthy

Mark Sisson

It's becoming clearer than ever that chronic cardio is bad for your health. Read about the recent research showing how excessive endurance training harms you.

Link:www.marksdailyapple.com/the-evidence-c...

In a nutshell: hunter/gatherer hardly ever did long distance running. They walked a lot and they sprinted when they had to.

Jogging leads to inflammation, heart disease etc.

You need to read different news articles. Far more people benefit from moderate cardiovascular exercise than those that remain sedentary. Running is a good activity to achieve this.

The key word in your answer is “moderate”.

How many of the letsrun fraternity, who are performance orientated run “moderate” mileage, with “moderate” effort.

We’d first have to define what moderate is. I suspect that the definition would vary amongst many on here.

When James O’Keefe and other cardiologists came out and said that exercise was good, but too much exercise, perhaps not, in 2012, it caused seismic tremors in the industry. Livelihoods were threatened! Of course there was going to be a backlash. Can you imagine the loss of revenue if people cut back their running to 20 miles a week or less?! Millions, probably billions would have been lost. I’d love to know who funded the studies that looked for the counter argument to O’Keefe. I have my suspicions. The thing is ( and why I am prone to believe him) O’Keefe wasn’t selling anything. Just providing a common sense opinion. IF, as is commonly stated, exercise is medicine, then why wouldn’t you pay attention to the dosage, as you would with any other medicine. The uproar from the running media however! You’d think that he had shot their mothers. The noise from those who could see their bank balances shrinking was deafening.

Chronic dehydration is probably bad for the heart. Summers in the US are extreme for most runners.

Some elite runners gets very old and some not. It's already written in the sky when your day will come. Running has saved more people to live longer and healthy than the other way around.And the best thing running gives more quality to your overall life existence.