The researchers found that male athletes with an exercise volume of >3,000 MET-minutes/week showed higher mean coronary artery calcification (CAC) scores than nonathlete males (mean difference = 31.62). No difference in CAC was found for male athletes with 1,500 to 3,000 MET-minutes/week or female athletes with an exercise volume of 1,500 MET-minutes/week or greater.
Not sure what a MET minute is, but 3000 minutes per week is 7 hours per day, seven days a week. So, this sounds like a problem for approximately zero percent of the population.
Tennis is a 5MET activity, jogging/running can be 10+
Pace of 9 minute per mile is ~12 Mets/M
So maybe doing 30miles a week at that pace = 30Miles * 9 Min * 12 Mets/Min = 3000 Met/Mins/Wk
Ok, so say a four miles/day routine. High, but actually attainable for mortals.
My cardiologist told me I was doing too much cardio and I shouldn’t do more than an hour a day.
For the vast majority of the population, more exercise is better. But there is an upper limit to the cardiovascular benefits of exercise.
Chatgpt says it would be on the order of 8 hours of running a week. So similar to many marathon training routines.